Abstract
Infrared-to-visible upconversion luminescence spectra were investigated in Er 3+ doped and Er 3+–Li + codoped BaTiO 3 nanocrystals following excitation with 976 nm. By introducing Li + ions, the upconverted emission intensity is found to be greatly enhanced compared to that of the nanocrystals without Li + ions. The enhanced luminescence might be attributed to the oxygen vacancy generated by Li + ion incorporation in the lattices and the distortion of the local asymmetry around Er 3+. We observe that excitation power dependence and decay time are increased by the incorporation of Li + ions. Li + ions also can reduce the OH groups in specimen, which decrease nonradiative decay from the 4S 3/2 to 4F 9/2, enhancing the upconversion emission intensities.
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