High-quality Er3+: ZnO films were grown by the pulsed-laser deposition technique for 0.5 and 2wt. % Er doping. Two peaks were observed at approximately 1.54 μm in the photoluminescence spectra of samples with 2 wt. % doping contrary to only one peak in the 0.5 wt. % 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 Er3+ ions in the form of ErO6 clusters, which are optically active centers in the ZnO matrix. These results are very important for designing waveguides for telecommunications.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics