Upconverted photoluminescence in Ho3+ and Yb3+ codoped Gd2O3 nanocrystals with and without Li+ ions |
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| Authors: | Yutao Jia Yinglin Song Yunfeng Bai Yuxiao Wang |
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| Institution: | 1. School of Physical Science and Technology, Soochow University, Suzhou 215006, China;2. Department of Physics, Harbin Institute of Technology, Harbin 15001, China;3. School of Optoelectronics, Beijing Institute of Technology, Beijing 100086, China |
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| Abstract: | The upconversion photoluminescence of Ho3+ ion sensitized by Yb3+ ion in Ho3+/Yb3+codoped Gd2O3 nanocrystals with and without Li+ is investigated in this paper. Strong fluorescence in the green (534–570 nm) and red (635–674 nm) regions of the spectrum has been observed, arising from the 5F4/5S2 → 5I8 and 5F5 → 5I8 transitions of Ho3+ ion, respectively. Yb3+ ion is considered to be a better sensitizer for catching enough pumping energy and transferring considerable energy to Ho3+ in the Ho3+/Yb3+system. The upconversion intensity emitted by Ho3+ is greatly enhanced when Li+ is added to the Ho3+/Yb3+ codoped Gd2O3 nanocrystals. |
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| Keywords: | upconversion luminescence nanocrystal rare earth |
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