J. Phys. IV France 01 (1991) C7-323-C7-326
SPECTROSCOPIC PROPERTIES OF Ca-SUBSTITUTED GADOLINIUM GALLIUM GARNET DOPED WITH V4+A. SUCHOCKI1, 2, A. BRENIER1, C. PEDRINI1 and G. BOULON1
1 URA 442 CNRS, University Lyon, 43 boulevard du 11 novembre 1918, F-69622 Villeurbanne cedex, France
2 Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, PL-02-668 Warszawa, Poland
The results of absorption, luminescence and luminescence excitation, fluorescence decay kinetics and photoconductivity measurements of Gd3Ga5O12 : V4+, Ca2+ (0.5% mol.) garnet are reported in detail. A strong quenching of the luminescence of V4+ ions in octahedral sites by the energy transfer to V4+ ions in tetrahedral sites is observed. Broad, strong bands observed in absorption and luminescence excitation spectra of octahedral V4+ ions in the ultraviolet region are assigned to small polarons bound at the V4+ ions in octahedral sites.
© EDP Sciences 1991