Abstract

Nonequilibrium excited vibronic states of Cr4+ ions in Mg2GeO4 were studied with the upconverted hot-luminescence technique. From the discrete spectral peaks observed, information on the nonradiative relaxation of the Cr4+ ions was obtained. The phonon modes involved in the nonradiative relaxation were measured to be ω1=451±20 cm-1, ω2=342±20 cm-1, and ω3=252±20 cm-1. The experiment also shows the presence of an electronic bottleneck centered at 2.1 eV. These findings are compared with results previously obtained in Cr4+-doped Mg2SiO4 and provide information on the nonradiative relaxation of the same ion in different host crystals.

© 1996 Optical Society of America

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