21 Result(s)

Article

Nonlinear optical properties of poly(N-vinylcarbazole)-C₆₀ nanocomposites

The influence of the fullerene content and temperature on the IR absorption and luminescence spectra of poly(N-vinylcarbazole) (PVK)-C₆₀ composites prepared by vacuum deposition has been studied. It has been demo...

M. A. Zabolotny, E. S. Kobus, O. P. Dmitrenko, N. P. Kulish… in Physics of the Solid State (2010)

Article

Nanomaterials based on CdS nanoparticles in polyethylene matrix

The synthesis of CdS nanoparticles stabilized in the bulk of a polyethylene matrix is described. The size of synthesized nanoparticles is determined by means of transmission electron microscopy. The compositio...

M. V. Radchenko, G. V. Lashkarev, V. I. Sichkovskyi, A. A. Arshakuni… in Inorganic Materials (2009)

Article

Photoelectric properties of a self-ordered molecular disperse structure based on a polar-dye solution in a liquid-crystal matrix

An analysis of photoluminescence spectra and nonlinear optical properties revealed the effect of polar-dye aggregates in a liquid-crystal matrix on the formation of an ordered molecular disperse structure. As ...

Yu. P. Piryatinskiĭ, M. M. Sevryukova in Physics of the Solid State (2007)

Article

Effect of the molecular-dispersed structure of a polar dye solution on its photoluminescence spectra and second harmonic generation in a liquid crystal matrix

The influence of aggregation of polar dye molecules in a nematic liquid crystal (NLC) matrix of 4-p-pentyl-4′-cyanobiphenyl on the formation of a molecular-dispersed ordered system, its photoluminescence spectra,...

Yu. P. Piryatinskiĭ, M. M. Sevryukova in Technical Physics Letters (2007)

Article

Fluorescence of the nematic liquid crystal 5CB in nanoporous glasses

The fluorescence spectra of the nematic liquid crystal n-pentyl-n′-cyanobiphenyl (5CB) in porous glasses with pores from 1 to 44 nm in diameter are investigated. A decrease in the pore diameter leads to suppressi...

O. V. Yaroshchuk, Yu. P. Piryatinskiĭ, L. A. Dolgov, T. V. Bidna… in Optics and Spectroscopy (2006)

Article

Photoluminescence of liquid-crystal azo derivatives in nanopores

The fluorescence of the nematic liquid crystal n-butyl-n′-methoxyazoxybenzene (BMAOB) in the form of a layer and in porous glasses with pores of different diameter is investigated. The fluorescence spectra of BMA...

Yu. P. Piryatinskiĭ, O. V. Yaroshchuk, L. A. Dolgov, T. V. Bidna… in Optics and Spectroscopy (2004)

Article

Spectral Characteristics and Surface Morphology of Organic Polymer Films Containing Vanadium Pentoxide Nanoparticles

Films of nanosized composites of poly(N-epoxypropylcarbazole) (pEPC) and poly(3,6-di-Br-N-epoxypropylcarbazole) (pdBEPC) with vanadium pentoxide (V₂O₅) are produced for the first time ever. The electroconduction ...

S. V. Svechnikov, V. D. Pokhodenko, N. F. Guba… in Russian Journal of Electrochemistry (2004)

Article

Transient photocurrent and photoluminescence in porous silicon

Transient photocurrent in porous silicon samples subjected to prolonged storage in air has been studied using the time-of-flight technique at temperatures in the range 300–350 K and electric field strengths of 10

N. S. Averkiev, L. P. Kazakova, Yu. P. Piryatinskii, N. N. Smirnova in Semiconductors (2003)

Article

Fluorescence Properties of Thiacarbocyanine Dyes at Low Temperatures

Measurements were carried out for time-resolved fluorescence spectra of dye solutions containing thiacarbocyanine and its derivatives with ethylene and vinylene bridges in the polymethine chain. At low tempera...

Yu. P. Piryatinskii, V. G. Nazarenko… in Theoretical and Experimental Chemistry (2003)

Article

Optical absorption and luminescent properties of melanin films

The optical absorption and luminescence spectra of the films of natural melanin were measured. The results are explained based on a nanocluster structure of the films.

V. P. Grishchuk, S. A. Davidenko, I. D. Zholner… in Technical Physics Letters (2002)

Article

Orientation of pentyl-cyanobiphenyl layers and variations in their luminescence spectra under UV irradiation

Polarized fluorescence spectra of layers of a nematic liquid crystal (LC) of n-pentyl-n′-cyanobiphenyl (5CB), oriented by two different methods, namely, by rubbing the polyimide-coated substrates holding the LC l...

Yu. P. Piryatinskiĭ, O. V. Yaroshchuk in Optics and Spectroscopy (2002)

Article

Photoluminescence of pentyl-cyanobiphenyl in liquid-crystal and solid-crystal states

The stationary and time-resolved photoluminescence spectra of n-pentyl-n′-cyanobiphenyl (5CB) are studied in a mesophase and solid-crystal state. The photoluminescence spectra of 5CB are determined by the molecul...

Yu. P. Piryatinskiĭ, O. V. Yaroshchuk in Optics and Spectroscopy (2000)

Article

Photoluminescence of porous silicon layers formed in ion-implanted silicon wafers

Implantation of the B⁺ and N⁺ ions or a B⁺ + N⁺ combination into silicon substrates affects the photoluminescence properties of porous silicon (por-Si) layers prepared on the ion-modified wafers. The postimplanta...

Yu. P. Piryatinskii, N. I. Klyui, A. G. Rozhin in Technical Physics Letters (2000)

Article

Controllable electrochromic effect in a liquid-crystal cell with J aggregates

It is shown that organic nanocrystals (J aggregates) can be successfully produced and oriented in a liquid-crystal matrix. An external electric field can reorient and destroy them.

Yu. P. Piryatinskii, V. G. Nazarenko, O. V. Yatsun in Technical Physics Letters (1999)

Article

Photoluminescence of porous-silicon/diamondlike-carbon-film structures subjected to rapid thermal annealing

The influence of rapid thermal annealing on the photoluminescence properties of porous-silicon/diamondlike-carbon-film structures is investigated. Redistribution of the radiation from the long-wavelength to th...

A. G. Rozhin, N. I. Klyui, Yu. P. Piryatinskii… in Technical Physics Letters (1999)

Article

Distinctive features of time-resolved photoluminescence of porous silicon coated with a layer of diamondlike carbon

Time-resolved photoluminescence from porous silicon coated with a diamondlike carbon film is investigated. The intensity of the photoluminescence from the carbon film is obserd to increase after deposition, an...

Yu. P. Piryatinskii, V. A. Semenovich, N. I. Klyui, A. G. Rozhin in Technical Physics (1998)

Article

Nature and kinetics of the self-quenching of excited states of chromium(VI) oxyanions

Absorption and emission spectroscopy, utilizing theoretical group analysis, was used to investigate the nature of triplet states of chrornate and bichromate ions in aqueous solutions. The complex kinetics obse...

N. A. Kondratenko, Yu. P. Piryatinskii… in Theoretical and Experimental Chemistry (1995)

Article

Influence of structural order on absorption spectra of langmuir-blodgett films of vanadyl phthalocyanine

Yu. P. Piryatinskii, O. V. Yatsun in Journal of Applied Spectroscopy (1994)

Article

Luminescence of poly-N-epoxypropylcarbazole

Yu. P. Piryatinskii, V. N. Yashchuk, Yu. A. Cherkasov… in Journal of Applied Spectroscopy (1990)

Article

Analysis of the crystalline and molecular structures of solid films of 2,2′-diamino-1,1′-dinaphthyl

M. V. Kurik, Yu. P. Piryatinskii, G. M. Pleshkov… in Journal of Applied Spectroscopy (1976)