Institute of Applied Research

Sukurta: 11 September 2013

tmi 9 Saulėtekio, LT-10222 Vilnius
Tel. / fax 236 6059
E-mail:
www http://www.tmi.vu.lt

Director – Prof. Habil. Dr. Artūras Žukauskas
Prof. Habil. Dr. Saulius Antanas Juršėnas (since December 18, 2012)

STAFF

42 research fellows (7 habilitated doctors and 21 doctors)

Departament of Advanced Technologies
Department of New Materials Research and Measurement Technology
Department of Semiconductor Optoelectronics
Liquid Crystals Laboratory

MAIN RESEARCH AREAS OF THE INSTITUTE

Semiconductor physics, electronics and optoelectronics
Laser physics and light technologies
New materials, nano-structures and surfaces: synthesis, characterization, technologies
Informatics and technologies of information society

DOCTORAL DISSERTATIONS MAINTAINED IN 2012

M. Pranaitis. Study of carrier transport, trapping and optical nonlinearities in polymers promising for optoelectronic applications.
A. Uleckas. Contactless spectroscopy of native and technological defects in Si, Ge, and GaN structures.
S. Nargelas. Investigation of carrier dynamics in InN, InGaN, and GaAsBi by optical pump-probe techniques.

DEPARTMENT OF ADVANCED TECHNOLOGIES

10 Saulėtekio, LT-10223 Vilnius
Tel. 236 6069
E-mail:

Head – Dr. Roland Tomašiūnas

DIVISION OF MATERIALS ENGINEERING

10 Saulėtekio, LT-10223 Vilnius
Tel. 236 6099
E-mail:

Head – Dr. Vytautas Grivickas

STAFF

Chief research fellow: Dr. R. Tomašiūnas.
Senior research fellow: Dr. V. Grivickas.
Research fellow: Dr. V. Bikbajevas (part-time).
Junior research fellows: E. Jelmakas, I. Reklaitis, K. Gulbinas, M. Skapas (all part -time).
Doctoral students: E. Jelmakas, K. Gulbinas, I. Reklaitis, M. Skapas.
Post-doc: Dr. T. Grinys, Dr. T. Malinauskas.
Senior engineer: G. Medeišienė (part-time).
Engineer: G. Seniutinas (all part-time).
Technician: R. Beresnienė (part time).

RESEARCH INTERESTS

GaN technology
Optical nonlinearities of nano-structures (InGaAs, GaN)
Non-linear optical properties and mobility of organic molecules in polymers
Optical studies of carrier transport and recombination of silicon carbide and of layered semiconductors and their nanostructures

RESEARCH PROJECTS CARRIED OUT IN 2012

Projects Supported by the University Budget

Development of Materials, Structures and Devices for Topical Semiconductor Optoelectronics. Prof. K. Jarašiūnas, Prof. S. Juršėnas, Dr. R. Tomašiūnas. 2011–2014.

GaN, InGaN, AlGaN multilayers and nanostructures were grown by MOCVD technology and investigated by microscopy (SEM), XRD, optical (spectroscopy, luminescence, non-linear optical methods) and electrical (mobility) techniques. Second and third order non-linear optical properties (II and III harmonic generation) of materials with noncentrosymmetry (dendrimers, phenylcarbazoles) were investigated. Layered TlGaSe2 and GaSe crystals and 6H-SiC structures were investigated by means of conventional and transient free-carrier absorption spectroscopy, photoacoustic deflection method.

Projects Supported by the Lithuanian Research Council

Femtosecond Digital Holography for Nonlinear Processes Investigation in Group III Nitride Compounds (FEDI). Dr. V. Kudriasov. 2011–2012.

In cooperation with Vilnius University Laser Centre.
This project aims at investigating nonlinear material response and nonlinear propagation of intense femtosecond radiation in InGaN and AlGaN single layer compounds with different bad-gap by employing a digital holographic microscope with very high temporal (tens of fs) and high spatial resolution (<1 mm).

Growth of Single-Layer Ingan and Study its Optical Resistance with Ultrashort Laser Pulses (SIGNALAS). Dr. A. Melninkaitis. 2011–2012.

In cooperation with Vilnius University Laser Centre.
Development of new femtosecond laser etching technology for binary gallium nitride (GaN) and ternary indium gallium nitride (InGaN) layers is the main task of the project. GaN and InGaN thin films single layers on sapphire substrate having different doping levels and band gaps by applying MOCVD technology were produced. Electrical and physical properties (such as thickness, refraction index, crystalline structure) of the materials were characterized.

Creation and Investigation of Azo Chromophore Functionalised Gan Surfaces (AZOGAN). Dr. R. Tomašiūnas. 2012–2014.

Main goal of the project is to investigate new hybrid functional material – gallium nitride surface modified by azochromophore. The project expects to get and investigate a new effect – photostimulated optical orientation of azo chromophores influenced by gallium nitride surface. Vilnius university group in WP2 grew GaN on sapphire samples by metaloorganic chemical vapour deposition, which afterwards have been hydroxylated. A test to connect azochromophore to the hydroxylated GaN surface was performed. In parallel optical poling experiments performed on a related guest-host system of azophenylcarbazoles revealed a decreased relaxation rate and re-orientation capabilities for poled molecules in the related system.

Projects Supported by theAgency for International Science and Technology Development Programmes in Lithuania

Towards Functional Sub-Wavelength Photonic Structures. Dr. R. Tomašiūnas.COST MP0702. Management Committee Member. 2008–2012.

The task was synthesis and investigation of new materials featuring all-optical poling (WG2). The project was successfully closed with the final meeting in January.

International Science Programmes and Projects

FP7 Collaborative Project: Compact Ultrafast Laser Sources Based on Novel Quantum Dot Structures FAST DOT. Dr. R. Tomašiūnas. 2008–2012.

The project is targeting at new generation of quantum dot based lasers for use in Biophotonics applications. Being compact and efficient these lasers will improve the performance of procedures such as precision cutting and imaging. Aim of the work is to investigate fast carrier dynamics in several quantum dot SESAM structures via measuring spectral and time resolved recovery of photoinduced absorption bleaching.

FP7 Collaborative Project: Nanostructured Efficient White Leds Based on Short-Period Superlattices and Quantum Dots NEWLED. Dr. R. Tomašiūnas. 2012–2016.

The project will develop high efficiency and high brightness monolithic and hybrid all- semiconductor WHITE light-emitting GaN-based diodes. Power losses due to phosphor conversion and the problem of different ageing rates of the GaN LED pump will be eliminated by the development of phosphor free structures with increased brightness. Project will enhance the efficiency of yellow InGaAlP/AlGaAs LEDs by bandgap engineered superlattices. Novel light extraction approaches will target advanced directionality and colour adjustment. Advanced packaging will enable effective heat dissipation and light management.

Swedish Visby Program

Preparation and Characterization of Suspended Nanosheets of Layered Semiconductor Materials. Dr. V. Grivickas, Prof. J. Linnros, Dr. A. Fedotov. 2010–2013.
Optical absorption, defect investigation, photoacoustic responces in GaSe, InSe, TlGaSe2 and other layered semiconductors. Nanosheets membranes suspended on different substrates and structures.

Lithuanian-Belarus Program

Characterization of Suspended Nanosheets of Layered Semiconductors by Photoinduced Absorption and Photoconductivity Relaxation Techniques. Dr. V. Grivickas, A. Odrinski. 2011–2012.

Nordic Energy Research Program

High Efficiency Integerated Solar Energy Converter HEISEC. Dr. T. Malinauskas. 2012–2014.

Main idea of the project is to combine photovoltaic and thermionic effects (PETE) into single high efficiency device. To demonstrate and verify the phenomenon of PETE and study the means to optimize material properties as well as to build a working demonstrator that can be utilized in further research and development. Ultimately the project aims for new solar energy converter technology demonstration including structure, materials and assessment.

COOPERATION

Belarus State University (Belarus)
Vitebsk Photoacoustic Institute (Belarus)
Royal Institute of Technology (Sweden)
TUBITAK Marmara Research Center (Turkey)
Angers University (France)
University of Dundee (Scotland)
Rygas Technical University (Latvia)
Swinburne University (Australia)
Center for Physical Sciences and Technology (Lithuania)
Kaunas University of Technology (Lithuania)

OTHER SCIENTIFIC ACTIVITIES

Dr. V.Grivickas –

vicepresident of the Lithuanian Materials Research Society (LtMRS), www.ltmrs.lt/members/v_grivickas/.

Dr. R. Tomašiūnas –

member of Vilnius University Doctoral Committee Materials Engineering (08T);
member of the Technical Committee 73 Nanotechnologies of the Lithuanian Standards Board;
member of the Lithuanian Material Research Society.

Dr. V. Bikbajevas –

member of the Lithuanian Material Research Society.

DIVISION OF INFORMATION TECHNOLOGY

29 M. K. Čiurlionio, LT-03100 Vilnius
Tel. 265 1797, fax 233 5648
E-mail:

Head – Dr. Arūnas Samuilis

STAFF

Senior research fellow: Dr. A. Samuilis (part time).
Research fellow: Dr. A. Konstantinov (part-time).
Senior engineers: V. Dadurkevičius, D. Ralys, J. Vaičiulis (all part-time).

RESEARCH INTERESTS

Artificial intelligence in various Lithuanian language computer implementations: e. g. machine translation, intelligent dictionaries
The development of the dictionary of the contemporary Lithuanian

RESEARCH PROJECTS CARRIED OUT IN 2012

During the last three years the research of possibilities of the improvement of the machine translation quality has been carried out under the guidance of Dr. A. Samuilis. In 2011 the project The Development of the English-Lithuanian-English and French-Lithuanian-French Machine Translation Systems Based on Statistical Methods has been prepared and presented to the Central Project Management Agency (CPVA). The initial language resources necessary for statistical machine translation have been accumulated.

Projects Supported by University Budget

Research of Possibilities of Applying the Semantic and Ontological Information in Computer Dictionaries. Dr. A. Samuilis. 2010–2012.

The usability of the coverage of the dictionary of the contemporary Lithuanian for the search systems has been investigated in 2012.

DIVISION OF LIGHTING AND ELECTRONICS SYSTEMS

9 Saulėtekio, LT-10222 Vilnius
Tel. 236 6039
E-mail:

Head – Dr. Pranciškus Vitta

STAFF

Research fellows: Dr. P. Vitta, Dr. A. Novičkovas.
Junior research fellow: A. Tuzikas.
Doctoral students: A. Tuzikas, D. Meškauskas.
Master and Bachelor students: A. Tuzikas, A. Petrulis, A. Zabiliūtė, L. Dabašinskas, P. Eidikas, J. Trimailovas, Ž. Živulskas, L. Jacunskas (all part-time).

RESEARCH INTERESTS

Characterization, optimization and applications of light-emitting diodes and their systems
Lighting systems with advanced color properties for general lighting
Lighting systems for improved nutritional quality vegetable growth
Intelligent solid-state lighting systems for outdoor lighting-

RESEARCH PROJECTS CARRIED OUT IN 2012

Projects Supported by University Budget

Characterization of Advanced Light-Emitting Diodes for Solid State Lighting and Measurement Technologies. Prof. A. Žukauskas. 2008–2012.

The aim of the research is to develop the electrical, optical and thermal characterization techniques of the advanced light-emitting diodes (LEDs). The obtained results are applied for design of modern solid-state light sources (luminaries) as well as for measurement techniques.

National program Energetics of the Future

Mesopic Solid-State Light Sources (MesoLED). Prof. A. Žukauskas. 2012–2014.

The Project MesoLED is devoted to the novel energy-saving technology of outdoor lighting. The Project aims at the optimization of solid-state light sources in respect of mesopic eye sensitivity and at the development of such sources. The developed LED clusters will be used for the establishing of the limits of known mesopic vision models by the investigation of reaction time and contrast and colour discrimination.

The program of Scientist group initiative

Conserving and Smart Lighting Technology for Art Display. (TIMKAT). Dr. R. Vaicekauskas. 2012–2014.

In cooperation with the Faculty of Mathematics and Informatics, Vilnius University.
Solid-state sources of light offer new possibilities for art display. The spectral power distribution of semiconductor light-emitting diodes (LEDs) is restricted (does not contain ultraviolet and infrared components) and has conserving impact on paint pigments and other materials. In addition, the use of smart computer-driven clusters of white and coloured LEDs allows for controlling colour temperature and colour rendering quality of light source and simulating different lighting conditions (dim, bright, artificial and natural light) in order to saturate colours that are faded due to the pigment aging and to individually adjust visual appearance of the artwork.

High Technology Development Program (Agency for Science, Innovation and Technology)
Optimization of Electrical, Optical and Thermal Characteristics of Solid-State Street Luminaire. (TERRALED). Dr. P. Vitta. 2011–2013.

In cooperation with Terra Lucida Ltd..
The main objective of the project is to design and optimize a prototype product line, consisting of LED based dimmable luminaires with custom optical and electrical specifications adapted for particular application areas such as extra-urban roads, streets, pedestrian/cyclist pathways and parking places.
Publication and patents of 2012:
A. Žukauskas, R Vaicekauskas, P. Vitta, A. Tuzikas, A. Petrulis, and M. Shur " Colour rendition engine," Opt. Exp. 20 (5), pp. 5356-5367 (2012).
P Vitta, I Reklaitis and A Žukauskas "Frequency-domain fluorometry in the presence of high in-phase background," Meas. Sci. Technol. 23 (3), 035502 (2012).
A. Žukauskas, P. Duchovskis, Z. Bliznikas, G. Samuolienė, A. Urbonavičiūtė, and P. Vitta, “Method and apparatus for the reduction of harmful nitrates in plants using radiant flux generated by a solid-state illuminator,” EP2111097(B1) (2012).

DIVISION OF BIOMEDICAL TECHNOLOGY

9 Saulėtekio, LT-10222 Vilnius
E-mail:
Head – Doc. Dr. Aurelija Vaitkuvienė

STAFF

Chief research fellow: Habil. Dr. Ž. Lukšienė.
Senior research fellow: Doc. Dr. A.Vaitkuvienė.
Junior research fellows: I. Buchovec, V. Gėgžna, I. Reklaitis, R. Lukšaitė.
Engineers: D.Varanius, V. Gėgžna, K. Kairyte.
Doctoral students: D. Varanius, V. Gėgžna.

RESEARCH INTERESTS

Application of light in life sciences
Biomedical optics: fundamental, applications, clinical investigation
Food safety and quality: development of novel non-thermal antimicrobial technologies
Bio photonic technologies for organic agriculture and food safety and quality: inactivation of pathogenic and harmful micro organisms
New materials in optical medicine; photodynamic therapy, photo diagnostics
Imaging and spectroscopy of bio-medical, biological objects: obstetrics, gynecology, reproduction, oncology, neurosurgery, immunology, biomaterials

RESEARCH PROJECTS CARRIED OUT IN 2012

Projects Supported by University Budget

Biomedical Materials Optical Investigation. Doc. A. Vaitkuvienė, Prof. O. Rukšėnas.

Projects on Medical Photodiagnostics and Phototherapy. Doc. Dr. A.Vaitkuviene.

A search for new partners and technologies.
Collaboration with a private company “Patologijos diagnostika” Ltd. (PD) was extended: an agreement on scientific collaboration between Vilnius University (VU) and PD in the field of photodiagnostics was extended and a mutual project called Research on Human Invertebrate Disc and Liquid Cervical Smear Samples Autoflorescecnce was submitted to Agency for Science, Innovation and Technology (MITA), won the competition and will be funded in 2013 (tool “Inočekiai LT”).
Private company “LASERCOM” Ltd. signed an agreement for scientific collaboration and for funding of scientific research.
Collaboration with the Department of Spectroscopy of the Faculty of Physics of VU was established: Raman spectroscopy measurements were performed on our biomedical samples, methodology was elaborated.
Collaboration with other universities (e.g., Lund University, Sweden) and a company “Standa” Ltd. was established for application of advanced optical methods in biomedical diagnostics.
A project called Clinical Research on Application of Spectroscopic and Electrochemical Methods for Diagnostics was prepared and submitted for the competition organized by the Lithuanian Research Council.

Awards for Accomplished Researches. Doc. A. Vaitkuviene, V. Gėgžna.

Master thesis Research on Diagnostics of Medical Conditions in Cervix and Endometrium Using the Fluorescence of Their Washings and Scrapings written by V. Gėgžna (supervisor A. Vaitkuvienė, research accomplished at the Institute of Applied Research of VU and Malmo City Hospital (Sweden)) was awarded with 2nd prize in competition organized by he Ministry of Economy of the Republic of Lithuania and the association “Knowledge Economy Forum” for innovative and economically perspective ideas.

Food Preservation and Decontamination Technology projects. Prof. Ž. Lukšienė.

New project Modern Antibacterial Technology Development was launched in 2012.

VU/ECCA Uterus Cancer Prevention project. Doc. Dr. A. Vaitkuvienė.

European Cervical Cancer Assotiation Project on European Cervical cancer prevention week arrangement. In January–March, 2012, VU representative at ECCA Doc. Dr. A.Vaitkuvienė organized the program of CervicalCcancer Prevention Week: ECCA, Vilnius University in collaboration with Lithuanian Association of Obstetricians and Gynaecologists, Infectious Diseases and AIDS Centre organized courses in Vilnius, Kaunas (in September, in Panevezys) with the presentations delivered by ECCA Secretary General P. Davis, ECCA communication officer S.Bagdoniene. The social event – discussion with the officers of the Ministry of Health was held involving media representatives - Vilnius regional TV, newspaper journalists, women and students’ organizations. The social involvement was achieved by spreading of HPV related brochures at massive winter sport event “Snaige”, theatre “Zana D’Ark” performance in Kaunas “Lėlių” Theatre, St Jhons’ Church community.

COOPERATION

Lund University, Malmo Clinic (Sweden)
European Cervical Cancer Association
Lithuanian Association of Obstetricians and Gynaecologists (Lithuania)
Baltic Association for Laser Medicine
International Academy of Laser Medicine and Surgery (IALMS), Florence (Italy)
SCANBALT- Life sciences on top of Europe- regional network in Baltic Sea region, innovation promotion flagship project Health Port
International Women’s Organization Soroptimist International
STANDA Ltd. (Lithuania)
Patologijos diagnostika Ltd. (Lithuania)
Czech Technical University, Prague (Czech Republic)
Laser Medicine Institute (Italy)
Uniform Service University of Health Science, Dept. Anatomy, Physiology and Genetics, Bethesda (USA)
Aleksandras Stulginskis University (Lithuania)
Lithuaniam Agriculture and Foresrtry Sciences Centre (Lithuania)
Forth Photonics Hellas SA Athens (Greece)
Forth Photonics, Livingston (United Kingdom)
Radium Hospital, Institute for Cancer Research (Norway)
Turku University (Finland)
University of Latvia, Riga (Latvia)

OTHER SCIENTIFIC ACTIVITIES

Doc. A. Vaitkuvienė –

founding member, scientific committee member of the International Academy of Laser Medicine and Surgery, www.ialms.org;
President elect for 5th Congress of the International Photo Therapy Association in Vilnius, 2013, http://www.jmll.co.jp/ipta/committee.htm;
representative of Vilnius University at the European Cervical Cancer Association, www.ecca.info;
ECCA representative for European Cervical cancer prevention week in Lithuania. ECCA expert in Lithuania;
board member of the Lithuanian Association of Laser Medicine;
member of the Lithuanian Association of Obstetricians and Gynaecologists; chair of Colposcopy section.

Prof. Ž. Lukšienė –

member of the European Society for Photobiology;
expert of the Lithuanian Research Council;
member of the Lithuanian Society for Biochemistry;
expert of the European Commission FP6;
associated member of the international forum Photobiophysics;
editorial board member of the journal Research and Reviews in BioSciences;
rewiever of journals Cancer Letters; Journal of Cellular and Molecular Medicine; International Journal of Radiation Biology; Chemosphere; Acta Medica Lithuanica; Food Research International; EUREKOS;
expert of the Europe Food Safety Administration.

MAIN PUBLICATIONS of the Department of Advanced Technologies

Parts of the Books

V. Grivickas, J. Linnros. Carrier Lifetime: Free Carrier Absorption, Photoconductivity, and Photoluminescence. Characterization of Materials : second edition. New York : John Wiley and Sons, Inc. [36 p.].

Articles

P. Vitta, L. Dabašinskas, A. Tuzikas, A. Petrulis, D. Meškauskas, A. Žukauskas. Concept of Intelligent Solid-State Street Lighting Technology // Elektronika ir elektrotechnika / Kauno technologijos universitetas. Kaunas : Technologija. 2012, vol. 18, nr. 10, p. 37-40.

K. Kairytė, Ž. Lukšienė, M. Pučetaitė, V. Šablinskas. Differentiation of bacterial strains by means of surface enhanced FT-Raman spectroscopy // Lithuanian Journal of Physics / Lithuanian Physical Society, Lithuanian Academy of Science. Vilnius : Lietuvos mokslų akademijos leidykla. 2012, Vol. 52, no. 3, p. 276-283.

I. Buchovec, R. Kokštaitė, Ž. Lukšienė, V. Pamedytytė, R. Makuška. Antimicrobial efficiency of photoactivated chlorophyllin-chitosan complex // Cheminė technologija / Kauno technologijos universitetas. Kaunas : Technologija. 2012, nr. 3, p. 54-57.

G. Seniutinas, R. Tomašiūnas, R. Czaplicki, B. Sahraoui, M. Daškevičienė, V. Getautis, Z. Balevičius. Arylmethylene-1,3-indandione based molecular glasses: Third order optical non-linearity // Dyes and pigments. Oxford : Elsevier Science LTD. 2012, Vol. 95, no. 1, p. 33-40.

V. Gavriušinas. Asymmetric double quantum wells with smoothed interfaces // Central European journal of physics. Warsaw : Versita. 2012, vol. 10, no. 2, p. 459-469.

A. Vaitkuvienė, V. Gėgžna, R. Kurtinaitienė, J. Vaitkus. Cervical Smear Photodiagnosis by Fluorescence // Photomedicine and Laser Surgery. New Rochelle : Mary Ann Liebert, Inc. Publishers. 2012, Vol. 30, no. 5, p. 268-274.

C. Baristiran-Kaynak, M. Lukosius, B. Tillack, C. Wenger, A. Abrutis, M. Skapas. CexAlyOz/TiN stack analysis for Metal-Insulator-Metal applications: Effect of annealing and the metal electrode deposition method // Thin solid films. Lausanne : Elsevier Science. 2012, vol. 520, no. 14, p. 4518-4522.

A. Žukauskas, R. Vaicekauskas, P. Vitta, A. Tuzikas, A. Petrulis, M. Shur. Color rendition engine // Optics express. Washington : Optical Society of America. 2012, vol. 20, no. 5, p. 5356-5367.

Z. Vaitonis, A. Stonkus, A. Žukauskas. Effect of junction temperature oscillation on output characteristics of a light-emitting diode under pulse-width and pulse-frequency modulation driving modes // IET Optoelectronics. Hertford : The Institution of Engineering and Technology. 2012, Vol. 6, iss. 1, p. 52-56.

M. Usman, A. Hallen, K. Gulbinas, V. Grivickas. Effect of Nuclear Scattering Damage at SiO2/SiC and Al2O3/SiC Interfaces - a Radiation Hardness Study of Dielectrics // Materials science forum. Stafa-Zurich : Trans Tech Publications. 2012, Vol. 717-720 : Silicon Carbide and Related Materials 2011, p. 805-808.

K. Kairytė, S. Lapinskas, V. Gudelis, Ž. Lukšienė. Effective inactivation of food pathogens Listeria monocytogenes and Salmonella enterica by combined treatment of hypericin-based photosensitization and high power pulsed light // Journal of applied microbiology. Oxford : Wiley-Blackwell Publishing Ltd. 2012, Vol. 112, no. 6, p. 1144-1151.

A. Fedotov, M. Tarasik, T. Mammadov, I. Svito, P. Zhukowski, T. Koltunowicz, M. Seyidov, R. Suleymanov, V. Grivickas, V. Bikbajevas. Electrical properties of the layered single crystals TlGaSe2 and TlInS2 // Przeglad Elektrotechniczny (Electrical Review). Warsaw : Wydawnictwo SIGMA - NOT Sp. z o.o. 2012, Vol. 88, no. 7a, p. 301-304.

M. Syvajarvi, J. Muller, J. Sun, V. Grivickas, Y. Ou, V. Jokubavičius, P. Hens, M. Kaisr, K. Ariyawong, K. Gulbinas, P. Hens, R. Liljedahl, M. Linnarsson, S. Kamiyama, P. Wellmann, E. Spiecker, H. Ou. Fluorescent SiC as a new material for white LEDs // Physica scripta. Bristol : Institute of Physics Publishing Ltd. 2012, vol. T148, art. no. 014002(5 p.).

Ž. Lukšienė, I. Buchovec, K. Kairytė, E. Paškevičiūtė, P. Viškelis. High-power pulsed light for microbial decontamination of some fruits and vegetables with different surfaces // Journal of Food, Agriculture and Environment. Helsinki : World Food RD Ltd. 2012, Vol. 10, no. 3-4, p. 162-167.

P. Malinovskis, A. Mekys, A. Kadys, T. Malinauskas, T. Grinys, V. Bikbajevas, R. Tomašiūnas, J. Storasta, P. Malinovskis, P. Malinovskis, A. Mekys, A. Mekys, J. Storasta. Peculiarities of galvanomagnetic effects in GaN epilayers and GaN/InGaN quantum wells // Physica status solidi C : Current topics in solid state physics. Weinheim : WILEY-VCH Verlag GmbH & Co. 2012, Vol. 9, iss. 3-4, p. 689-692.

G. Seniutinas, T. Malinauskas, R. Tomašiūnas, R. Petruškevičius, I. Petrikytė, V. Getautis. Photoinduced Optical Functionalism of Branched Azophenylcarbazoles in Molecular Glass Matrices // Molecular crystals and liquid crystals. Abingdon : Taylor & Francis. 2012, vol. 556, iss. 1 : Special Issue: Proceedings of the 11th International Conference on Frontiers of Polymers and Advanced Materials (ICFPAM2011), p. 124-134.

G. Navickaitė, G. Seniutinas, R. Tomašiūnas, R. Petruškevičius, V. Getautis, M. Daškevičienė. Photoinduced orientational dynamics of azophenylcarbazole molecules in polycarbonate // Dyes and pigments. Oxford : Elsevier Science LTD. 2011, vol. 92, no. 3, p. 1204-1211.

Z. Bliznikas, A. Žukauskas, G. Samuolienė, A. Viršilė, A. Brazaitytė, J. Jankauskienė, P. Duchovskis, A. Novičkovas. Effect of supplementary pre-harvest LED lighting on the antioxidant properties of green vegetables // Acta Horticulturae. Leuven : International Society for Horticultural Science. 2012, vol. 939, p. 85-91.

A. Novičkovas, A. Brazaitytė, P. Duchovskis, J. Jankauskienė, G. Samuolienė, A. Viršilė, R. Sirtautas, Z. Bliznikas, A. Žukauskas. Solid-State Lamps (LEDs) for the Short-Wavelength Supplementary Lighting in Greenhouses: Experimental Results with Cucumber // Acta Horticulturae. Leuven : International Society for Horticultural Science. 2012, vol. 927 : XXVIII International Horticultural Congress on Science and Horticulture for People (IHC2010): International Symposium on Greenhouse 2010 and Soilless Cultivation. ISBN 97890605741. p. 723-730.

G. Samuolienė, A. Brazaitytė, R. Sirtautas, S. Sakalauskienė, J. Jankauskienė, P. Duchovskis, A. Novičkovas. The impact of supplementary short-term red LED lighting on the antioxidant properties of microgreens // Acta Horticulturae. Leuven : International Society for Horticultural Science. 2012, Vol. 956 : Proceedings of the VIIth International Symposium on Light in Horticultural Systems, Wageningen, The Netherlands, October 14-18, 2012. ISBN 9789066055452. p. 649-655.

Materials of conferences

T. Malinauskas, A. Kadys, T. Grinys, S. Nargelas, R. Aleksiejūnas, S. Miasojedovas, J. Mickevičius, R. Tomašiūnas, K. Jarašiūnas, M. Vengris, S. Okur, V. Avrutin, X. Li, F. Zhang, U. Ozgur, H. MorkoĆ§. Impact of carrier localization, recombination, and diffusivity on excited state dynamics in InGaN/GaN quantum wells // Proceedings of SPIE. Bellingham : SPIE. 2012, vol. 8262 : Gallium Nitride Materials and Devices VII / editors: Jen-Inn Chyi, Yasushi Nanishi, Hadis MorkoĆ§, Joachim Piprek, Euijoon Yoon. ISBN 9780819489050. p. 82621S (10 p.).

M. Ščiuka, M. Dmukauskas, T. Grinys, A. Melninkaitis. Optical resistance of GaN and InGaN thin films // Proceedings of SPIE. Bellingham : SPIE. 2012, Vol. 8530 : Laser-Induced Damage in Optical Materials: Boulder, Colorado, USA, September 23, 2012 / edited by Gregory J. Exarhos, Vitaly E. Gruzdev, Joseph A. Menapace, Detlev Ristau, M J Soileau. p. 85300Y(10 p.).

Patents

A. Žukauskas, P. Duchovskis, Z. Bliznikas, G. Samuolienė, A. Urbonavičiūtė, P. Vitta. Method and apparatus for the reduction of harmful nitrates in plants using radiant flux generated by a solid-state illuminator // European Patent No EP 2111097 B1, patvirtinimo data 20120523.

DEPARTMENT OF NEW MATERIALS RESEARCH AND MEASUREMENT TECHNOLOGY

9 Saulėtekio, LT-10222 Vilnius
Tel.: 236 6082, 268 7015, fax 236 6003
E-mail:

Head – Habil. Dr. Eugenijus Gaubas

STAFF

Chief research fellows: Habil. Dr. E. Gaubas, Prof. Habil. Dr. J. V. Vaitkus (part-time), Prof. Habil. Dr. V. Kažukauskas (part-time).
Senior research fellows: Dr. S. Tamošiūnas (part-time), Dr. J. Storasta (part time).
Research fellows: Dr. A. Mekys (part-time), Dr. R. Pūras, Dr. E. Žąsinas (part-time), Dr. T. Čeponis, Dr. A. Uleckas.
Post-doc: Dr. V. Kalendra.
Doctoral students: T. Čeponis, A. Uleckas, M. Pranaitis, A. Tekorius, V. Rumbauskas, J. Pavlov.
Junior research fellow: M. Pranaitis.
Engineers: J. Pavlov, A. Tekorius, J. Kusakovskij, A. Velička, D. Bajarūnas, D. Meškauskaitė, N. Vainorius, A. Sakavičius, A. Ziminskij, V. Janonis (all part-time).
Trainers: R. Bondzinskas, N. Vainorius, P. Cicėnas.

RESEARCH ACTIVITIES

Investigation of native and ionizing radiation induced defects and micro-inhomogeneities in semiconductors and structures
Carrier transport phenomena in organic materials and solar cell structures
Development of measurement technologies and instrumentation for the in situ characterization of material and device structures under heavy irradiations by hadrons

RESEARCH PROJECTS CARRIED OUT IN 2012

Projects Supported by University Budget

Investigation of Clusters in the Bulk and on the Surface in Semiconductors. Prof. J. V. Vaitkus. 2010–2014.

Investigation of magnetoresistance effect in Si structures. Analysis of temperature dependences of the magnetoresistance mobility and of the cluster role in recombination of free carriers within epitaxial and MCz Si structures. Investigation of spectra of the thermal and photo- ionization of deep traps and free carrier lifetime in MCz, Fz and Cz Si and MOCVD GaN structures.

Projects Supported by the Lithuanian Research Council

Lithuanian Research Council (LSC) project MIP-068/2011: Investigation of Radiation Defects in Silicon Crystals and Pad Detectors for Super-LHC Experiments-2. Prof. Habil. Dr. J. V. Vaitkus. 2012.

LSC project (2011-2012) MIP-054/2011: Development of Technology for the in Situ Control of the Defects Modifications by Irradiations. Habil. Dr. E. Gaubas. 2012.

Projects Supported by the Lithuanian Academy of Science
CMS-CEC project. CMS (Compact Muon Solenoid) Central European Consortium (CEC) project is devoted to optimization of Si materials and sensors for the CERN CMS experiment.

Projects Supported by the Lithuanian Agency of Science, Innovations and Technology

FP7 Project AIDA: Advanced European Infrastructures for Detectors at Accelerators

WP 8.3.2 of the FP7 AIDA project. Design, fabrication and testing of the radiation monitoring equipment based on the measurements of carrier lifetime implemented by microwave response registration.

International Science Programmes, Projects and Contracts

CERN RD39 Collaboration program: Cryogenic Tracking Detectors.Dr. J.Harkonen (Finland) and Dr. Zh. Li (USA).Vilnius group project Free Carrier Lifetime in Irradiated Si. Prof. Habil. Dr. J. V. Vaitkus, Habil. Dr. E. Gaubas. 2002–2014.

Study of the radiation hardness of Si material and device structures by microwave probed photoconductivity transients, pulsed capacitance and carrier drift induced current measurements. In situ measurements at facilities of Helsinki University and of the Institute of Physics LR tandem-type proton accelerators during irradiation of Si and GaN materials by 1.5–9 MeV protons.

CERN RD50 Collaboration program RadiationHard Semiconductor Devices for Very High Luminosity Colliders. Dr. M. Moll. Contribution to the program Materials Characterization (Prof. M. Bruzzi) 2002–2014 and Defect Engineering (WODEAN project, Prof. G. Lindstrom). Prof. Habil. Dr. J. V. Vaitkus. 2002–2012.

Analysis of radiation defect parameters by means of extrinsic photoconductivity spectra analysis, by thermally stimulated current and lifetime dependence on the hadron irradiation fluences. Peculiarities of cluster–type defects formation and their impact on electrical characteristics on radiation detectors. Simulation of deep trap spectra ascribed to extended radiation defects. Combined investigation of current, capacitance and photoconductivity transients in heavily irradiated material and detector structures.

FP7 project AIDA according to consortium Grant Agreement No. 262025: Advanced European Infrastructures for Detectors at Accelerators.

Vilnius University task (WP 8.3.2) in the AIDA project is a design, fabrication and testing of the radiation monitoring equipment based on the measurements of carrier lifetime implemented by microwave response registration. This technique is chosen for realization of the alternative method for radiation monitoring in CERN. The parameters of carrier recombination ant trapping in differently irradiated samples including a mixture of different leptons, hadrons and photons are studied in order to resolve different defects and change the electrical conductivity compensation which could crucially modify operational characteristics of particle detectors made of silicon material of different growth technology and containing various densities of doping. The performed investigations include the analysis of evolution of radiation defects and their transforms during the irradiation and in the post-irradiated materials. The calibrated characteristics of carrier recombination lifetime are important not only for the AIDA project, but also for RD50 “Radiation hard semiconductor devices for very high luminosity colliders” and for CMS sensor group Central European Consortium program.

Collaboration project according to a bilateral agreement Vilnius University and Division of Materials Physics, Department of Physics, University of Helsinki, Finland. Habil. Dr. E. Gaubas. 2009–2012.

Collaboration project according to a bilateral agreement Vilnius University and Centre of Physical and Technological Sciences, Lithuania. Habil. Dr. E. Gaubas. 2010–2012.

Collaboration project according to the bilateral agreement with the Laboratory of Optical Properties of Materials and their Application (Laboratoire POMA) Angers University, Angers, France. Prof. Habil. Dr. V. Kažukauskas.

Bilateral Lithuania – Byelorussia Collaboration Program supported by Lithuanian science council TAP-25/2011. Prof. J. V. Vaitkus. 2011–2012.

MAIN PUBLICATIONS

E. Gaubas, T. Čeponis, A. Jasiūnas, A. Uleckas, J. Vaitkus, G. Cortina, O. Militaru. Correlated evolution of barrier capacitance charging, generation, and drift currents and of carrier lifetime in Si structures during 25 MeV neutrons irradiation // Applied physics letters. Melville: American Institute of Physics. 2012, vol. 101, iss. 23, Art. no. 232104(3 p.).

V. Kažukauskas, V. Kalendra, N. Vainorius, C. Bumby, B. Ludbrook, A. Kaiser. Electrical Properties of Composites of Polystyrene and Multi-Walled Carbon Nanotubes // Molecular crystals and liquid crystals. Abingdon : Taylor & Francis. 2012, vol. 556, iss. 1 : Special Issue: Proceedings of the 11th International Conference on Frontiers of Polymers and Advanced Materials (ICFPAM2011), p. 158-167.

M. Pranaitis, V. Kažukauskas. Energy Distribution of Trapping and Transport States in MDMO-PPV ([poly-(2-methoxyl, 5-(3,77dimethyloctyloxy)] Para Phenylenevinylene) // Journal of nanoscience and nanotechnology. Valencia : American Scientific Publishers. 2012, Vol. 12, no. 6, p. 4717-4723.

R. Vasiliauskas, A. Mekys, P. Malinovskis, S. Juillaguet, M. Syvajarvi, J. Storasta, R. Yakimova. Impact of extended defects on Hall and magnetoresistivity effects in cubic silicon carbide // Journal of physics D: applied physics. Bristol : Institute of Physics Publishing Ltd. 2012, Vol. 45, no. 22, Art. no. 225102(8 p.).

R. Vasiliauskas, A. Mekys, P. Malinovskis, M. Syvajarvi, J. Storasta, R. Yakimova. Influence of twin boundary orientation on magnetoresistivity effect in free standing 3C-SiC // Materials letters. Amsterdam : Elsevier Science BV. 2012, vol. 74, p. 203-205.

R. Blinc, P. Cevc, G. Tavcar, B. Žemva, V. Laguta, Z. Trontelj, M. Jagodič, D. Pajic, A. Balčytis, J. Scott. Magnetism in multiferroic Pb5Cr3F19 // Physical review. B. Woodbury : American Physical Society. 2012, Vol. 85, iss. 5, Art. no. 054419(5 p.).

V. Kažukauskas, M. Pranaitis. Non-Homogeneity of Distribution of Transport and Trapping States in Poly [2-methoxy-5-(3 ,7 -dimethyloctyloxy)-1,4-phenylenevinylene] // Journal of nanoscience and nanotechnology. Valencia : American Scientific Publishers. 2012, Vol. 12, no. 8, p. 6769-6773.

E. Gaubas, T. Čeponis, A. Uleckas, R. Grigonis. Room temperature spectroscopy of deep levels in junction structures using barrier capacitance charging current transients // Journal of instrumentation. Bristol : IOP Publishing Ltd. 2011, Vol. 6, p. art. no P01003 (1-9).

E. Gaubas, I. Brytavskyi, T. Čeponis, V. Kalendra, A. Tekorius. Spectroscopy of Deep Traps in Cu2S-CdS Junction Structures // Metarials. Basel : MDPI AG. 2012, Vol. 5, iss. 12, p. 2597-2608.

A. Orliukas, T. Šalkus, A. Kežionis, A. Dindune, Z. Kanepe, J. Ronis, V. Venckutė, V. Kazlauskienė, J. Miškinis, A. Lukauskas. Structure and broadband impedance spectroscopy of Li1.3AlyYx-yTi1.7(PO4)3 (x = 0.3; y = 0.1, 0.2) solid electrolyte ceramics // Solid state ionics. Amsterdam : Elsevier Science BV. 2012, Vol. 225 : Proceedings of the 18th International Conference on Solid State Ionics Warsaw, Poland, July 3 -8, 2011. p. 620-625.

E. Gaubas, V. Kalendra, T. Čeponis, A. Uleckas, A. Tekorius, J. Vaitkus, A. Velička. Study of deep level characteristics in the neutrons irradiated Si structures by combining pulsed and steady-state spectroscopy techniques // Journal of instrumentation. Bristol : IOP Publishing Ltd. 2012, Vol. 7, Art. no. C11006 (6 p.).

E. Gaubas, A. Uleckas, J. Rafi, J. Chen, D. Yang, J. Vanhellemont. Study of irradiation induced changes of electrical and functional characteristics in Ge doped Si diodes // Physica B: Condensed Matter. Amsterdam : Elsevier BV. 2012, vol. 407, iss. p. 2998-3001.

G. Tamulaitis, D. Dobrovolskas, J. Mickevičius, V. Kazlauskienė, J. Miškinis, E. Kuokštis, P. Onufrijevs, A. Medvids, J. Huang, C. Chen, C. Liao, C. Yang. Suppression of defect-related luminescence in laser-annealed InGaN epilayers // Physica status solidi C : Current topics in solid state physics. Weinheim : WILEY-VCH Verlag GmbH & Co. 2012, Vol. 9, iss. 3-4, p. 1021-1023.

V. Kažukauskas, M. Pranaitis, A. Sakavičius, O. Krupka, F. Kajzar, B. Sahraoui. Temperature Dependence of the Bistable Photoconductivity of Thin DNA: PEDOT Films // Molecular crystals and liquid crystals. Abingdon : Taylor & Francis. 2012, vol. 554, iss. 1 : Special Issue: Proceedings of the 11th International Conference on Frontiers of Polymers and Advanced Materials (ICFPAM2011), p. 83-94.

E. Gaubas, T. Čeponis, V. Kalendra, J. Kusakovskij, A. Uleckas. Technique applied to Si solar cells and irradiated pin diodes // ISRN materials science. New York : Hindawi Publishing Corporation. 2012, vol. 2012, p. art. ID 543790.

COOPERATION

International cooperation partners: a net of partners is created by CERN RD39 and RD50. collaboration programmes include more than 50 institutions in 19 countries (Europe, Israel, Russia, USA and Canada), the main partners are Glasgow Universities (UK), Hamburg University (Germany), Helsinki University (Finland), Concern UMICORE – Brussels- Olen / Gent University/IMEC - cooperation in research of Ge (Belgium) Interuniversity MicroElectronics Center (IMEC) – cooperation within investigation of the ultrathin structures for nanoelectronics, Leuven (Belgium)
National industry partners: ELMIKA, Ltd., Vilniaus Ventos Puslaidininkiai-VVP, Ltd, STANDA, Ltd (Lithuania)

OTHER SCIENTIFIC ACTIVITIES

Prof. J. V. Vaitkus –

chairman of the Division of Physics of the Lithuanian Academy of Sciences;
fellow of the Institute of Physics (UK);
president of the Lithuanian Physical Society (Lithuania);
vice-chairman of CERN RD50 collaboration board,
member of CERN RD39 collaboration board;
deputy-editor of the Lithuanian Journal of Physics, and member of the international advisory board;
member of the Council of European Physical Society and general assembly of the IUPAP;
editorial board member of the journal Material Science (Medžiagotyra);
member of the Lithuanian Materials Research Society;
international advisory board member of the journal Physical Surface Engineering (Ukraine);
steering committee member of ROC-Lithuania-Latvia Foundation;
advisor to the Committee of Professional Qualification, European Physical Society;
Vilnius University Team leader in CERN RD50, RD39 collaborations and CMS sensor consortium;
member of the board of LITNET;
co-president of 39th Lithuanian National Physics Conference, Vilnius.

Prof. V. Kažukauskas –

expert and project evaluator of German Academic Exchange Service (DAAD);
expert and project evaluator of the Baltic-German University Liaison Office (Baltisch-Deutsches Hochschulkontor);
member of the project selection committee of Georgian Shota Rustaveli National Science Foundation (SRNSF);
expert of the Lithuanian Research Council;
expert, project evaluator and lecturer of Goethe Institute;
committee member of the International Workshop on Advanced Materials for Photonics and Energy Conversion Applications (IWAMPECA) Marrakech, Morocco;
member of the international program committeeand invited lecturer of the international workshop Relaxed, Nonlinear and Acoustic Optical Processes and Materials”, Lutsk, Ukraine;
member of European and Lithuanian Physical Societies;
member of the Lithuanian Materials Research Society;
president of Lithuanian DAAD Club (DAAD – German Academic Exchange Service).

Dr. J. Storasta –

member of the Lithuanian Physical Society;
editorial board member of the journal Fizikų žinios (Physicists News);
board chairman of the program LVMSF-ATPP-B-22 Development of Advanced Technological Approaches in Detection of High Energy Radiations and Engineering of the Radiation Defects.

Habil. Dr. E. Gaubas –

collaboration projects with Gent University and IMEC (Belgium);
board vice-chairman of the program LVMSF-ATPP-B-22 Development of Advanced Technological Approaches in Detection of High Energy Radiations and Engineering of the Radiation Defects;
Vilnius University deputy team leader in CERN RD50, RD39 collaborations and CMS sensor consortium.

Dr. S. Tamošiūnas –

member of the Council at Institute of Applied Research, Vilnius University;
director of the advanced scholars’ school Fizikos Olimpas.

DEPARTMENT OF SEMICONDUCTOR OPTOELECTRONICS

9 Saulėtekio, LT-10222 Vilnius
Tel. 236 6036, fax 236 6037
E-mail:

Head – Prof. Habil. Dr. Kęstutis Jarašiūnas (since September 2012)
Prof. Habil. Dr. Saulius Antanas Juršėnas

Division of Optical Diagnostics
Head – Prof. Habil. Dr. Kęstutis Jarašiūnas
Division of Luminescence
Head – Prof. Habil. Dr. Saulius Antanas Juršėnas
Dr. Karolis Kazlauskas (since September 2012)

STAFF

Chief research fellows: Prof. Habil. Dr. K. Jarašiūnas, Prof. Habil. Dr. S. A. Juršėnas, Prof. Habil. Dr. G. Tamulaitis (part-time), Prof. Habil. Dr. A. Žukauskas (part-time), Prof. Habil. Dr. E. Kuokštis (part-time).
Senior research fellows: Dr. R. Aleksiejūnas (part-time), Dr. K. Kazlauskas.
Research fellows: Dr. V. Gudelis (part-time), Dr. S. Miasojedovas (part-time), Dr. J. Mickevicius (part-time), Dr. T. Malinauskas (part-time).
Junior research fellows: A. Miasojedovas, D. Dobrovolskas, L. Skardžiūtė, (all part-time).
Senior engineer: L. Bastienė (part-time).
Engineers: S. Nargelas, P. Ščajev, M. Karaliūnas, K. Simonas, V. Jakštas, S. Krotkus, A. Tuzikas, A. Stonkus, T. Serevičius, G. Statkutė, S. Raišys, (all part-time),
Doctoral students: S. Nargelas, P. Ščajev, D. Dobrovolskas, D. Ševčenko, M. Karaliūnas, A. Miasojedovas, L. Skardžiūtė, T. Serevičius, G. Statkutė, A. Tuzikas.
Post-doc: Dr. S. Miasojedovas.

RESEARCH INTERESTS

Nonequilibrium carrier relaxation, transport, and related photoelectrical phenomena in highly excited semiconductors and their nanostructures
Development of organic optoelectronics materials and technologies
Laser-based spectroscopic techniques for characterization of novel semiconductor materials for optoelectronics
Optical nonlinearities in semiconductors
Applications of solid state lighting
Fluorescence recognition systems
Characterisation of organic and inorganic luminophores
Photophysical properties of organic electronics materials
Formation of OLED, and organic sensor systems

RESEARCH PROJECTS CARRIED OUT IN 2012

Projects Supported by University Budget

Developmenet of Materials, Structures, and Devices for Semiconductor Optoelectronics. Prof. Habil. Dr. K. Jarašiūnas, Prof. Habil. Dr. S. A. Juršėnas, Dr. R. Tomašiūnas. 2011–2014.

The Project aims at the development of growth technologies of materials promissing for semiconductor optoelectronics, primarily of III-nitride nanostructures. The research facilities and techniqies will be elaborated for characterization of new materials and devices. Interdiciplinary research will be used for optimization of growth technologies and fabrication of device prototypes for solid state lighting, solar cells, sensors, etc. In this way, advanced technologies for growth of modern materials and devices structure will emerge in Lithuania.

Characterization of Advanced Light-Emitting Diodes for the Development of Lighting and Measurement Technologies. Prof. Habil. Dr. A. Žukauskas. 2008–2012.

Light-emitting diode (LED) clusters with improved colour saturating ability have been optimized and classification of solid-sate light sources based on colour fidelity, colour saturation, and colour dulling has been developed using an original statistical colour rendition assessment method. A concept design of a UV LED based sensor for real-time bioparticle detection has been proposed. Optical properties of a novel YAG:Ce phosphor with double substitution of Mg-Si for Al for white LED applications have been investigated. A phosphor converted LED for meeting photomorpho-genetic needs of plants has been designed.

Projects Supported by the Lithuanian Research Council

OPERATIONAL PROGRAMME FOR HUMAN RESOURCES DEVELOPMENT FOR 2001-2013.
Priority 3 Strengthening Capacities of Researchers VP1-3.1-ŠMM-07-K Support to Research Activities of Scientists and Other Researcher (Global Grant) VP1-3.1-ŠMM-07-K-02-012
Project title Control of the Photophysical Properties of Multifunctional Molecular Systems. Prof. Habil. Dr. S. A. Juršėnas. 2012–2015.

The main goal of the project is the control and optimization of the physical properties of organic molecular systems capable to perform several functions at once. Most molecular systems under study, such as bipolar charge carrier matrices, fluorescent and phosphorescent emitters with charge transporting groups, emitters for organic lasers and fluorescent sensors etc. are completely new systems, designed and produced by Lithuanian scientists.
This research will deepen understanding on the control of multifunctional organic electronic material properties, increase the capabilities of Lithuanian scientists and technologists in the field of organic optoelectronics and open the ways for wider applications of Lithuania-made multifunctional materials.

Research group project Formation Technology of Fluorescent Organic Nanostructures and their Sensing Applications (FON-Sense)”. Dr. K. Kazlauskas. 2011–2012.

The project is targeted at mastering the formation technology of specific nanostructures - fluorescent organic nanostructures (FONs), in liquid phase and polymer matrix. Nanostructures formed of molecular compounds have attracted exceptional attention mainly because of their potential applications in organic optoelectronic devices, such us organic light emitting diodes, solar cells, transistors and sensors. In the formation process novel compounds functionalized with aryl or nitrile groups are to be used. In spite of being in the initial development stage, the FON’s technology, which is based on the molecular self-assembly, is considered to be cost-effective and very attractive for device application. The mastering of the FON’s technology, controlling of their morphological and optical properties and establishing the relation between these properties and the technological parameters is believed to enable successful application of FONs in fluorescence sensors for detection of water or organic liquid vapors.

Research group project Stimulated Emission in Wide-Band-Gap Algan Heterostructures (PSALGAN). Prof. Habil. Dr. G. Tamulaitis. 2011–2012.

The project is aimed at the study of the influence of the localizing potential fluctuations on the threshold, spectrum, and efficiency of the stimulated emission in AlGaN heterostructures with different aluminum content and geometric parameters, and at revealing the effect of built-in electric field and its screening by nonequilibrium carriers, band gap renormalization at increasing carrier density, nonradiative recombination and its screening, and light scattering by structural defects of AlGaN quantum wells. As a result of the study, recommendations on optimization of technological conditions, which are favourable for higher stimulated emission intensity, will be formulated.

Science, Innovation and Technology agency project Organic Optoelectronic Materials Targeted for Large Scale Synthesis (Org-Lascale). Prof. Habil. Dr. S. A. Juršėnas. 2011–2013.

Project is carried out by a group of scientists and engineers from the Institute of Applied Research and the Department of Solid State Electronics of Vilnius University. The partner of this project is UAB “Tikslioji Sintezė” (Ltd). The main goal of the project “Org-LaScale” is to create new organic materials featuring attractive physical parameters, to optimize their performance basing on structure-properties-functions relations and to develop large-scale synthesis and purification technologies.21 asymmetric anthracene and carbasole derivatives were synthesized and their large-scale synthesis and purification techniques were developed. The asymmetric anthracene and carbasole derivatives were identified and characterized by means of thermal, microscopy, optical and electrical methods. The compounds were found to exhibit high hole mobility of 10-4-10-2 cm2/Vs and tuneable ionization potential in the range of 4.9–5.75 eV. Some derivatives exhibited high luminescence quantum efficiency (of about 60–80%). Spectral and morphological properties resulting from the fixation of asymmetric phenyl ring by carbon and heteroatoms were addressed. New materials were tested in OLED structures. Recommendations for further synthesis of carbasole derivatives are proposed.

Program on Scientific and Techological Cooperation Project between Lithuania and Belorus, Project Investigation of Electronic and Thermal Proceses by Optical Means in CVD Diamonds of Different Morphology. Prof. Habil. Dr. K. Jarašiūnas. 2011–2012.

Project foresees development of nonlinear optical techniqies for investigation of fast electronic properties in CVD diamons at Vilnius University, and adding studies of thermal properties performed in the Institute of Physiccs at Minsk, Belorus.

International Science Programmes and Projects

EU FP7 Marie Curie Initial Training Network Contract Training Network on Functional Interfaces for Silicon Carbide (NetFISiC) No. PITN-GA-2010-264613, 10 partners from EU countries. Prof. Habil. Dr. K. Jarašiūnas. 2011–2014.

The Project aim is to contribute to training of ypung researchers and carry research on SiC based materials, covering growth-characterization and device fabrication technologies. Vilnius team will contribute by applying time-resolved nonlinear optical characterization techniques in a wide temporal, temperature, and excitation range for evaluation of carrier dynamics, especially for the interface and at surface properties of SiC hetero-structures. A feedback to growth specialists to improve and optimize the structure quality is anticipated.

COST action MP0805 Project Novel Gain Materials and Devices Based on III-V-N Compounds. Prof. Habil. Dr. G. Tamulaitis. 2008–2012.

The COST0805 Action focuses on setting up a network of European researchers active in the field of the novel semiconductor III-N-V gain materials also known as dilute nitrides and indium-rich GaInN. Dilute nitrides and indium-rich GaInN allow a wide range of options for band structure engineering, which is expected to lead to novel devices for displays, data storage, transmission, solar cells, photodynamic therapy, surgery, terahertz devices and gas sensors operating in a wavelength range, extending from 0.3 to 3.0 μm. The Action covers material growth and characterisation, theory, device modelling and fabrication.

Program on Mutual Funds for the Scientific Co-operation of the Republic of Lithuania and the Republic of Latvia with the Republic of China (Taiwan): Project Studies on Nitride and Oxide Semiconductor Nanostructures for Energy Technology Applications. Prof. Habil. Dr. E. Kuokštis. 2008–2012.

Growth, characterization, and preliminary applications of novel optoelectronics semiconductor nanostructures, including nitrides and oxides. The characterization by the combination of the conventional and advanced methods includes the understanding of the nanomaterials, electrical and optical properties, as well as basic mechanisms of energy relaxation in nonequilibrium quasiparticle systems. The targeted applications are all related to energy technology.

Program on Mutual Funds for the Scientific Co-operation of the Republic of Lithuania and the Republic of Latvia with the Republic of China (Taiwan): Project One-dimensional Nanostructures of Ternary AlGaN and Metal Doped-Zinc Oxide with Tunable Bandgaps: Growth, Characterization and Optical Properties. Prof. Habil. Dr. K. Jarašiūnas. 2011–2013.

The work is devoted to implementation of composition-size bandgapengineering for growth of novel wide bandgap ternary semiconductor materials for optoelectronic applications. To get materials with tunable optical and electrical properties, versatile characterization of their structural, optical, photoelectrical and electrical processes is required. The Lithuanian team will contribute with nondestructive, laser-assisted time-resolved techniques. Joint investigation of low dimensional structures grown by Taiwan partner already started and delivered to the Taiwan partner.

MAIN PUBLICATIONS

Parts of the Books

G. Tamulaitis. Spatially resolved luminescence spectroscopy. Semiconductor research: experimental techniques / editors: Amalia Patane, Naci Balkan. - Springer series in material science. ISNN 0933-033X. Heidelberg : Springer, 2012, p. 197-222.

Articles

A. Kurilčik, S. Dapkūnienė, G. Kurilčik, P. Duchovskis, A. Urbonavičiūtė, S. Žilinskaitė, A. Žukauskas. Effect of far-red light on the growth of chrysanthemum plantlets in vitro // Sodininkystė ir daržininkystė / Lietuvos sodininkystės ir daržininkystės institutas. Babtai : Lietuvos sodininkystės ir daržininkystės institutas. 2011, t. 30, nr. 3-4, p. 103-108.

P. Ščajev, K. Jarašiūnas, U. Ozgur, H. Morkoc, J. Leach, T. Paskova. Anisotropy of free-carrier absorption and diffusivity in m-plane GaN // Applied physics letters. Melville: American Institute of Physics. 2012, vol. 100, iss. 2, p. Art. no 022112(4 p.).

K. Jarašiūnas, P. Ščajev, T. Malinauskas, M. Kato, E. Ivakin, M. Nesladek, K. Haenen, U. Ozgur, H. Morkoc. Carrier Diffusivity in Highly Excited Bulk SiC, GaN, and Diamond Crystals by Optical Probes // Materials science forum. Stafa-Zurich : Trans Tech Publications. 2012, Vol. 717-720 : Silicon Carbide and Related Materials 2011, p. 309-312.

G. Tamulaitis, J. Mickevičius, D. Dobrovolskas, E. Kuokštis, M. Shur, M. Shatalov, J. Yang, R. Gaska. Carrier dynamics and efficiency droop in AlGaN epilayers with different Al content // Physica status solidi C : Current topics in solid state physics. Weinheim : WILEY-VCH Verlag GmbH & Co. 2012, Vol. 9, iss. 7, p. 1677-1679.

P. Ščajev, K. Jarašiūnas, S. Okur, U. Ozgur, H. Morkoc. Carrier dynamics in bulk GaN // Journal of applied physics. Melville : American Institute of Physics. 2012, vol. 111, no. 2, p. Art. No. 023702(1-4).

P. Ščajev, K. Jarašiūnas, S. Okur, U. Ozgur, H. Morkoc. Carrier dynamics under two- and single-photon excitation in bulk GaN // Physica status solidi. B : Basic solid state physics. Weinheim : WILEY-VCH Verlag GmbH & Co. 2012, vol. 249, iss. 3, p. 503-506.

P. Ščajev, V. Gudelis, K. Jarašiūnas, I. Kisialiou, E. Ivakin, M. Nesladek, K. Haenen. Carrier recombination and diffusivity in microcrystalline CVD-grown and single-crystalline HPHT diamonds // Physica status solidi A. Applications and Materials Science. Weinheim : WILEY-VCH Verlag GmbH & Co. 2012, vol. 209, no. 9, p. 1744-1749.

A. Žukauskas, R. Vaicekauskas, P. Vitta, A. Tuzikas, A. Petrulis, M. Shur. Color rendition engine // Optics express. Washington : Optical Society of America. 2012, vol. 20, no. 5, p. 5356-5367.

A. Žukauskas, R. Vaicekauskas, M. Shur. Color-dulling solid-state cources of light // Optics express. Washington : Optical Society of America. 2012,Vol. 20, no. 9, p. 9755-9762.

A. Miasojedovas, K. Kazlauskas, G. Armonaitė, V. Sivamurugan, S. Valiyaveettil, J. Gražulevičius, S. Juršėnas. Concentration effects on emission of bay-substituted perylene diimide derivatives in a polymer matrix // Dyes and pigments. Oxford : Elsevier Science LTD. 2012, vol. 92, no. 3, p. 1285-1291.

A. Tomkevičienė, G. Puckytė, J. Gražulevičius, K. Kazlauskas, S. Juršėnas, V. Jankauskas. Dimethyldiphenylamino-substituted carbazoles as electronically active molecular materials // Dyes and pigments. Oxford : Elsevier Science LTD. 2012, Vol. 96, no. 2, p. 574-580.

A. Tomkevičienė, G. Puckytė, J. Gražulevičius, M. Degbia, F. Tran-Van, B. Schmaltz, V. Jankauskas, J. Boucle. Diphenylamino-substituted derivatives of 9-phenylcarbazole as glass-forming hole-transporting materials for solid state dye sensitized solar cells // Synthetic metals. Lausanne : Elsevier Science SA. 2012, vol. 162, iss. 23, p. 1997-2004.

V. Buinauskaitė, V. Martynaitis, S. Mangelinckx, G. Kreiza, K. De, A. Šačkus. Facile synthesis of spiro[benzo[e]indole-2,2-piperidine] derivatives and their transformation to novel fluorescent scaffolds // Tetrahedron. Oxford : Pergamon. 2012, vol. 68, iss. 45, p. 9260-9266.

A. Vembris, I. Muzikante, R. Karpicz, G. Sliaužys, A. Miasojedovas, S. Juršėnas, V. Gulbinas. Fluorescence and amplified spontaneous emission of glass forming compounds containing styryl-4H-pyran-4-ylidene fragment // Journal of Luminescence. Amsterdam : Elsevier BV. 2012, vol. 132, no. 9, p. 2421-2426.

P. Vitta, I. Reklaitis, A. Žukauskas. Frequency-domain fluorometry in the presence of high in-phase background // Measurement Science and Technology. Bristol : Institute of Physics Publishing Ltd. 2012, Vol. 23, iss. 3, art. no. 035502(6 p.).

R. Reghu, J. Gražulevičius, J. Simokaitienė, A. Miasojedovas, K. Kazlauskas, S. Juršėnas, P. Data, K. Karon, M. Lapkowski, V. Gaidelis, V. Jankauskas. Glass-Forming Carbazolyl and Phenothiazinyl Tetra Substituted Pyrene Derivatives: Photophysical, Electrochemical, and Photoelectrical Properties // The Journal of Physical Chemistry C: Nanomaterials, Interfaces and Hard Matter. Washington : American Chemical Society. 2012, Vol. 116, no. 30, p. 15878-15887.

N. Šiaulys, V. Kudriašov, T. Stanislauskas, T. Malinauskas, A. Urniežius, A. Melninkaitis. Holographic study of ultrafast optical excitation in GaN film induced by nonlinear propagation of light // Optics letters. Washington : Optical Society of America. 2012, Vol. 37, no. 23, p. 4916-4918.

X. Li, S. Okur, F. Zhang, S. Hafiz, V. Avrutin, U. Ozgur, H. Morkoc, K. Jarašiūnas. Improved quantum efficiency in InGaN light emitting diodes with multi-double-heterostructure active regions // Applied physics letters. Melville: American Institute of Physics. 2012, vol. 101, iss. 4, p. Art. no 041115(4 p.).

J. Mickevičius, G. Tamulaitis, M. Shur, M. Shatalov, J. Yang, R. Gaska. Internal quantum efficiency in AlGaN with strong carrier localization // Applied physics letters. Melville: American Institute of Physics. 2012, vol. 101, iss. 21, Art. no 211902(4 p.).

G. Liaugaudas, G. Davies, K. Suhling, R. Khan, D. Evans. Luminescence lifetimes of neutral nitrogen-vacancy centres in synthetic diamond containing // Journal of physics. Condensed matter. Bristol : Institute of Physics Publishing Ltd. 2012, vol. 24, no. 43, Art. No. 435503 (5 p.).

P. Ščajev, P. Onufrijevs, G. Manolis, M. Karaliūnas, S. Nargelas, N. Jegenyes, J. Lorenzzi, G. Ferro, M. Beshkova, R. Vasiliauskas, M. Syvajarvi, R. Yakimova, M. Kato, K. Jarašiūnas. On Applicability of Time-Resolved Optical Techniques for Characterization of Differently Grown 3C-SiC Crystals and Heterostructures // Materials science forum. Stafa-Zurich : Trans Tech Publications. 2012, vol. 711, p. 159-163.

A. Žukauskas, R. Vaicekauskas, P. Vitta. Optimization of solid-state lamps for photobiologically friendly mesopic lighting // Applied optics. Washington : Optical Society of America. 2012, Vol. 51, no. 35, p. 8423-8432.

J. Mickevičius, J. Jurkevičius, M. Shur, J. Yang, R. Gaska, G. Tamulaitis. Photoluminescence efficiency droop and stimulated recombination in GaN epilayers // Optics express. Washington : Optical Society of America. 2012, Vol. 20, no. 23, p. 25195-25200.

S. Krotkus, K. Kazlauskas, A. Miasojedovas, A. Gruodis, A. Tomkevičienė, J. Gražulevičius, S. Juršėnas. Pyrenyl-Functionalized Fluorene and Carbazole Derivatives as Blue Light Emitters // The Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter. Washington : American Chemical Society. 2012, vol. 116, no. 13, p. 7561-7572.

K. Kazlauskas, A. Miasojedovas, D. Dobrovolskas, E. Arbačiauskienė, V. Getautis, A. Šačkus, S. Juršėnas. Self-assembled nanoparticles of p-phenylenediacetonitrile derivatives with fluorescence turn-on // Journal of Nanoparticle Research. Dordrecht : Springer Netherlands. 2012, Vol. 14, iss. 6, Art. no. 877 (13 p.).

J. Dodonova, L. Skardžiūtė, K. Kazlauskas, S. Juršėnas, S. Tumkevičius. Synthesis of 4-aryl-, 2,4-diaryl- and 2,4,7-triarylpyrrolo[2,3-d]pyrimidines by a combination of the Suzuki cross-coupling and N-arylation reactions // Tetrahedron. Oxford : Pergamon. 2012, vol. 68, iss. 1, p. 329-339.

J. Mickevičius, J. Jurkevičius, K. Kazlauskas, A. Žukauskas, G. Tamulaitis, M. Shur, M. Shatalov, J. Yang, R. Gaska. Stimulated emission due to localized and delocalized carriers in Al0.35Ga0.65N/Al0.49Ga0.51N quantum wells // Applied physics letters. Melville: American Institute of Physics. 2012, vol. 101, iss. 4, p. Art. no 041912(4 p.).

J. Mickevičius, J. Jurkevičius, K. Kazlauskas, A. Žukauskas, G. Tamulaitis, M. Shur, M. Shatalov, R. Gaska. Stimulated emission in AlGaN/AlGaN quantum wells with different Al content // Applied physics letters. Melville: American Institute of Physics. 2012, vol. 100, iss. 8, p. Art. no 081902(4 p.).

D. Gudeika, A. Michalevičiūtė, J. Gražulevičius, R. Lygaitis, S. Grigalevičius, V. Jankauskas, A. Miasojedovas, S. Juršėnas, G. Sini. Structure Properties Relationship of Donor-Acceptor Derivatives of Triphenylamine and 1,8-Naphthalimide // The Journal of Physical Chemistry C: Nanomaterials, Interfaces and Hard Matter. Washington : American Chemical Society. 2012, Vol. 116, no. 28, p. 14811-14819.

A. Vembris, E. Zarins, J. Jubels, V. Kokars, I. Muzikante, A. Miasojedovas, S. Juršėnas. Thermal and optical properties of red luminescent glass forming symmetric and non symmetric styryl-4H-pyran-4-ylidene fragment containing derivatives // Optical materials. Amsterdam, Elsevier Science BV. 2012, Vol. 34, iss. 9, p. 1501-1506.

R. Aleksiejūnas, P. Ščajev, S. Nargelas, S. Miasojedovas, K. Jarašiūnas, L. Trinkler, J. Grigorjeva, B. Berzina, K. Chen, Y. Chen, M. Chen, L. Chen. Carrier dynamics in epilayers and nanocolumns of ternary AlGaN with a tunable bandgap // IOP Conference Series: Materials Science and Engineering. Bristol : Institute of Physics Publishing Ltd. 2012, Vol. 38 : International Conference on Functional Materials and Nanotechnologies (FM&NT2012) 17-20 April 2012, Riga, Latvia. p. 012054(4 p.).

I. Mihailovs, J. Kreicberga, V. Kampars, S. Miasojedovas, S. Juršėnas, L. Skuja, M. Rutkis. Hyper-Rayleigh scattering and two-photon luminescence of phenylamine-indandione chromophores // IOP Conference Series: Materials Science and Engineering. Bristol : Institute of Physics Publishing Ltd. 2012, Vol. 38 : International Conference on Functional Materials and Nanotechnologies (FM&NT2012) 17-20 April 2012, Riga, Latvia. p. 012035 (8 p.).

Materials of conferences

K. Jarašiūnas, P. Ščajev, S. Nargelas, R. Aleksiejūnas, J. Leach, T. Paskova, S. Okur, U. Ozgur, H. MorkoĆ§. Recombination and diffusion processes in polar and nonpolar bulk GaN investigated by time-resolved photoluminescence and nonlinear optical techniques // Proceedings of SPIE. 2012, vol. 8262 : Gallium Nitride Materials and Devices VII / editors: Jen-Inn Chyi, Yasushi Nanishi, Hadis MorkoĆ§, Joachim Piprek, Euijoon Yoon. ISBN 9780819489050. p. 82620G(10 p.).

Patents

COOPERATION

AIXTRON AG (Aachen (Germany)
Linköoping University (Sweden)
Hasselt University (Belgium)
Institute of Solid State Physics, University of Latvia, Riga (Latvia)
Institute of Physics, CPTS, Vilnius (Lithuania)
Stepanov Institute of Physics, Belarus Academy of Sciences, Minsk (Belarus)
Rensselaer Polytechnic Institute, Troy NY (USA)
Sensor Electronic Technology, Inc., Columbia SC (USA)
TDI Company (USA)
Virginia Commonwealth University, Richmond VA (USA)
Institute of Physics (Belorus)
Taiwan National University (Taiwan)

OTHER SCIENTIFIC ACTIVITIES

Prof. A. Žukauskas –

member of the Lithuanian Academy of Sciences;
administrative board member of the Lithuanian Physical Society;
senior member of the IEEE;
member of the Lithuanian Science Award Committee;
presidium member of the Lithuanian Association of Engineering Industry;
member of the board of the Lithuanian Photovoltaic Technology and Business Association;
head of the supervising group of the project Creation of the National Centre for Physical and Technological Sciences;
Vilnius University Rector 2012 Award in Technological Sciences.

Prof. K. Jarašiūnas –

member of the Council at Institute of Applied Research, Vilnius University;
member of the Organizing Committee for International HeteroSiC Workshop;
head of joint Committee for Doctoral Studies in Technological Sciences at Vilnius University;
winner of Baltic-American Freedom Foundation grant (2011–2012).

Prof. G. Tamulaitis –

expert of the Research Council of Lithuania;
member of the Senate of Vilnius University;
member of the Council of the Faculty of Physics, Vilnius University;
member of the Scientific Council of the Centre for Physical Sciences and Technology, Vilnius;
member of the Scientific Council of the Space Science and Technology Institute, Vilnius.

Prof. S. A. Juršėnas –

member of the Senate of Vilnius University;
member of the Council of the Institute of Applied Research;
expert of the Lithuanian State Science and Studies Foundation;
chairman of the Committee for Doctoral studies in Physics (Vilnius University and Centre of Physical Sciences and Technology);
head of the Steering Committee of the National Centre of Physical and Technology Sciences.

Prof. E. Kuokštis –

member of the Science Council of Lithuania (Committee of Natural and Technical Sciences);
member of the Council of Physics Faculty (Vilnius University).

Dr. K. Kazlauskas –

member of the Council of Institute of Applied Research, Vilnius University;
winner of the Young Scientist Fellowship of the Lithuanian Academy of Sciences.

LIQUID CRYSTALS LABORATORY

24 Naugarduko, LT-03225 Vilnius
Tel. 213 5553, fax 216 3417
E-mail:

Head – Doc. Dr. Povilas Adomėnas

STAFF

Senior research fellows: Doc. Dr. P. Adomėnas, Dr. O. Adomėnienė.
Senior engineers: A. Gleiznys, A. Zakšauskas.
Engineers: O. Bobrovas, S. Jevstafiev, V. Kalcas, S.Bikantienė, A. Urbaitis,
A. Voitechovičius, V. Žvinytė, R.Rimkus (part-time).
Technicians: M. Pikaikinas (part-time), A. Žvikas (part-time).

RESEARCH INTERESTS

New synthetic methods for nitrogen and sulphur heterocycles, poly-substituted anthracenes
New compounds and intermediates for OLED-technology
Efficient technologies for photovoltaic and OLED intermediates

MAIN PUBLICATIONS

Articles

S. Tumkevičius, A. Voitechovičius, P. Adomėnas. Synthesis of novel 2,4,6-triarylpyrimidines // Chemija / Lietuvos mokslų akademija. Vilnius : Lietuvos mokslų akademijos leidykla. 2012, t. 23, nr. 1, p. 61-67.

A. Voitechovičius, K. Karpavičius, A. Voitechovičiūtė, S. Tumkevičius, P. Adomėnas. Synthesis of novel 4,6-diaryl- and 4,6-bis(2-arylvinyl)-pyrimidines // Latvian Journal of Chemistry. Salaspils : Institute of Inorganic Chemistry of the Riga Technical University. 2012, no. 1 : Materials of the Paul Walden 7th Symposium on organic chemistry (Riga, September 12-13, 2011), p. 77.

Materials of conferences

M. Burbulienė, O. Bobrovas, P. Vainilavičius. 1-amino-1,2,3,5-tetrahidroimidazo[2,1-a]chinazolin-2,5-diono oksidacijos reakcijos tyrimas // Organinė chemija = Organic chemistry : mokslinės konferencijos pranešimų medžiaga. Kaunas : Technologija, 2012, p. 51.

COOPERATION

JNC Corp. (Japan)
KISCO Ltd. (Japan)
Chukan Butsu Ltd. (Japan)
Cambridge Display Technology Ltd. (UK)
SYNTHON Chemicals GmbH & Co. KG (Germany)
Alfa Aesar Co. (UK)
Acros Organics B.V.B.A. (Belgium)
TCI Europe (Belgium)
Sumitomo Chemical Corp. (Japan)
Niche Materials Ltd. (UK)