High-quality films were grown by the pulsed-laser deposition technique for 0.5 and Er doping. Two peaks were observed at approximately in the photoluminescence spectra of samples with doping contrary to only one peak in the doped sample. Both peaks were found to be strongly temperature dependent. The microscopic studies clearly illustrate that the appearance of the additional peak is attributed to the environment of ions in the form of clusters, which are optically active centers in the matrix. These results are very important for designing waveguides for telecommunications.
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