Analysis ofp−nLuminescence in Zn-Doped GaP

Abstract

$p-n$ luminescence and photoluminescence of Zn-doped GaP are investigated. Spectral distributions and the light output as a function of temperature and excitation density are recorded. The light output of the $p-n$ luminescence shows a strongly superlinear dependence on excitation density. With rising temperature, the superlinear range shifts to higher excitation densities. Using a three-level model the recombination kinetics are analyzed with the aid of the Klasens code-number method. The analysis given allows an interpretation of the superlinearity and gives a quantitative explanation of the observed shift of the superlinear range with temperature.