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

• Authors: B. Padlyak , O. Bordun , P. Buchynskii
• 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 80÷300 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

42.70.Ce; 78.60.-b; 76.30.Mi

Discipline

• 42.70.Ce: Glasses, quartz
• 76.30.Mi: Color centers and other defects
• 78.60.-b: Other luminescence and radiative recombination

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1999
• Volume: 95
• Issue: 6
• Pages: 921-929

Dates

published

1999-06

received

1998-07-23

(unknown)

1999-02-02

Contributors

author

B. Padlyak

• Department of Physics, Ivan Franko State University, 50 Dragomanov Str., Lviv 290005, Ukraine

author

O. Bordun

• Department of Physics, Ivan Franko State University, 50 Dragomanov Str., Lviv 290005, Ukraine

author

P. Buchynskii

• Scientific and Industrial Amalgamation "Karat", 202 Stryiska Str., Lviv 290031, Ukraine

Identifiers

DOI

10.12693/APhysPolA.95.921