Enhancement of the upconversion luminescence in Y_2O_3:Er~(3+) powders by codoping with La~(3+) ions

• 作 者: 雷若姗 王焕平 徐时清 田颖 黄立辉
• 机 构: College of Materials Science and Engineering, China Jiliang University,
• 出 处: Chinese Optics Letters
• 发表日期: 2015年02期
• 关键词: powders ions Infrared luminescence luminescent attributed symmetry visible decre

Infrared-to-visible upconverted luminescent spectra of Er3 t and La3 t codoped Y2O3 powders are investigated.By introducing La3 t ions, the upconversion green radiation is found to be greatly enhanced when compared with the powders with La3 t absent. Such enhancement can be attributed to the modification of the local symmetry surrounding the Er3 t ion, which benefits the intra-4f transitions of Er3 t ion, and the decreasing interaction between Er3 t ions, which suppresses the energy transfer process4F7∕2t 4I11∕2→ 4F9∕2t 4F9∕2.

Infrared-to-visible upconverted luminescent spectra of Er3t and La3t codoped Y2O3 powders are investigated. By introducing La3t ions, the upconversion green radiation is found to be greatly enhanced when compared with the powders with La3t absent. Such enhancement can be attributed to the modification of the local symmetry surrounding the Er3t ion, which benefits the intra-4f transitions of Er3t ion, and the decreasing interaction between Er3t ions, which suppresses the energy transfer process4F7 / 2t 4I11 / 2 → 4F9 / 2t 4F9 / 2.