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Bi3+ assisted enhancement of photoluminescence and thermal sensing of Er3+/Yb3+ co-doped SrGdAlO4 phosphor with unusual stable color
Ceramics International ( IF 5.2 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.ceramint.2020.11.221
Xiangxiang Li , Jiangtao Li , Xiaofang Xu , Li Guan , Xuanlin Li , Ruitong Zhang , Fenghe Wang , Dawei Wang , Zizhong Zhu , Xu Li

Abstract Er3+/Yb3+ co-doped SrGdAlO4 up-conversion phosphors with a tetragonal phase were synthesized using solid state reaction method. The dominant up-conversion luminescent mechanism was deduced through analyzing the power dependencies, energy diagrams and fluorescence lifetimes. It is interesting that the emitting color was almost unchanged when adjusting the dopant contents of Er3+ and Yb3+, excitation power and ambient temperature. The emission intensity and color purity of SrGdAlO4: Er3+, Yb3+ sample can be notably enhanced by introducing Bi3+ ions. X-ray diffraction and band gap analysis illustrated that Bi3+ ions can increase the asymmetric surrounding environment of the SrGdAlO4 host lattice. Simultaneously, the change of microstrain value showed that the host crystalline is affected by Bi3+ ions codoping. Optical temperature sensing performance based on the thermal coupled energy levels 2H11/2 and 4S3/2 of Er3+ ions was evaluated in the visible light region. The absolutely sensitivity of SrGdAlO4: Er3+, Yb3+ and SrGdAlO4: Er3+, Yb3+, Bi3+ are 3.8×10-3 K-1 and 6.1×10-3 K-1 respectively. The results indicated that codoping Bi3+ ions can improve the luminescent intensity of SrGdAlO4: Er3+, Yb3+, but also strengthen its temperature sensing characteristics.

中文翻译:

Bi3+ 辅助增强具有异常稳定颜色的 Er3+/Yb3+ 共掺杂 SrGd​​AlO4 荧光粉的光致发光和热传感

摘要 采用固相反应法合成了具有四方相的Er3+/Yb3+共掺杂SrGdAlO4上转换荧光粉。通过分析功率依赖性、能量图和荧光寿命,推导出占主导地位的上转换发光机制。有趣的是,当调整 Er3+ 和 Yb3+ 的掺杂量、激发功率和环境温度时,发光颜色几乎没有变化。SrGdAlO4: Er3+, Yb3+ 样品的发射强度和色纯度可以通过引入 Bi3+ 离子显着提高。X 射线衍射和带隙分析表明 Bi3+ 离子可以增加 SrGd​​AlO4 主晶格的不对称周围环境。同时,微应变值的变化表明主体晶体受Bi3+离子共掺杂的影响。在可见光区域评估了基于 Er3+ 离子的热耦合能级 2H11/2 和 4S3/2 的光学温度传感性能。SrGdAlO4:Er3+、Yb3+和SrGdAlO4:Er3+、Yb3+、Bi3+的绝对灵敏度分别为3.8×10-3 K-1和6.1×10-3 K-1。结果表明,共掺杂Bi3+离子可以提高SrGdAlO4:Er3+、Yb3+的发光强度,同时增强其温度传感特性。
更新日期:2020-12-01
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