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Effects of alkali metal ions on upconversion photoluminescence intensity of Er3+-doped Y2O3 nanocrystals |
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| Authors: | Lu Liu Yuxiao Wang Yunfeng Bai Xueru Zhang Kun Yang Yinglin Song |
| Institution: | 1. Department of Physics, Harbin Institute of Technology, Harbin, 150001, People’s Republic of China 3. School of Science, Harbin Engineering University, Harbin, 150001, People’s Republic of China 2. School of Physical Science and Technology, Soochow University, Soochow, 215006, People’s Republic of China |
| Abstract: | We investigate upconversion emissions in alkali metal ions (Li+, Na+, and K+) and Er3+-codoped Y2O3 nanocrystals. By introducing Li+, upconversion intensity is significantly enhanced, while Na+ and K+ hardly have this influence. FT-IR data give evidence that the main mechanisms of the enhanced upconversion emission cannot be attributed to the decreased surface defects. EXAFS data and variations of enhanced upconversion intensities in different samples indicate that Li+ can occupy the interstitial sites in lattice and thus arouse large site asymmetry. In addition, locations in the samples and effects on the upconversion emission of Na+ and K+ are discussed. |
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