Absorption, luminescence excitation, and infrared transmittance spectra of ZnS(O)-ZnSe(O) crystals in the context of the band anticrossing theory

Abstract

The paper reports the results of optical studies of the absorption, luminescence excitation, and infrared transmittance spectra for the set of ZnS(O)-ZnSe(O) alloys with highly inconsistent properties of anions. It is shown that the band anticrossing theory applied to the alloys provides a general interpretation of their specific optical properties not properly understood previously. A band model of transitions with absorption in a complex multiband formed due to oxygen is presented. The specific features of the absorption and luminescence excitation spectra are interpreted to gain an insight into the distribution and states of oxygen in the crystals. The effect of oxygen on the transmittance band of the ZnS-ZnSe alloys in the near-infrared spectral region is considered. A new approach to the interpretation of the infrared absorption bands associated with oxygen is developed. The calculation algorithms that provide a means for determining the spectral position of the bands in relation to the dissolved oxygen content are suggested.