Published online by Cambridge University Press: 17 March 2011
Site-selective photolumiescence (PL) and photoluminescence excitation (PLE) spectroscopies have been carried out at 6 K on the ∼1540nm 41/32 → 4I1/52 Er3+ transition in in-situ-doped GaN:Er which have detected nine differenct Er3+ sites and associated PL spectra. Three distinct Er3+ sites are identified in the in-situ-doped samples. For the in-situ-doped samples, the concentration of the various Er+3 sites are comparable while for the ion-implanted sample, the concertration of one Er3+ site was higher than the concentration of the other sites. In-situ-doped samples grown with different Ex-cell temperatures were considered, and the width of the PLE spectrum appears to be a function of the Er-cell temperature.