The region of the edge emission spectrum of CdS(O) single crystals with cadmium excess is examined. An anomalous series of equidistant bands with leading line at 514 nm and phonon replicas has been revealed. These bands grow in intensity with increase of the excitation density up to 1026–1027 cm–3⋅s–1 at 80 K, and the leading line of the series is observed even at 300 K. It is shown that luminescence is conditioned by the exciton spectrum in perfect bulk single-crystals of CdO. Some characteristics of this spectrum are presented, in particular, the dependence on temperature, excitation intensity, composition and size of the crystals, and the LO interaction. The results experimentally confirm the theoretically calculated magnitude of the direct band gap of CdO.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 10, pp. 122–126, October, 2014.
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Morozova, N.K., Kanakhin, A.A., Galstyan, V.G. et al. Anomalous Series of Bands in the Edge Emission Spectra of CdS(О). Russ Phys J 57, 1436–1441 (2015). https://doi.org/10.1007/s11182-015-0400-5
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DOI: https://doi.org/10.1007/s11182-015-0400-5