Spectroscopic ellipsometry and photoluminescence investigation of Zn1–x –yBex Mgy Se and Cd1–x –yBex Zny Se crystals

Optical and luminescence properties of the Bridgman‐grown Cd1–x –y Bex Zny Se and Zn1–x –y Bex Mgy Se crystals are reported. Spectroscopic ellipsometry was employed for determination of spectral dependence of the complex dielectric function ε (E) in the photon energy range 0.75–6.5 eV. Below the absorption edge the refractive indices n (E) of the alloys were modelled using a Sellmeier‐type relation. The excitonic band‐gap energies were estimated from the ellipsometric and photoluminescence measurements. Compositional effects in the ellipsometric and photoluminescence spectra are discussed. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)