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Your search keyword '"Spassky, D."' showing total 5 results
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5 results on '"Spassky, D."'

1. Luminescent properties of $MgWO_4$ crystals

Author

Krutyak, N., Mikhailin, Vitali, Spassky, D., Tupitsyna, I. A., and Dubovik, A. M.

Subjects
Condensed Matter::Materials Science, Condensed Matter::Other, Physics::Atomic and Molecular Clusters
Abstract

Luminescent properties of magnesium tungstate were investigated. Two samples of MgWO4 single crystals grown by different methods were studied. Only intrinsic luminescence attributed to exciton emission was detected for the both samples and. It was shown that the temperature dependence of the low-energy edge in the excitation spectra obeys Urbach rule. Steepness coefficient that was deduced from this dependence indicates self-trapping of excitons in MgWO4. The absence of cation d states in the valence band is a distinctive feature of MgWO4 that is shown to be manifested in the luminescence excitation spectra.

Published
2012

5. Intrinsic and Ce3+-Related Luminescence in Single Crystalline Films and Single Crystals of LuAP and LuAP:Ce Perovskites.

Author

Zorenko, Yu., Gorbenko, V., Voznyak, T., Mikhailin, V., Kolobanov, V., Spassky, D., and Nikl, M.

Subjects
LUMINESCENCE, CRYSTALS, PEROVSKITE, SPECTRUM analysis, RADIATION, SYNCHROTRONS
Abstract

Intrinsic and Ce-related luminescence of LuAP:Ce single crystalline films (SCF) in comparison with their bulk single crystal (SC) analogs were analyzed for the first time using the time-resolved luminescence spectroscopy under synchrotron radiation excitation. Difference in luminescent properties of SCF and SC are due to the absence of the Lu-at-Al-site antisite defects (AD) and extremely low concentration of vacancy-type defects (VD) in SCF. SCF contamination by Pb ions from flux is noted, which gives rise to an additional emission band in UV range. In SCF, the absence of emission and trapping centers formed by the mentioned AD and VD can explain their favorable timing characteristics with respect to SC. The role of Pb2+ trace impurities in LuAP-based SCF scintillators is considered as well. [ABSTRACT FROM AUTHOR]

Published
2008
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