Abstract

Using pulsed laser techniques, we have performed high-resolution excitation spectroscopy experiments on the luminescence of the oxygen center in ZnTe. These experiments were initiated to investigate the conjecture that free excitions are directly captured at oxygen impurities⁽¹⁾. The luminescence measurements were made for laser wavelengths varying from the bound-exciton zero-phonon absorption line to well above the band gap of ZnTe. A typical luminescence spectrum obtained at 10k with the pump laser tuned to the one phonon absorption peak is shown in the accompanying figure. When the laser was tuned to the free-exciton band, we found that the oxygen luminescence was enhanced. This result confirms the earlier conjecture of free exciton capture.

© 1984 Optical Society of America