The color tunability and mechanism of upconversion emissions in Yb3+ and Er3+ co-doped Y2Ce2O7 phosphors
The color tunability and mechanism of upconversion emissions in Yb3+ and Er3+ co-doped Y2Ce2O7 phosphors
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Yb3 和 Er3 共掺杂 Y2Ce2O7 荧光粉的颜色可调性和上转换发射机制
DOI：
10.1016/j.ijleo.2017.10.021
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发表时间：
2018
期刊：
影响因子：
3.1
通讯作者：
Yang Xiufang
中科院分区：
文献类型：
--
作者：
You Weixiong;Li Jiapeng;Wu Youfusheng;Lai Fengqin;Yang Xiufang
采用溶胶-凝胶法制备了不同Yb 3+和Er 3+掺杂浓度的Y2 Ce 2 O 7粉体。研究了其结构和上转换发光性能。结果表明，所得产物为单一相，结构为立方相。在980 nm激发下，探测到了绿色和红色的上转换发射，发射强度可通过Yb 3+和Er 3+的浓度进行调节。根据4S ~（3/2）、4F ~（9/2）和4 I ~（13/2）能级的发射强度和寿命，对上转换过程的机理进行了评价。结果表明，交叉弛豫是负责的绿色和红色的上转换发光的掺杂浓度的依赖性。
Y2Ce2O7powders doped with different Yb3+and Er3+concentrations were synthesized via the sol-gel method. The structure and upconversion properties were investigated. The results indicated that a single phase was obtained and that the structure was cubic. The green and red upconversion emissions were detected with excitation at 980 nm, and the emission intensities could be tuned by the Yb3+and Er3+concentrations. The mechanism of the upconversion process was evaluated on the basis of the emission intensities and lifetimes of the4S3/2,4F9/2and4I13/2levels. The results demonstrated that cross-relaxation was responsible for the dependence of green and red upconversion emissions on the dopant concentration.