The luminescence and diffusion behavior of copper impurity in ZnSe has been studied by the substoichiometric isotope dilution analysis and photoluminescence measurements. The copper-green emission is prominent in higher Cu-doped crystals, while the copper-red emission is prominent in lower copper concentration ZnSe. Copper acts as the killer center against the near-band edge blue emission. The characteristics of the recombination centers have been examined for temperature dependence of the emission peak energy and emission intensity as well as excitation spectra. It is clear from the photoluminescence and the substoichiometric isotope dilution analysis that the copper impurity can be removed from ZnSe crystals by Zn heat treatment. The measurements show that the diffusion coefficient of Cu in the undoped and Cu-doped ZnSe in the temperature range above 500°C obeys the relationship D =1.26 × 10 -2 exp (-1.0 eV/kT).
No takes yet. Share an insight, caveat, or question.
Yamaguchi et al. (1978) studied this question.