Temperature Dependence of Raman Scattering and Exciton Luminescence Spectra in ZnTe

Abstract

Secondary omission spectra have been studied in p-type ZnTe in the 4.2–170 K temperature range under the band-to-band excitation by an Ar⁺ ion laser. The 1LO, 2LO and 3LO Raman-like lines have been observed besides the free- and bound-exciton luminescence lines and their LO-phonon replicas. Temperature dependences of the line intensity, spectral position and width are compared among various radiation components. The observed temperature quenchings of the Raman-like lines are explained by the increase of the energy denominators in the Raman tensors due to the thermal shift of the exciton energy.