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Upconversion Luminescence and Optical Temperature-Sensing Properties of LaNbO 4 :Yb 3+ /Er 3+ Phosphors
Journal of Electronic Materials ( IF 2.2 ) Pub Date : 2019-11-07 , DOI: 10.1007/s11664-019-07776-5
Xuerui Cheng , Xingbang Dong , Ke Peng , Huanjun Zhang , Yuling Su , Liying Jiang

In recent years, upconversion (UC) luminescence has attracted considerable attention because of its potential application in temperature measurement. In this work, LaNbO4:Er3+/Yb3+ phosphors are synthesized using a solid-state method. The x-ray diffraction patterns show that the phosphors obtained exhibit a single monoclinic structure, and doping does not change the crystal structure. Intense green and red emissions are observed upon 980-nm excitation. The emission intensity varies with the doping concentration, and the best doping concentrations are 1 mol.% and 10 mol.% for Er3+ and Yb3+ ions, respectively. The possible luminescence mechanism is investigated based on the UC emission dependence on pump power. The temperature-sensing ability is also investigated based on the fluorescence intensity ratio between two thermally coupled levels 2H11/2 and 4S3/2. The maximum sensitivity achieved is 0.81% K−1 at around 430 K, suggesting that the phosphor is a potential candidate for temperature sensing applications.

中文翻译:

LaNbO 4:Yb 3+ / Er 3+荧光粉的上转换发光和光学温度传感特性

近年来,上转换(UC)发光由于其在温度测量中的潜在应用而备受关注。在这项工作中,使用固态方法合成了LaNbO 4:Er 3+ / Yb 3+荧光粉。X射线衍射图表明,所获得的磷光体表现出单一的单斜晶结构,并且掺杂不会改变晶体结构。在980 nm激发下观察到强烈的绿色和红色发射光。发射强度随掺杂浓度而变化,对于Er 3+和Yb 3+,最佳掺杂浓度为1 mol。%和10 mol。%离子。基于UC发射对泵浦功率的依赖性,研究了可能的发光机理。还基于两个热耦合能级2 H 11/24 S 3/2之间的荧光强度比来研究温度感测能力。在大约430 K时,获得的最大灵敏度为0.81%K -1,这表明磷光体是温度传感应用的潜在候选者。
更新日期:2019-12-21
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