Alidzhanov E.K., Lantukh Yu.D, Letuta S.N., Pashkevitch S.N., Razdobreev D.A.
THE EXCITATION ENERGY AND CHARGE TRANSFER IN DONOR-ACCEPTOR SYSTEMS BASED ON SEMICONDUCTOR POLYMER ^{[№ 6 ' 2018]}
The effectiveness of energy transfer process of photo-excitation in donor-acceptor (DA) systems formed from semiconductor polymer poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) with the addition of simple and endohedral fullerenes were investigated. It is shown that the energy transfer efficiency in the systems formed in the form of dilute solutions is on several orders of magni-tude higher than the theoretically expected energy transfer efficiency by the diffusion-controlled mechanism. On the basis of comparison of experimentally measured spectra of electron absorption of Y@C₈₂, C₆₀ C₇₀ toluene solutions and the MEH-PPV luminescence spectrum the corresponding Förster radii of resonance energy transfer were estimated. For the tested DA systems a significant effect of exciton mi-gration between polymer links on the process of luminescence quenching was estab-lished. It is shown that the DA system formed using endohedral fullerenes is most effective.

Alidzhanov E.K., Lantukh Yu.D., Pashkevitch S.N., Razdobreev D.A., Bubnov V.P., Kareev I.E.
THE FORMATION OF ENDOMETALLOFULLERENES LANTHANIDES CLUSTERS IN SOLVENT AND ON THE SOLID SURFACE ^{[№ 13 ' 2015]}
The formation of the clusters in solution and on a solid surface can significantly modify the photophysical properties of the studied systems. Process of endometallofullerenes (EMFs) lanthanides (La, Gd, Ce) clusters formation in the polar solvent (dimethylformamide  — DMF) and on the mica surface by static and dynamic light scattering methods as well as atomic force microscopy was investigated. It is shown that endometallofullerenes in the solvent and on the mica surface form a stable system of nanoclusters with predominant dimension 50–60 nm. The combination of the methods of dynamic and static light scattering allowed us to estimate the molar mass of the scattering centers. Based on these data, the conclusion about the fractal nature of the EMF clusters and the estimation of their fractal dimension d ≈ 2.3 has been done. Zeta-potential of the EMF clusters in the DMF solution was measured. It is shown that the EMFs clusters have a negative charge and its zeta-potential value is –30 mV.

Lantukh J.D., Pashkevich S.N., Alidzhanov E.K.
PHOTOPHYSICS OF OPTICAL FUNCTIONAL MATERIALS BASED ON BIOPOLYMER COMPLEXES WITH ORGANIC DYES ^{[№ 13 ' 2015]}
Research of physical and chemical properties of organic dyes complexes with biopolymers of different nature is an important task in connection with the great potential of such systems in medicine, nanotechnology, molecular electronics, photonics. This paper presents the results of the optical properties of film studies supramolecular structures based on organic dyes and biopolymers (DNA, chitosan), as well as opportunities for application of these materials in optoelectronics. A method for producing an optically uniform film structures on the basis of double-stranded DNA is formed on the principle of "guest — host", in which the dye molecules ( "guest") have high fluorescence ability. Superluminescence pyronine G obtained in such a system. A method for obtaining effective phosphors based system anionic dye — chitosan. The film system sulforhodamine B — chitosan is also obtained the effect of the dye Superluminescence. Experimentally demonstrated the possibility of using DNA-dye film material as a proximity sensor (sensor element) relative humidity. It is shown that the tested optical functional materials based on biopolymer systems — dye can be used as highly efficient phosphors, proximity sensors and other devices in optoelectronics.

Letuta S.N., Ischemgulov A.T., Paschkevich S.N., Lantukh Yu.D., Alidjanov E.K., Sokabaeva S.S.
FLYORESCENT DOSIMETRY IN PHOTODYNAMIC THERAPY ^{[№ 13 ' 2015]}
The long-lived photoexcitations relaxation processes of fluorophores in biological tissues with molecular oxygen presence are investigated. This subject has a practical significance because of the active elaboration of photodynamic therapy and optical diagnostic. The futures of delayed fluorescence and phosphorescence in erythrosine stained healthy and cancer-diseased mammary gland tissues of BYRB-line mice were investigated in vitro. The dominant role of diffusive-mobile molecular oxygen in relaxation of triplet-excited long-life states of the dye molecules in cells is determined. A novel phenomenon of suppression of stained tissue delayed fluorescence under pulsed laser irradiation was revealed. The phenomenon was named as light quenching of delayed fluorescence (LQDF). The using of this phenomenon will greatly simplify the determination of the radiation "dose" in photodynamic therapy directly during the treatment session. Statistically certain distinction between delayed fluorescence characterization as well as LQDF extent in healthy and pathological tissues was established.

Lantukh Yu.D., Pashkevich S.N.
SUPERLUMINESCENCE IN THE DNA-DYE FILM STRUCTURES ^{[№ 12 ' 2012]}
The method of production of optical uniform double-helical DNA film structures is proposed. These structures were formed according to the "guest-host" principle and the dye molecules act as the "guest" and demonstrate high fluorescence capability. Superluminescence of Pyronin G is realized in such system.

Alidzhanov E.K., Lantukh Yu.D., Letuta S.N., Pashkevitch S.N., Loginov B.A.
PHOTOVOLTAIC EFFECT IN THE PHTHALOCYANINE AND PERYLENE ORGANIC JUNCTION LAYERS ^{[№ 12 ' 2011]}
Organic solar sell consisting from PTCDA donor and CuPc acceptor layers was formed. Its photophysical properties were investigated. It was shown that obtained multilayer system has nonlinear I-U dark characteristic and can induce photoelectromotive force jmax =0.6 V. On the base of the investigation of photoelectric cell spectral sensitivity its heterojunction efficient thickness was evaluated.

Alidzhanov E.K., Lantukh Yu.D., Letuta S.N., Pashkevich S.N.
SURFACE PHOTOCONDUCTIVITY GAAS SENSITIZED WITH ORGANIC DYES ^{[№ 1 ' 2005]}
The results of experimental researches of optic and transport characteristics and photoconductivity of haliy arsenide surface, covered with lyer of tritane (crystalline violet) and xanthene (fluorescein) dyes are given in this article. For crystalline violet dye is discovered the effect of photoconductivity in spectral sphere, which does not coincide with line of own dye absorption. Possible mechanisms of spectral sensitizing of semi-conductor surface are discussed here too.

Razdobreev D.A., Lantukh U.D., Stryapkov A.V., Pashkevich S.N., Alidzhanov E.K.
THIAZINE DYE DIMERIC FORMS DISSOSIATING ABSORPTION SPECTRUMS AND CONSTANTS ^{[№ 2 ' 2004]}
Thiazine dye - methylene blue (Mg+) and thionine (TN+) in water solutions dimeric forms dissociating absorption spectrums and constants are calculated based on spectrumphotometric data. Conclusions on dimeric molecules structure of the dyes are made.