About
The group is focused on the investigation of excitation dynamics in systems of organic molecules.
Research topics:
- spectroscopy of organic semiconductor materials and their nanostructures,
- structure-property relations of organic compounds for optoelectronics,
- control of fluorescent organic nanostructure morphology and efficiency,
- control of exciton diffusion in small-molecule compounds,
- efficient blue singlet and thermally-activated delayed flourescence (TADF) emitter development,
- amplified spontaneous emission investigation in amorphous and crystalline layers applied in organic lasers,
- light conversion in amorphous organic layers, organic light-emitting diode (OLED) technologies.
Researchers
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Prof. Saulius Antanas Juršėnas Chief researcher Saulėtekis av. 3, room B230 Phone.: +370 5 223-4480 |
Dr. Karolis Kazlauskas Chief researcher Saulėtekis av. 3, room B217 Phone: +370 5 223-4499 |
Dr. Saulius Miasojedovas Senior Researcher Saulėtekis av. 3, room B224 Phone: +370 5 223-4496 |
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Dr. Patrik Ščajev Senior researcher Saulėtekis av. 3, room B227 Phone: +370 5 223-4493 |
Dr. Tomas Serevičius Senior Researcher Saulėtekis av. 3, room B216 Phone: +370 5 223-4501 |
Dr. Steponas Raišys Senior Researcher Saulėtekis av. 3, room B218 Phone: +370 5 223-4500 |
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Dr. Gediminas Kreiza Senior Researcher Saulėtekis av. 3, room B201 Phone: +370 5 223-4484 |
Dr. Justina Jovaišaitė Researcher Saulėtekis av. 3, room B201 Phone: +370 5 223-4484 |
Dr. Dovydas Banevičius Researcher Saulėtekis av. 3, room B216 Phone: +370 5 223-4501 |
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Dr. Edvinas Radiunas Researcher Saulėtekis av. 3, room B224 Phone: +370 5 223-4496 |
Kamilė Tulaitė PhD student Saulėtekio al. 3, kab. B216 Tel: +370 5 223 4501 |
Manvydas Dapkevičius Engineer Saulėtekio al. 3, kab. B201 Tel.: +370 5 223 4484 |
Facilities
Ultrafast spectroscopy lab
Ultrafast process investigation methods:
- Differential absorption measurement by pump-probe technique. Selective excitation by photons of variable energy, probing with white light continuum.
- Time resolved PL spectroscopy (kinetic fluorimetry).
Equipment:
Laser system:
- Femtosecond KGW:Yb laser PHAROS (6W@30KHz, 200 fs, 1030 nm, Light Conversion);
- 2x optical parametric oscillators Orpheus (630–2500 nm, Light Conversion);
- II-harmonics generator LYRA (Light Conversion);
- Excitation wavelenghts: 310–2500 nm.
Optical pump-probe setup:
- Pump-probe spectrometer HARPIA (Light Conversion);
- Wide spectrum white light continuum probe (380–2600 nm);
- Probe delay of up to 1.5 ns;
- Wide spectrum probe detection in UV-Vis-IR (250-1200 nm) and IR (1100-2600 nm) regions;
- Time-resolved: ~300 fs resolution.
Time-resolved PL spectroscopy setup:
- Photoelectron (streak) camera Hamamatsu C10627;
- PL detection range: 250-900 nm;
- Temporal resolution: ~10 ps. Time-correlated single photon counting module (TCSPC) Pico Harp-300. Liquid nitrogen cryostat for low-temperature measurements (77–300 K).
Head of the laboratory: dr. Paulius Baronas
Photophysical phenomena lab
[foto]
Measurement techniques employed:
- steady-state and time resolved fluorescence;
- delayed fluorescence and phosphorescence spectroscopy in wide range of temperature and delay time;
- fluorescence quantum efficiency.
Equipment:
- iCCD Andor New iStar DH340T camera (spectral range 180-850 nm, temporal resolution: 2.2 ns);
- Nd:YAG picosecond laser Ekspla PL2140 (1054, 532, 355, 266, 213 nm; pulse duration ~25 ps, 10 Hz repetition rate);
- Nd:YAG optical parametric oscillator EKSPLA NT242 (210 – 2600 nm; pulse duration 6 ns, 1 kHz repetition rate);
- Closed-cycle helium cryostat Cryo Industries 204 N (8-350K);
- Multi-channel photonic analyzer Hamamatsu PMA-12 (spectral range 200-950 nm) with an integrating sphere (Sphere Optics).
Head of the laboratory: dr. Tomas Serevičius
Chemical Technology Lab
Methods used:
Preparation of the films and solutions of organic compounds and crystal growth required for optical spectroscopy research. Solutions are prepared by dissolving the compounds in various organic or inorganic solvents at the required concentrations. If necessary, materials are further purified by sublimation in vacuum. The formation of organic films carried out by the following methods: solution-casting, spin-coating, doctor-blade or melt-processing techniques. These forming methods allow the production of samples from tens of nanometers to several centimeters thick. Organic single crystals are grown from the vapor phase in a vacuum or nitrogen atmosphere. The initial characterization of new organic compounds is performed by measuring the light absorption spectra of the compounds, determining the HOMO and LUMO levels by cyclic voltammetry, evaluating the thermal properties of the compounds (glass transition, melting and crystallization temperatures) - by differential scanning calorimetry.
Equipment:
- UV-ozone cleaner NOVASCAN PSDP-UV4T;
- scales SARTORIUS AG CPA26P (weighing range 0.0002-21 g, step value 0.002 mg, repeatability 0.004 mg);
- Laurell WS-650 spin-coater;
- organic material purifier CreaPhys DSU-20;
- cyclic voltammetry device eDAQ Potentiostat 466;
- Mettler Toledo DSC 1 differential scanning calorimetry device;
- UV-VIS-NIR spectrometer Perkin Elmer Lambda 950 with integrating sphere (spectral range 175 - 3300 nm). Absorption, transmittance and reflection measurement modes.
Head of the laboratory: dr. Steponas Raišys
Organic Optoelectronic Technology Lab
Installed technologies:
- functional organic layer deposition by thermal vacuum evaporation and solution-processing by spin-coating in inert atmosphere glovebox;
- metal contacts deposition by thermal vacuum evaporation;
- OLED device encapsulation;
- Evaluation of current-voltage and photometric properties.
Equipment:
- Inert environment GLOVE-BOX system (mBraun) with integrated equipment:
- 8-source organic material vacuum evaporation chamber;
- 4-source metal vacuum evaporation chamber;
- Vacuum substrate transport chamber with an automated manipulator;
- Automatic device encapsulation equipment;
- UV-A lamp (mBraun);
- UV-Ozone substrate cleaner (mBraun);
- Spin-coater (mBraun);
- Vacuum annealing furnace (Renggli);
- Weighing scales (Mettler Toledo).
- Oxygen-plasma substrate cleaner Zepto (Diener electronic);
- Steady-state and time-resolved spectroscopy equipment FLS980 (Edinburgh Instruments);
- Fume hoods (Flores Valles);
- Distilled water station (Millipore);
- OLED device current-voltage and photometric characteristics analyzer (Orb Optronix).
Head of the laboratory: dr. Karolis Kazlauskas
AFM SEM Lab
Methods:
- High resolution (up to 0,7 nm) scanning electron microscopy and X-ray spectral line elemental analysis.
- Samples can be coated with gold or chrome by magnetron sputtering and their cross-sections can be prepared by argon-ion beam etching.
- Scanning probe microscopy for sample surface topographical analysis.
- Optical-fluorescence-polarization microscopy for fluorescent sample analysis.
- Colloidal nanoparticle size analysis by dynamic light scattering method.
- Small-molecule crystal structural analysis by X-ray diffraction.
Equipment:
- Scanning electron microscope (SEM) HITACHI SU8230 with energy-dispersive x-ray spectrometer (EDX) Bruker XFlash 6|60 add-on for elemental analysis;
- Scanning probe microscope Bruker Dimension Icon;
- X-ray diffractometer Rigaku XtaLAB Synergy-S for organic single crystal structural analysis;
- Colloidal nanoparticle characterization system Malvern Zetasizer NANO-S;
- Optical fluorescence microscope Olympus BX51;
- Sample-coating equipment Q150T for SEM analysis;
- Sample preparation/cutting argon-ion beam system HITACHI IM 4000.
Head of laboratory: dr. Gediminas Kreiza
Projects
Ongoing:
Pažangių optoelektronikos medžiagų kūrimas taikant išmaniąją molekulių inžineriją
Number: 09.3.3-LMT-K-718-01-0026
Head: prof. S. Juršėnas
Duration: 2018-2021
Funding: 940 000 EUR
Agency: LMT
Tripletinių būsenų inžinerija organinės optoelektronikos medžiagose
Number: 09.3.3-LMT-K-712-01-0084
Head: dr. K. Kazlauskas
Duration: 2018-2021
Funding: 600 000 EUR
Agency: LMT
Perovskite laser (PERLAS)
Number : MIP-17-71
Head: prof. S. Juršėnas
Duration : 2017-2020
Funding : 100 000 EUR
Agency : LMT
Šviesos konversijos našumo organiniuose sluoksniuose didinimas taikymams optoelektronikoje
Number: S-MIP-17-77
Head: dr. K. Kazlauskas
Duration: 2017-2020
Funding: 100 000 EUR
Agency: LMT
Completed:
Towards the development of an organic laser transistor
Number : LJB-15-009
Head: prof. S. Juršėnas
Duration : 2015-2017
Funding: 80 000 EUR
Agency : LMT
Control of the photophysical properties of multifunctional molecular systems
Number : VP1-3.1-ŠMM-07-K-02-012
Head: prof. S. Juršėnas
Duration : 2012-2015
Funding: 400 000 EUR
Agency : LMT
Flexible structure bearing bifluorene compounds for optoelectronics industry
Number : VP1-3.1-ŠMM-10-V-02-023
Head: dr. K. Kazlauskas
Duration : 2013-2015
Funding: 420 000 EUR
Agency : ESFA
Organic optoelectronic materials targeted for large scale synthesis
Number : 31V-142
Head: prof. S. Juršėnas
Duration : 2011-2013
Funding:
Agency : MITA
Publications
2022
R. Skaisgiris, T. Serevičius, J. Dodonova, D. Banevičius, K. Kazlauskas, S.Tumkevičius, and S. Juršėnas, „Tuning of HOMO-LUMO localization for achieving thermally activated delayed fluorescence“, Journal of Luminescence Vol. 241, p. 118473 (1-7), 2022
2021
G. Kreiza, D. Berenis, D. Banevičius, S. Juršėnas, T. Javorskis, E. Orentas, K. Kazlauskas, „High efficiency and extremely low roll-off solution- and vacuum-processed OLEDs based on isophthalonitrile blue TADF emitter“, Chemical Engineering Journal, Vol. 412, p. 128574 (1-7), 2021
T. Serevičius, R. Skaisgiris, I. Fiodorova, G. Kreiza, D. Banevičius, K. Kazlauskas, S. Tumkevičius, and S. Juršėnas, „Single-exponential solid-state delayed fluorescence decay in TADF compounds with minimized conformational disorder“, Journal of Materials Chemistry C, Vol. 9, p. 836-841, 2021
R. Munoz-Marmol, P. G. Boj, J.M. Villalvilla, J.A. Quintana, N. Zink-Lorre, A. Sastre-Santos, J. Arago, E. Orti, P. Baronas, D. Litvinas, S. Juršėnas, F. Fenandez-Lazaro, and M.A. Diaz-Garcia, “Effect of Substituents at Imide Positions on the Laser Performance of 1,7-Bay-Substituted Perylenediimide Dyes”, Journal of Physical Chemistry C, Vol. 125, p. 12277-12288, 2021
P. Baronas, R. Komskis, E. Tankelevičiūtė, P. Adomėnas, O. Adomėnienė, and S. Juršėnas, “Helical Molecular Orbitals to Induce Spin–Orbit Coupling in Oligoyne-Bridged Bifluorenes”, Journal of Physical Chemistry Letters, Vol. 12, p. 6827-6833, 2021
E. Radiunas, M. Dapkevičius, L. Naimovičius, P. Baronas, S. Raišys, S. Juršėnas, A. Jozeliūnaitė, T. Javorskis, U. Šinkevičiūtė, E. Orentas, and K. Kazlauskas, “NIR-to-vis photon upconversion in rubrenes with increasing structural complexity”, Journal of Materials Chemistry C, Vol. 9, p. 4359-4366, 2021
S. Raišys, O. Adomėnienė, P. Adomėnas, S. Juršėnas, K. Kazlauskas, “Application of singlet sink approach for matrix-free amorphous photon upconversion films”, Dyes and Pigments, Vol. 194, p. 109565 (1-8), 2021
S. Raišys, O. Adomėnienė, P. Adomėnas, A. Rudnick, A. Köhler, K. Kazlauskas, “Triplet exciton diffusion and quenching in matrix-free solid photon upconversion films”, Journal of Physical Chemistry C, Vol. 125, No. 7, p. 3764-3775, 2021
T. Serevičius, R. Skaisgiris, G. Kreiza, J. Dodonova, K. Kazlauskas, E. Orentas, S. Tumkevičius, and S. Juršėnas, „TADF Parameters in the Solid State: An Easy Way to Draw Wrong Conclusions“, Journal of Physical Chemistry A Vol. 125, p. 1637-1641, 2021
D. Litvinas, R. Aleksiejūnas, P. Ščajev, P. Baronas, V. Soriūtė, Ch. Qin, T. Fujihara, T. Matsushima, Ch. Adachi, and S. Juršėnas, „Energy transfer in (PEA)2FAn−1PbnBr3n+1 quasi-2D perovskites“, Journal of Materials Chemistry C Vol. 9, p. 4782-4791, 2021
2020
T. Serevičius, R. Skaisgiris, J. Dodonova, K. Kazlauskas, S. Juršėnas, and S. Tumkevičius, “Minimization of solid-state conformational disorder in donor–acceptor TADF compounds”, Physical Chemistry Chemical Physics Vol. 22, p. 265-272, 2020.
N.S. Mahon, O.V. Korolik, M.V. Khenkin, G.E. Arnaoutakis, Y. Galagan, V. Soriūtė, Dž. Litvinas, P. Ščajev, E.A. Katz, A.V. Mazanik, “Photoluminescence kinetics for monitoring photoinduced processes in perovskite solar cells”, Solar Energy Vol. 195, p. 114-120, 2020.
M. Kolenda, D, Kežys, I. Reklaitis, E. Radiunas, R. Ritasalo, A. Kadys, T. Grinys, T. Malinauskas, S. Stanionytė, M. Skapas, R. Petruškevičius, R. Tomašiūnas, „Development of polarity inversion in a GaN waveguide structure for modal phase matching“, Journal of Materials Science, Vol. 55, p. 12008-12021, 2020.
T. Serevičius, J. Dodonova, R. Skaisgiris, D. Banevičius, K. Kazlauskas, S. Juršėnas, and S. Tumkevičius, “Optimization of the carbazole–pyrimidine linking pattern for achieving efficient TADF”, Journal of Materials Chemistry C, Vol. 8, p. 11192-11200, 2020.
S. Miasojedovas, P. Ščajev, K. Jarašiūnas, B. Gil, and H. Miyake, “Photoluminescence efficiency of Al-rich AlGaN heterostructures in a wide range of photoexcitation densities over temperatures up to 550 K”, Physical Review B, Vol. 102, p. 035201 (1-14), 2020.
T. Serevičius, R. Skaisgiris, J. Dodonova, L. Jagintavičius, D. Banevičius, K. Kazlauskas, S. Tumkevičius, and S. Juršėnas, “Achieving Submicrosecond Thermally Activated Delayed Fluorescence Lifetime and Highly Efficient Electroluminescence by Fine-Tuning of the Phenoxazine−Pyrimidine Structure”, ACS Applied Materials & Interfaces, Vol. 12, p10727-10736, 2020.
P. Ščajev, V. Soriūtė, G. Kreiza, T. Malinauskas, S. Stanionytė, P. Onufrijevs, A. Medvids, and H-H. Cheng, “Temperature dependent carrier lifetime, diffusion coefficient, and diffusion length in Ge0.95Sn0.05 epilayer”, Journal of Applied Physics, Vol. 128, p. 115103, 2020.
T. Serevičius, R. Skaisgiris, I. Fiodorova, V. Steckis, J. Dodonova, D. Banevičius, K. Kazlauskas, S. Juršėnas, S. Tumkevičius, “Achieving efficient deep-blue TADF in carbazole-pyrimidine compounds”, Organic Electronics, Vol. 82, p 105723 (1-5), 2020.
E. Radiunas, S. Raišys, S. Juršėnas, A. Jozeliūnaitė, T. Jarovskis, U. Šinkevičiūtė, E. Orentas, K. Kazlauskas, „Understanding the Limitations of NIR-to-Visible Photon Upconversion in Phthalocyanine-Sensitized Rubrene Systems“, Journal of Materials Chemistry C, Vol. 8, p. 5525-5534, 2020.
E. Radiunas, M. Dapkevičius, S. Raišys, S. Juršėnas, A. Jozeliūnaitė, T. Javorskis, U. Šinkevičiūtė, E. Orentas and K. Kazlauskas, “Impact of t-butyl substitution in a rubrene emitter for solid state NIR-to-visible photon upconversion”, Physical Chemistry Chemical Physics, Vol. 22, p. 7392-7403, 2020.
G. Kreiza, D. Banevičius, J. Jovaišaitė, S. Juršėnas, T. Javorskis, V. Vaitkevičius, E. Orentas, and K. Kazlauskas, “Realization of deep-blue TADF in sterically controlled naphthyridines for vacuum- and solution-processed OLEDs, Journal of Materials Chemistry C, Vol. 8, p. 8560-8566, 2020.
D. Berenis, G. Kreiza, S. Juršėnas, E. Kamarauskas, V. Ruibys, O. Bobrovas, P. Adomėnas, K. Kazlauskas, “Different RISC rates in benzoylpyridine-based TADF compounds and their implications for solution-processed OLEDs”, Dyes and Pigments, Vol. 182, p-108579 (1-9), 2020.
I. Reklaitis, E. Radiunas, T. Malinauskas, S. Stanionytė, G. Juška, R. Ritasalo, T. Pilvi, S. Taeger, M. Strassburg, R. Tomašiūnas, „A Comparative Study on Atomic Layer Deposited Oxide Film Morphology and Their Electrical Breakdown“, Surface and Coatings Technology, Vol. 399, p. 126123 (1-15), 2020.
P. Ščajev, S. Miasojedovas, S. Juršėnas, “A carrier density dependent diffusion coefficient, recombination rate and diffusion length in MAPbI(3)and MAPbBr(3)crystals measured under one- and two-photon excitations”, Journal of Materials Chemistry C, Vol. 8, p. 10290-10301, 2020.
V. Bonal, J.M. Villalvilla, J.A. Quintana, P.G. Boj, N. Lin, S. Watanabe, K. Kazlauskas, O. Adomėnienė, S. Juršėnas, H. Tsuji, E. Nakamura, and M.A. Díaz-García, „Blue and Deep-Blue-Emitting Organic Lasers with Top-Layer Distributed Feedback Resonators“, Advanced Optical Materials, Vol. 8, p. 2001153 (1-10), 2020.
P. Baronas, G. Kreiza, M. Mamada, S. Maedera, P. Adomėnas, O. Adomėnienė, K. Kazlauskas, C. Adachi, S, Juršėnas, „Enhanced Energy Transfer in Doped Bifluorene Single Crystals: Prospects for Organic Lasers“, Advanced Optical Materials, Vol. 8, p1901670, 2020.
J. Jovaišaitė, D. Cīrule, A. Jeminejs, I. Novosjolova, M. Turks, P. Baronas, R. Komskis, S. Tumkevičius, G. Jonušauskas, S. Juršėnas, „Proof of principle of a purine D-A-D' ligand based ratiometric chemical sensor harnessing complexation induced intermolecular PET“, Physical Chemistry Chemical Physics, Vol. 22, p. 26502, 2020.
2019
T. Serevičius, R. Skaisgiris, J. Dodonova, K. Kazlauskas, S. Juršėnas, S. Tumkevičius, Minimization of solid-state conformational disorder in donor–acceptor TADF compounds, Phys. Chem. Chem. Phys. 22 (2019) 265–272. https://doi.org/10.1039/C9CP05907E.
P. Ščajev, R. Aleksieju̅nas, S. Terakawa, C. Qin, T. Fujihara, T. Matsushima, C. Adachi, S. Juršėnas, Anisotropy of Thermal Diffusivity in Lead Halide Perovskite Layers Revealed by Thermal Grating Technique, J. Phys. Chem. C. 123 (2019) 14914–14920. https://doi.org/10.1021/acs.jpcc.9b02288.
P. Ščajev, R. Aleksieju̅nas, P. Baronas, D. Litvinas, M. Kolenda, C. Qin, T. Fujihara, T. Matsushima, C. Adachi, S. Juršėnas, Carrier Recombination and Diffusion in Wet-Cast Tin Iodide Perovskite Layers Under High Intensity Photoexcitation, J. Phys. Chem. C. 123 (2019) 19275–19281. https://doi.org/10.1021/acs.jpcc.9b03226.
P. Ščajev, D. Litvinas, V. Soriu̅tė, G. Kreiza, S. Stanionytė, S. Juršėnas, Crystal Structure Ideality Impact on Bimolecular, Auger, and Diffusion Coefficients in Mixed-Cation CsxMA1–xPbBr3 and CsxFA1–xPbBr3 Perovskites, J. Phys. Chem. C. 123 (2019) 23838–23844. https://doi.org/10.1021/acs.jpcc.9b05824.
D. Gudeika, A. Miasojedovas, O. Bezvikonnyi, D. Volyniuk, A. Gruodis, S. Jursenas, J.V. Grazulevicius, Differently substituted benzothiadiazoles as charge-transporting emitters for fluorescent organic light-emitting diodes, Dyes and Pigments. 166 (2019) 217–225. https://doi.org/10.1016/j.dyepig.2019.03.017.
T. Serevičius, R. Skaisgiris, J. Dodonova, L. Jagintavičius, J. Bucevičius, K. Kazlauskas, S. Juršėnas, S. Tumkevičius, Emission wavelength dependence on the rISC rate in TADF compounds with large conformational disorder, Chem. Commun. 55 (2019) 1975–1978. https://doi.org/10.1039/C8CC08906J.
P. Ščajev, D. Litvinas, G. Kreiza, S. Stanionytė, T. Malinauskas, R. Tomašiūnas, S. Juršėnas, Highly efficient nanocrystalline CsxMA1-xPbBrx perovskite layers for white light generation, Nanotechnology. 30 (2019) 345702. https://doi.org/10.1088/1361-6528/ab1a69.
M. Steponaitis, R. Komskis, E. Kamarauskas, T. Malinauskas, S. Jursenas, V. Getautis, Investigation of photophysical properties of triphenylamine phenylethenyl derivatives containing tertiary amine groups, Dyes and Pigments. 166 (2019) 122–129. https://doi.org/10.1016/j.dyepig.2019.03.026.
R. Skaisgiris, T. Serevičius, K. Kazlauskas, Y. Geng, C. Adachi, S. Juršėnas, Origin of dual emission in σ-bridged donor–acceptor TADF compounds, Journal of Materials Chemistry C. 7 (2019) 12601–12609. https://doi.org/10.1039/C9TC03548F.
G. Kreiza, D. Banevičius, J. Jovaišaitė, K. Maleckaitė, D. Gudeika, D. Volyniuk, J.V. Gražulevičius, S. Juršėnas, K. Kazlauskas, Suppression of benzophenone-induced triplet quenching for enhanced TADF performance, J. Mater. Chem. C. 7 (2019) 11522–11531. https://doi.org/10.1039/C9TC02408E.
R. Komskis, P. Adomėnas, O. Adomėnienė, P. Baronas, T. Serevičius, S. Juršėnas, Suppression of Charge Transfer States in Aryl-Substituted 9,9′-Bianthryl Derivatives, J. Phys. Chem. C. 123 (2019) 27344–27354. https://doi.org/10.1021/acs.jpcc.9b07625.
2018
P. Ščajev, C. Qin, R. Aleksieju̅nas, P. Baronas, S. Miasojedovas, T. Fujihara, T. Matsushima, C. Adachi, S. Juršėnas, Diffusion Enhancement in Highly Excited MAPbI3 Perovskite Layers with Additives, J. Phys. Chem. Lett. 9 (2018) 3167–3172. https://doi.org/10.1021/acs.jpclett.8b01155.
M. Montinaro, V. Resta, A. Camposeo, M. Moffa, G. Morello, L. Persano, K. Kazlauskas, S. Jursenas, A. Tomkeviciene, J.V. Grazulevicius, D. Pisignano, Diverse regimes of mode intensity correlation in nanofiber random lasers through nanoparticle doping, ACS Photonics. 5 (2018) 1026–1033. https://doi.org/10.1021/acsphotonics.7b01329.
S. Raišys, S. Juršėnas, Y.C. Simon, C. Weder, K. Kazlauskas, Enhancement of triplet-sensitized upconversion in rigid polymers via singlet exciton sink approach, Chem. Sci. 9 (2018) 6796–6802. https://doi.org/10.1039/C8SC02151A.
P. Baronas, P. Ščajev, V. Čerkasovas, G. Kreiza, P. Adomėnas, O. Adomėnienė, K. Kazlauskas, C. Adachi, S. Juršėnas, Exciton diffusion in bifluorene single crystals studied by light induced transient grating technique, Appl. Phys. Lett. 112 (2018) 033302. https://doi.org/10.1063/1.5008376.
P. Baronas, G. Kreiza, P. Adomėnas, O. Adomėnienė, K. Kazlauskas, J.-C. Ribierre, C. Adachi, S. Juršėnas, Low-Threshold Light Amplification in Bifluorene Single Crystals: Role of the Trap States, ACS Appl. Mater. Interfaces. 10 (2018) 2768–2775. https://doi.org/10.1021/acsami.7b14702.
T. Serevičius, T. Bučiūnas, J. Bucevičius, J. Dodonova, S. Tumkevičius, K. Kazlauskas, S. Juršėnas, Room temperature phosphorescence vs. thermally activated delayed fluorescence in carbazole–pyrimidine cored compounds, J. Mater. Chem. C. 6 (2018) 11128–11136. https://doi.org/10.1039/C8TC02554A.
2017
G. Kreiza, P. Baronas, E. Radiunas, P. Adomėnas, O. Adomėnienė, K. Kazlauskas, J.-C. Ribierre, C. Adachi, S. Juršėnas, Bifluorene Single Crystals with Extremely Low-Threshold Amplified Spontaneous Emission, Adv. Opt. Mater. 5 (2017) 1600823. https://doi.org/10.1002/adom.201600823.
T. Matulaitis, P. Imbrasas, N.A. Kukhta, P. Baronas, T. Bučiu̅nas, D. Banevičius, K. Kazlauskas, J.V. Gražulevičius, S. Juršėnas, Impact of Donor Substitution Pattern on the TADF Properties in the Carbazolyl-Substituted Triazine Derivatives, J. Phys. Chem. C. 121 (2017) 23618–23625. https://doi.org/10.1021/acs.jpcc.7b08034.
V. Resta, A. Camposeo, M. Montinaro, M. Moffa, K. Kazlauskas, S. Jursenas, A. Tomkeviciene, J.V. Grazulevicius, D. Pisignano, Nanoparticle-doped electrospun fiber random lasers with spatially extended light modes, Opt. Express. 25 (2017) 24604–24614. https://doi.org/10.1364/OE.25.024604.
A. Ivanauskaite, R. Lygaitis, S. Raisys, K. Kazlauskas, G. Kreiza, D. Volyniuk, D. Gudeika, S. Jursenas, J.V. Grazulevicius, Structure–property relationship of blue solid state emissive phenanthroimidazole derivatives, Phys. Chem. Chem. Phys. 19 (2017) 16737–16748. https://doi.org/10.1039/C7CP02248D.
T. Serevičius, R. Komskis, P. Adomėnas, O. Adomėnienė, G. Kreiza, V. Jankauskas, K. Kazlauskas, A. Miasojedovas, V. Jankus, A. Monkman, S. Juršėnas, Triplet–Triplet Annihilation in 9,10-Diphenylanthracene Derivatives: The Role of Intersystem Crossing and Exciton Diffusion, J. Phys. Chem. C. 121 (2017) 8515–8524. https://doi.org/10.1021/acs.jpcc.7b01336.
P. Ščajev, R. Aleksieju̅nas, S. Miasojedovas, S. Nargelas, M. Inoue, C. Qin, T. Matsushima, C. Adachi, S. Juršėnas, Two Regimes of Carrier Diffusion in Vapor-Deposited Lead-Halide Perovskites, J. Phys. Chem. C. 121 (2017) 21600–21609. https://doi.org/10.1021/acs.jpcc.7b04179.
T. Braukyla, N. Sakai, M. Daskeviciene, V. Jankauskas, E. Kamarauskas, R. Komskis, T. Malinauskas, S. Jursenas, H.J. Snaith, V. Getautis, V-Shaped Hole-Transporting TPD Dimers Containing Tröger’s Base Core, J. Phys. Chem. C. 121 (2017) 10267–10274. https://doi.org/10.1021/acs.jpcc.6b11880.
2016
M. Inoue, T. SereviĿius, H. Nakanotani, K. Yoshida, T. Matsushima, S. JuršĿnas, C. Adachi, Effect of reverse intersystem crossing rate to suppress efficiency roll-off in organic light-emitting diodes with thermally activated delayed fluorescence emitters, Chem. Phys. Lett. 644 (2016) 62–67. https://doi.org/10.1016/j.cplett.2015.11.042.
G. Kreiza, K. Kazlauskas, A. Bieliauskas, V. Getautis, A. Šačkus, S. Juršėnas, Fluorescence sensing based on phenylenediacetonitrile doped into polymer host, J. Lumin. 170 (2016) 293–298. https://doi.org/10.1016/j.jlumin.2015.10.040.
R. Rimkus, S. Tumkevičius, T. Serevičius, R. Komskis, P. Adomėnas, A. Gruodis, V. Jankauskas, K. Kazlauskas, S. Juršėnas, Heterocyclic heptacene analogs – 8H-16,17-epoxydinaphto[2,3-c:2′,3′-g]carbazoles as charge transport materials, Dyes Pigm. 124 (2016) 133–144. https://doi.org/10.1016/j.dyepig.2015.08.029.
P. Baronas, K. Kazlauskas, A. Gruodis, V. Jankauskas, A. Tomkeviciene, J. Simokaitiene, J. Vidas Grazulevicius, S. Jursenas, High-triplet-energy carbazole and fluorene tetrads, J. Lumin. 169 (2016) 256–265. https://doi.org/10.1016/j.jlumin.2015.08.019.
S. Raišys, K. Kazlauskas, S. Juršėnas, Y.C. Simon, The Role of Triplet Exciton Diffusion in Light-Upconverting Polymer Glasses, ACS Appl. Mater. Interfaces. 8 (2016) 15732–15740. https://doi.org/10.1021/acsami.6b03888.
2015
J. Bucevicius, L. Skardziute, J. Dodonova, K. Kazlauskas, G. Bagdziunas, S. Jursenas, S. Tumkevicius, 2,4-Bis(4-aryl-1,2,3-triazol-1-yl)pyrrolo[2,3-d]pyrimidines: synthesis and tuning of optical properties by polar substituents, RSC Adv. 5 (2015) 38610–38622. https://doi.org/10.1039/C5RA05482F.
K. Kazlauskas, G. Kreiza, E. Radiunas, P. Adomėnas, O. Adomėnienė, K. Karpavičius, J. Bucevičius, V. Jankauskas, S. Juršėnas, Concentration effects on spontaneous and amplified emission in benzo[c]fluorenes, Phys. Chem. Chem. Phys. 17 (2015) 12935–12948. https://doi.org/10.1039/C5CP01325A.
P. Baronas, K. Kazlauskas, G. Kreiza, V. Jankauskas, A. Tomkeviciene, J. Simokaitiene, S. Grigalevicius, J.V. Grazulevicius, S. Jursenas, Differently linked fluorene-carbazole triads for light amplification, Dyes Pigm. 123 (2015) 370–379. https://doi.org/10.1016/j.dyepig.2015.08.019.
P. Data, R. Motyka, M. Lapkowski, J. Suwinski, S. Jursenas, G. Kreiza, A. Miasojedovas, A.P. Monkman, Efficient p-phenylene based OLEDs with mixed interfacial exciplex emission, Electrochim. Acta. 182 (2015) 524–528. https://doi.org/10.1016/j.electacta.2015.09.110.
K. Kazlauskas, G. Kreiza, O. Bobrovas, O. Adomėnienė, P. Adomėnas, V. Jankauskas, S. Juršėnas, Fluorene- and benzofluorene-cored oligomers as low threshold and high gain amplifying media, Appl. Phys. Lett. 107 (2015) 043301. https://doi.org/10.1063/1.4927555.
T. Serevičius, P. Adomėnas, O. Adomėnienė, K. Karpavičius, J. Bucevičius, R. Komskis, G. Kreiza, V. Jankauskas, K. Kazlauskas, S. Juršėnas, Impact of non-symmetric 2,9,10-aryl substitution on charge transport and optical properties of anthracene derivatives, Dyes Pigm. 122 (2015) 147–159. https://doi.org/10.1016/j.dyepig.2015.06.010.
D. Gudeika, J.V. Grazulevicius, D. Volyniuk, R. Butkute, G. Juska, A. Miasojedovas, A. Gruodis, S. Jursenas, Structure-properties relationship of the derivatives of carbazole and 1,8-naphthalimide: Effects of the substitution and the linking topology, Dyes Pigm. 114 (2015) 239–252. https://doi.org/10.1016/j.dyepig.2014.11.013.
L. Skardziute, J. Dodonova, A. Voitechovicius, J. Jovaisaite, R. Komskis, A. Voitechoviciute, J. Bucevicius, K. Kazlauskas, S. Jursenas, S. Tumkevicius, Synthesis and optical properties of the isomeric pyrimidine and carbazole derivatives: Effects of polar substituents and linking topology, Dyes Pigm. 118 (2015) 118–128. https://doi.org/10.1016/j.dyepig.2015.03.008.
R.R. Reghu, J. Simokaitiene, J.V. Grazulevicius, S. Raisys, K. Kazlauskas, S. Jursenas, V. Jankauskas, A. Reina, Synthesis and properties of hole-transporting triphenylamine-derived dendritic compounds, Dyes Pigm. 115 (2015) 135–142. https://doi.org/10.1016/j.dyepig.2014.12.013.