Experimental results of the thermal quenching of Co2+ intraimpurity 4T2 to 4A2 infrared luminescence in wide-gap II-VI semiconductors are presented. Several theoretical models are discussed and some arguments are given that the observed phenomenon is due to the position of the Co2+ ground-state level in the forbidden gap of a II-VI semiconductor. Values of ionisation energies of Co2+ ions are determined.
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A.P. Radliński (1979) studied this question.
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