Opallike materials based on tin dioxide were pr epared, and their structural and sensor character� istics were studied. The optical transmission spectra of opallike structures based on SnO 2 were recorded, and the volume fraction occupied in them by tin dioxide was estimated. It was shown that structures based on SnO2 contained a photon stopzone in the visible spect rum range. The sensor properties of the materials toward CO and H2 were studied over the temperature range 375-425°C. The SnO2 samples studied had much higher sensitivity to CO compared with SnO2 materials without opallike structures.

Tin dioxide

Optical spectra

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Исследование структурных и оптических свойств пленочных фотонных кристаллов на основе микросфер SiO2

S. A. Bondarenko Е. А. Бондаренко Н. И. Каргин L. V. Mikhnev S. O. Klimonskii

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Direct observation of intramolecular charge transfer on photoexcitation

Dokl. Phys. Chem. (Engl. Transl.); (United States) (1986)

L. M. Blinov V. T. Lazareva L. V. Mikhnev S. G. Yudin

The authors construct a model for determining photostimulated charge transfer in organic macromolecules based on molecules with a high value of photoexcitation and a sufficiently long lifetime of the photoexcited state owing to intersystem crossing to the triplet state. In this connection the change in the dipole moment of the molecules during the transition from the ground state to the photoexcited state was determined using measurements of the Stark effect for isotropic polymeric solutions. In addition a long hydrocarbon tail was fastened to the molecules to make it possible to use the Blodgett-Langmuir technique to prepare solid multimolecular layers with a given molecular orientation. The multilayer is placed between two semitransparent aluminium electrodes in order to record the electrical signal during exposure to light along with the photoelectromotive force.

Photoexcitation

Intersystem crossing

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Study intra-4f transitions of Sm3+ ions under direct photoexcitation in TiO2

IOP Conference Series Materials Science and Engineering (2019)

О.М. Chapura L. V. Mikhnev Е. А. Бондаренко Антон А. Скоморохов R A Goncharov

A systematic study of photoluminescence transitions of samarium ion (Sm3+) incorporated in titanium dioxide (TiO2) powder with anatase structure has been performed. Perceptible changes of luminescence under direct excitation as compared with indirect excitation of Sm3+ in titanium dioxide (TiO2:Sm3+) have been detected. Measurements of photoluminescence excitation spectra for all detected radiative transition of Sm3+ were accomplished. The values of asymmetry ratio were calculated for different excitation wavelengths. The dependence of luminescent intensity on Sm3+ doping concentration in TiO2 host was studied under direct and indirect excitation. Thus, evidences of the existence of the several Sm3+ sites in anatase TiO2 have been presented in this work.

Photoexcitation

Titanium Dioxide

Photoluminescence excitation

10.1088/1757-899x/597/1/012052

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Study into luminescence and photoconductivity of nano-structured ZnO obtained through sol-gel method

IOP Conference Series Materials Science and Engineering (2019)

L. V. Mikhnev Е. А. Бондаренко О.М. Chapura Антон А. Скоморохов Alexander Ivanovich Nikonov

Abstract Sol-gel method from zinc acetate in water was employed to synthesize nano-sized zinc oxide. The structural features of the ZnO obtained samples, their spectral features of luminescence and photoconductivity were studied. The influence of the treatment temperature on the luminescence and photoconductivity of nano-sized zinc oxide was studied. The type and energy position of the intrinsic defects involved in the luminescence and photoconductivity processes were determined.

Photoconductivity

10.1088/1757-899x/597/1/012051

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Influence of scandium on luminescence YSAG:Yb³⁺

Journal of Physics Conference Series (2021)

D M Revenko О.М. Chapura Е. А. Бондаренко L. V. Mikhnev D L Gazdinsky

Abstract In this work, the effects of scandium introduction on the luminescence of yttrium scandium (Sc) aluminium garnet powders doped with ytterbium (YSAG: Yb 3+ ) were investigated. Based on photoluminescence (PL) and photoluminescence excitation (PLE) spectra we made conclusions about the influence of scandium concentration and location on emission properties of ytterbium ions in YSAG. On the one hand, an analysis of the data showed that the increase of Sc concentration leads to broadening spectral lines regardless of a location of scandium ions in the crystal structure. On the other hand, the photoluminescence intensity of ytterbium ions in YSAG is more sensitive to scandium in the octahedral site than to scandium in the dodecahedral site.

Scandium

Ytterbium

Photoluminescence excitation

10.1088/1742-6596/1989/1/012017

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The optical and gas-sensitive properties of opal-like structures based on SnO2

Russian Journal of Physical Chemistry A (2012)

Е. А. Бондаренко Світлана Бондаренко Н. И. Каргин В. Ф. Громов Т. В. Белышева

Tin dioxide

Visible spectrum

10.1134/s0036024412060064

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