Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 509, Issue 17, Pages 5336-5340Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.12.212
Keywords
Luminescence; Oxygen vacancy; Local asymmetry; Decay time
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Funding
- Youth Science Foundation of Heilongjiang Province of China [QC07C23]
- Natural Science Foundation of Heilongjiang Province of China [E200905]
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Infrared-to-visible upconversion luminescence spectra were investigated in Er3+ doped and Er3+-Li+ codoped BaTiO3 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 Er3+. 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 S-4(3/2) to F-4(9/2), enhancing the upconversion emission intensities. (C) 2011 Elsevier B. V. All rights reserved.
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