EFFECT OF TEMPERATURE, DOPING CONCENTRATION ON OPTICAL PROPERTIES OF ZNO NANOPARTICLES AND Er3+ IONS CO- DOPED SILICA
This work reports on SiO2 thin films co-doped with ZnO nanoparticles and Er3+ ions prepared by sol- gel method and spin- coating process. After growth, heat treatment processes in the air at the annealing temperatures of 600 oC, 700 oC, 800 oC, 900 oC and 1000 oC for 3h have been applied for calcination. Scanning electron microscopic images showed that ZnO nanoparticles dispersed in a thin layer of SiO2 are formed with diameter in the range of about 20-30 nm. The characteristic emission band at 1540 nm from intra-4f electronic shell of Er3+ ions can be observed. We found that these PL spectra depend on annealing temperature, Er doping concentration and ZnO content. It can explained by the energy transfer from ZnO nanocrystals to Er3+ dopants.
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