The characteristics of orange (O) luminescence in undoped CdS were examined by observing the energy shift of the emission peak as a function of composition in two kinds of solid solution, CdS x Se1-x and Cd y Zn1-y S. Different behaviors of the O-bands were observed in these solid solutions. The O-emission in CdS is thermally quenched at about 200 K with an activation energy of 0.21 eV. From the results, the emission mechanism was explained as D(donor)-A(acceptor) pair recombination with the donor level 0.21 eV below the bottom of the conduction band and the acceptor level 0.29 eV above the top of the valence band. The donor responsible for the emission seems to be related to native defects such as Cd interstitials or S vacancies.
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Mochizuki et al. (1983) studied this question.
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