Department of molecular photoelectronics

At the beginning of 1967 a laboratory for organic semiconductors was established at Department of Physics of Crystals. In 1978 the laboratory was reorganized into institute-level laboratory for organic semiconductors. Later it was renamed to “Laboratory of Photonics” and in 1983 it became Department of Molecular Photoelectronics.

  • Electronic processes in molecular systems;
  • Photoelectronics of multifunctional molecular nanocomposites;
  • Molecular nanophotoelectronics;
  • Physics of thermotropic and lyotropic liquid crystals.

Equipment and facilities

  • Optical spectroscopy instruments including time resolved single photon counting fluorescence lifetime spectroscopy (spectroscopic unit based on LifeSpec II (Edinburgh Instruments) setup, novel USB spectro-fluorimeters Maya 2000 Pro and USB 2000 + Enhaced Sens. (Ocean Optics); UVVIS spectrophotometer (Shimadzu));
  • Organic and inorganic vapor-deposition facilities;
  • Polarizing microscopes (Carl Zeiss, Olympus) with high-speed and highsensitivity cameras;
  • Digital multimeters and electrometers, functional generators, lock-in amplifiers.
  • A basis for physics of organic semiconductors in Ukraine was provided, that initiated development of new areas in photoelectronics: electronics of organic materials and nanophotoelectronics;
  • shape of the long-wavelength part of electro absorption spectra in condensed media was experimentally confirmed as a function of photon energy and temperature – Urbach rule, which is one of the main optical techniques for study of dynamics of elementary excitations in crystals;
  • role of excitons in photoelectronic phenomena in molecular crystals was studied, that provided a stimulus for development of nanophotoelectronics;
  • physics of topological defects in liquid crystals was developed;
  • a method of liquid crystalline thermography and wedge-shaped dehydration was devised, that initiated study of liquid crystals in the Institute;
  • physical studying of natural lyotropic liquid crystals was initiated, that lie in the basis of many new areas like, for example, physics of drinking water, physical ecology of a man, and physical medicine.
  • A basis for the physics of organic semiconductors in Ukraine was provided, which initiated the development of new areas in photoelectronics: electronics of organic materials and nanophotoelectronics.
  • The shape of the long-wavelength part of electronic absorption spectra in condensed matter was experimentally confirmed as a function of photon energy and temperature – Urbach rule, which is one of the main optical techniques studying the of dynamics of elementary excitations in crystals;
  • The role of excitons in photoelectronic phenomena in molecular crystals was studied, which provided a stimulus for the development of nanophotoelectronics;
  • A method of liquid crystalline thermography and wedge-shaped dehydration was proposed, which initiated an extensive study of liquid crystals at the Institute of Physics.
  • A novel approach of carbon nanotubes sensing and functionalization was demonstrated: ionic complexes of CNT – organic dye with a sensitive and selective response in photoluminescent signal due to transferring excitation of the dye to the tubes resulting in selective and strong amplification of the light emission from carbon nanotube excitonic levels in near-infrared spectral range.
  • Using laser tweezers, 2D and 3D colloidal crystals composed of micrometer- sized microspheres were assembled in a nematic liquid crystal matrix. The 3D crystal has a tetragonal symmetry and demonstrates giant electrostriction and electrorotation under an external electric field depending on the sign of dielectric anisotropy in the liquid crystal matrix.
  • Studies of colloidal particles in the liquid crystal matrix revealed that the specific physical properties of liquid crystal phase turn the Brownian dynamics of colloidal particles into an anisotropic and anomalous one. It was shown that time dependent fluctuations and reorientations of liquid crystal molecules alter the time dependence of the mean square displacement, which may grow faster or slower in time, realizing the super- and subdiffusion regimes, respectively.

Monographs

  • M.V. Kurik, V.M. Tsmots’. Physics of solid state (school-book). Kyiv, 1985 (in Ukrainian).
  • Z.Yu. Gotra, M.V. Kurik, V.M. Mykytyuk. Strucure of liquid crystals. Kyiv, 1989 (in Ukrainian).
  • M.V. Kurik, E.A. Silinsh, V. Chapek. Electronic processes in organic molecular crystals. Phenomenon of polarization localization. Riga, 1988 (in Russian).
  • M.V. Kurik. Man and ultraviolet light. Kyiv, 2003 (in Ukrainian).
  • N.G. Golubeva, M.V. Kurik. Basics of bioenergoinformational medicine. Kyiv, 2007 (in Russian).
  • Kurik M.V. Urbach Rule . Phys. St. Solidi (a).1971. 8 (a). 9-45.
  • M.V. Kurik, O.D. Lavrentovich. Defects in liquid crystals: homotopy theory and experimental study. Uspekhi fiz. Nauk, vol. 154, p.381, 1988.

Articles

  • М.В.Курик "Правило Урбаха в оптике конденсированных состояний", УФЖ.-1994, 39, N11-12, c.1058.
  • М.В.Курик, Ю.П.Пирятинский "Фотогенерация и перенос носителей заряда в кристаллах пентацена при низких температурах", УФЖ.-1993,38,N1,c.70.
  • О.Д.Лаврентович, В.Г.Назаренко, В.М.Пергаменщик, В.В.Серган, В.М.Сорокин "Поверхностный поляризационный електрооптический эффект в нематическом жидком кристалле" , ЖЭТФ.-1991, 99,N3,c.777.
  • O.D. Lavrentovich, V.G.Nazarenko, V.V.Sergan, G.Durand Dielecctric quenching of the electric polar surface instability in a nematic liquid crystal. Phys.Rev.A.-1992,45,N10, p.R6969.
  • V.G.Nazarenko, O.D.Lavrentovich Anchoring transition in a nematic liquid crystal composed of centrosimmetric molecules. Phys.Rev.E.-1994,49, N2, p.288.
  • О.В.Ковальчук "Низькочастотна та інфранизькочастотна діелектрична спектроскопія межі поділу рідкий кристал-тверде тіло. Шари ковзання". УФЖ.-1996,41,N10,c.991.
  • О.В.Ковальчук "Низькочастотна та інфранизькочастотна діелектрична спектроскопія межі поділу рідкий кристал-тверде тіло. Шари Гуї". УФЖ.-1996,41,N11-12,c.1093.
  • Kravchuk R., Koval’chuk O.O., Yaroshuk O. Filling initiated ion transport processing liquid crystal cell //Mol.Cryst. Liq. Cryst. – 2002.0v.385. –111-119.
  • Гуцуляк Х.В., Манжара В.С., Мельник М.В., Калин Т. Связь между строением и фотоустойчивостью производных декагидроакридина.
    Журнал прикл. спектр. 72, № 4, 2005. С.454-459.
  • S.A.Davidenko, M.V.Kurik, Yu.P.Piryatinskii, A.B.Verbitsky, Studies of Melanin Pigments of Different Origin, Molecular Crystals and Liquid Crystals vol.426, pp. 37-45 (2005).
  • Piryatinskii Yu.P., Dolgov L.O.,Yaroshchuk O.V., Lazarouk S. Fluorescence of porous silicon filled with liquid crystal 5CB, Molecular Crystals and Liquid Crystals; 2007; v.467. p.195-202.
  • Ya.Vertsimakha, A.Verbitsky, New Method of Preparation of Composites Promising for the Development of Plastic Solar Cells; in: Solar Cell Research Progress (Ed.J.Carson), Chapter 8, pp. 297-317. Nova Publishers, NY, 2008.
  • A.B.Nych, U.M.Ognysta, V.M.Pergamenshchik, B.I.Lev, V.G.Nazarenko, I.Musevic, M.Skarabot, and O.D.Lavrentovich, Coexistence of Two Colloidal Crystals at the Nematic Liquid Crystal – Air Interface, Phys. Rev. Lett. 98. 057801,2007.
  • V.G.Nazarenko, O.P.Boiko, A.B.Nych, Yu.A.Nastishin, V.M.Pergamenshchik, P.Bos, Selective light-induced surface desorption: the mechanism behind the photoalignmemt of liquid crystals at surfaces, Europhys. Lett., 75(3), 448-454 (2006).
  • O.P.Boiko, R.M.Vasyuta, Yu.A.Nastishin, V.G.Nazarenko,V.M.Pergamenshchik and O.D.Lavrentovich. Polarizing properties of functional optical films based on lyotropic chomonic liquid crystais. Mol. Cryst. Liq. Cryst., Vol. 467. Pp. 181-194.2007.
  • U. Ognysta, A. Nych, V. Nazarenko, I. Musevic, M. Skarabot, M. Ravnik, S. Zumer, I. Poberaj, and D. Babic. 2D Interactions and Binary Crystals of Dipolar and Quadrupolar Nematic Colloids. Phys.Rev.Lett. 100, 217803 (2008).
  • Employees of the Department of Molecular photoelectronics in 1990.

  • The department M.V. Couric and Y.I. Vertsimakha.

  • Graduate fiery Juliana and Vasjuta
    novel explores the structure of liquid crystals.

  • Researcher, Cand. Science Nych A.B.
    and graduate student Ognysta U. doing research.

  • Deputy Head. Department of Molecular photoelectronics st.n.s. Kovalchuk O.
    and graduate student Shevchuk O. for installation.

  • Senior Researcher, Candidate of Sciences Manjara V.S.
    at installation spectral studies.

  • Prikhodko A.F. and Pyryatynskyy Y.P.

  • Research of photoelectric and electro-optical phenomena in molecular structures with the spatial arrangement of different dimensionality” (state registration No. 0195U014442);
  • “Investigation of the processes of collective interactions in molecular systems based on liquid crystals” (state registration No. 0101U000354);
  • “Photoelectronics of Multifunctional Molecular Composites” (state registration No. 0107U002347);
  • “Study of Excitonic and Electronic Processes in Molecular Composites” (state registration No. 0112U0020609);
  • “Novel macromolecular complexes for rapid detections of hazardous agents” (NATO Science for Peace Program, Project No. SfP 984189);
  • INTAS project #30234; STCU projects #637/1, #2025/1, #3091, #5258; CRDF project #UK-P1-2598-KV-04; NSF project “Materials World Network on Chromonic Liquid Crystals”.

Schematic experimental setup for measuring the anisotropic elasticity of lyotropic liquid crystals,
which are formed through the aggregation of organic molecules in water,
by exploring their reorientation in a magnetic field [13]

Time-resolved photoluminescence (PL) kinetics for astraphloxin dye with carbon
nanotubes (curve 1) and neat astraphloxin dye (curve 2) taking into account the instrument response function (IRF),
(curve 3) measured with LifeSpec II (Edinburgh Instruments Ltd.)
using the Time-Correlated Single Photon Counting (TCSPC) technique [16]

3D colloidal crystal in a nematic liquid crystal matrix:
the assembling step (top) and a 3D reconstruction from
Fluorescent Confocal Polarizing Microscopy data (bottom) [14]