The optical properties of GeGaSe glasses doped with Er by the addition of Er2S3 have been investigated. Optically uniform glasses have been prepared using stoichiometric compositions with 9–12 at.% Ga and doped with 0.5–2 at.% Er. The radiative lifetime of the 4I13/2 → 4I15/2 transition has been estimated to be equal to 1.78 ms using the Judd–Ofelt analysis. The photoluminescence lifetime distribution has been investigated in optimized glasses using Quadrature Frequency-Resolved Spectroscopy at room and liquid helium temperatures and at different emission wavelengths. All lifetime distributions were found to be sharp peaks centered at ~2 ms. A radiation diffusion model has been used to understand the discrepancy between measured photoluminescence spectra and those predicted by the McCumber theory. The model predicts a radiative lifetime of the 4I13/2 → 4I15/2 transition to be around 1.72 ms and a much longer non-radiative lifetime. These results assume quasi-uniform distribution of Er3+ ions with negligible concentration-self-quenching and negligible rate of non-radiative relaxation from 4I13/2 to 4I15/2.
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