Influence of doping rate in Er3+:ZnO films on emission characteristics.
High-quality Er(3+):ZnO films were grown by the pulsed-laser deposition technique for 0.5 and 2 wt. % Er doping. Two peaks were observed at approximately 1.54 microm 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 Er(3+) ions in the form of ErO(6) clusters, which are optically active centers in the ZnO matrix. These results are very important for designing waveguides for telecommunications.
Douglas
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Center for Materials Research, Norfolk State University, 700 Park Avenue, Norfolk, Virginia 23504, USA.
Mundle
R
R
Konda
R
R
Bonner
C E
CE
Pradhan
A K
AK
Sahu
D R
DR
Huang
J-L
JL