Abstract
The photochromic effect in molybdenum-doped sillenites Bi 12GeO 20 (BGO) was studied over the temperature range 4–450 K. The broad photochromic absorption band created under the light illumination could be well approximated to a modified Gaussian dependence characteristic of a small bound polaron. The kinetics of the photochromic thermal bleaching was found to be a temperature activated process. In the limit of the lowest temperatures the photochromic absorption, once created, did not decay during the whole time period of experiment, but it disappeared quickly, with a decay time of 6 ms, for temperatures above 350 K. The experimental results were analyzed with the aid of non-linear kinetic models and the rate constant describing the temperature dependence of the photochromic thermal bleaching was determined.
Published Version
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