The kinetics of the luminescence of porous glass with CdS inclusions was studied at liquid nitrogen temperature. It is shown that the luminescence decay curves after excitation switching-off are different for different types of glasses. For CdS in matrices with small enough pores, a short-time "flash" of the luminescence was observed after the excitation turn off. Additional doping of the samples with Na2S enhanced the "flash". The flash intensity and duration depended on the exciting photons energy. The effect is interpreted by thermo-optical excitation of electrons.

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