We report on photoluminescence ͑PL͒ properties of Er 3+ doped Ga 10 Ge 25 S 65 glass. Experiments were performed using 5 ns laser pulses at 980 nm ͑532 nm͒, in resonance with the 4 I 15/2 → 4 I 11/2 ͑ 4 I 15/2 → 2 H 11/2 ͒ transition of the Er 3+ ions. PL bands were observed from the blue to the near-infrared and the dependence of their intensity as a function of the laser intensity was analyzed. The PL temporal behavior was analyzed through rate equations for the population densities and using the Inokuti-Hirayama model. The results allowed identification of the PL pathways and the characterization of energy transfer processes involving pairs of ions.
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