Figure 3. PL spectra of compounds (La2O3)0.07(As2S3)0.90(Er2O3)0.03 and (La2O3)0.05(As2S3)0.90(Er2O3)0.05 (curve 1 and 2, respectively)

From: Photoluminescence and phonon spectrum studies of arsenide sulfide compound doped with rare earth elements