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1999 | 95 | 6 | 921-929
Article title

Intrinsic Luminescence of the Undoped Glasses of (CaO-Ga_{2}O_{3}-GeO_{2}) System

Content
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Languages of publication
EN
Abstracts
EN
For the first time the intrinsic luminescence in the undoped (CaO-Ga_{2}O_{3}-GeO_{2}) glasses with different composition has been found and investigated in the 80รท300 K temperature range. The new glasses of high chemical purity and optical quality with stoichiometric composition similar to that in calcium-gallium- germanium garnet (Ca_{3}Ga_{2}Ge_{3}O_{12}), trigonal Ca-gallogermanate (Ca_{3}Ga_{2}Ge_{4}O_{14}), and Ca_{3}Ga_{2}O_{6} crystals were obtained by the high-temperature synthesis method. The luminescence and photoexcitation spectra analysis, supported by EPR spectroscopy data, yields the following results: (i) the UV-excited non-elementary broad emission band with maxima at roughly 500 nm and 420 nm in the (CaO-Ga_{2}O_{3}-GeO_{2}) glasses is due to recombination of ensemble of the transient hole O^{-} centres; (ii) the emission bands with maxima at nearly 380 and 710 nm, which were distinctly revealed in glasses with the Ca_{3}Ga_{2}Ge_{4}O_{14} and Ca_{3}Ga_{2}O_{6} compositions, are assigned to the luminescence of UV-induced electron centres of two different types. Possible models of the luminescence centres in (CaO-Ga_{2}O_{3}-GeO_{2}) glass network are discussed.
Keywords
EN
Publisher

Year
Volume
95
Issue
6
Pages
921-929
Physical description
Dates
published
1999-06
received
1998-07-23
(unknown)
1999-02-02
Contributors
author
  • Department of Physics, Ivan Franko State University, 50 Dragomanov Str., Lviv 290005, Ukraine
author
  • Department of Physics, Ivan Franko State University, 50 Dragomanov Str., Lviv 290005, Ukraine
author
  • Scientific and Industrial Amalgamation "Karat", 202 Stryiska Str., Lviv 290031, Ukraine
References
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv95z605kz
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