Publication Details:
Journal or Publication Title:
Armenian Journal of Physics=Ֆիզիկայի հայկական հանդես
Date of publication:
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Creator:
M. Mkrtchyan ; T. I. Butaeva ; A. Eganyan ; K. Ovanesyan
Corporate Creators:
Institute for Physical Research of NAS RA ; Armenian State Pedagogical University after Khachatur Abovyan ; National Scientific Laboratory, Yerevan, Armenia
Subject:
Physics ; Optics ; Electronic transport in condensed matter
Coverage:
Abstract:
The results of a spectral study of both unalloyed and cerium-doped gadolinium-gallium garnet single crystals (GGG and GGG:Ce) are presented.. The effect of the content of activator ions on the absorption properties of these crystals in the region of 4f-5d transitions of Ce3+ ions were considered. Four different photoluminescence bands of Ce3+ ions were obtained in a GGG:Ce (0.1%) crystal, whose wavelengths are determined by the excitation region of the activator absorption bands. It was shown that the presence of at least four main dodecahedral centers of Ce3+ ions in crystals allows one to explain the concentration shift of the activator absorption bands and the mechanism of formation of luminescence bands. Scintillation emission with a maximum at 550 nm was obtained in GGG:Ce (0.03 and 0.3%) crystals upon their excitation by X-ray radiation (22.163 keV).