Influence of oxygen on Er-related emission in GaN with a large yellow band

摘要

In order to investigate the luminescence properties of Er~(3+) in GaN and the effect of oxygen (O) on Er~(3+) - related emission in GaN:Er, erbium (Er) ions were implanted into single-crystal h-GaN grown on a c-axis sapphire substrate at an energy of 2MeV. Oxygen ions were subsequently coimplanted into GaN with Er ions. The influence of oxygen on Er-related emission in GaN with a large yellow band was studied by comparing photoluminescence (PL) measurements of GaN:Er, O. It was found that the optimum annealing temperature to obtain maximum PL intensity was 1200 deg and that the Er~(3+)-related PL intensities from GaN:Er, O samples were negligibly enhanced in comparison with the GaN:Er samples. The temperature dependence of PL intensity in GaN:Er,O showed no appreciable difference from that of GaN:Er. But good correlation between Er-related and a large yellow band emission was observed in GaN. This indicates that codoped oxygen ions influence Er-related and yellow band emission in GaN.