White up-conversion emission in Ho/Tm/Yb tri-doped glass ceramics embedding BaF2 nanocrystals |
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| Authors: | Chenxia Li Shiqing Xu Rengguang YeDegang Deng Youjie HuaShilong Zhao Songlin Zhuang |
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| Affiliation: | a College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China
b Optical and Electronic Information Engineering College, University of Shanghai for Science and Technology, Shanghai 200093, China |
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| Abstract: | Ho3+/Tm3+/Yb3+ tri-doped glass ceramics with white light emitting have been developed and demonstrated. Pumped by 980 nm laser diode (LD), intensive red, green and blue up-conversions (UC) were obtained. The green emission is assigned to Ho3+ ion and the blue emission is assigned to Tm3+ ion, whereas the red emission is the combination contribution of the Ho3+ and Tm3+ ions. The RGB intensities could be adjusted by tuning the rare-earth ion concentration and pump power intensity. Thus, multicolor of the luminescence, including perfect white light with CIE-X=0.329 and CIE-Y=0.342 in the 1931 CIE chromaticity diagram can be obtained in 0.15 Ho3+/0.2Tm3+/3Yb3+ tri-doped glass ceramics embedding BaF2 nanocrystals pumped by a single infrared laser diode source of 980 nm at 500 mW. The up-conversion luminescence mechanism of Yb3+ sensitize Ho3+ and Tm3+ ions and the energy transfer from Ho3+ to Tm3+ in oxy-fluoride silicate glass ceramics were analyzed. |
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| Keywords: | Oxy-fluoride glass ceramics Ho3+/Tm3+/Yb3+ tri-doped Up-conversion luminescence |
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