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Near-infrared Light-mediated Er3+ and Yb3+ co-doped CaTi4O9 for Optical Temperature Sensing Behavior
Journal of Luminescence ( IF 3.6 ) Pub Date : 2021-05-01 , DOI: 10.1016/j.jlumin.2020.117737
Prashansha Singh , Neha Jain , Anish Kumar Tiwari , Shraddha Shukla , Vikas Baranwal , Jai Singh , Avinash C. Pandey

Abstract In present report, CaTi4O9: 1 at% Er3+, 1 at% Yb3+ phosphors have been synthesized via sol-gel method and reported herein for its temperature sensing performance. XRD spectra confirms high crystallinity and successful inclusion of rare earth (RE) ions into CaTi4O9 as the dopant ions do no induce any change in the peak position. The X-ray diffraction analysis indicates that the host calcium titanate exhibits hexagonal crystal structure. The green up-conversion (UC) emission observed using 980nm diode laser excitation. Since, Er3+ ion has ladder type energy levels, thereby it receives energy from Yb3+ ion by excited state absorption and energy-transfer up-conversion processes. Furthermore, the Er3+ion has two temperature sensing levels 4S3/2→4I15/2 (550 nm) and 2H11/2→4I15/2 (525 nm). Therefore, temperature dependent up-conversion spectra illustrate good temperature sensitivity for present phosphor. The sensitivity of above mentioned phosphor has been evaluated with temperature from 300K to 500K, which shows the suitability of the phosphor for developments in temperature thermometry.

中文翻译:

近红外光介导的 Er3+ 和 Yb3+ 共掺杂 CaTi4O9 用于光学温度传感行为

摘要 在本报告中,CaTi4O9: 1 at% Er3+, 1 at% Yb3+ 荧光粉已通过溶胶-凝胶法合成,并在本文中报道了其温度传感性能。XRD 谱证实了高结晶度和稀土 (RE) 离子成功包含到 CaTi4O9 中,因为掺杂离子不会引起峰位置的任何变化。X-射线衍射分析表明主体钛酸钙呈现六方晶体结构。使用 980nm 二极管激光激发观察到的绿色上转换 (UC) 发射。由于 Er3+ 离子具有梯形能级,因此它通过激发态吸收和能量转移上转换过程从 Yb3+ 离子接收能量。此外,Er3+ 离子具有两个温度感应水平:4S3/2→4I15/2 (550 nm) 和 2H11/2→4I15/2 (525 nm)。所以,温度相关的上转换光谱说明本磷光体具有良好的温度敏感性。上述荧光粉的灵敏度已在300K至500K的温度范围内进行了评估,这表明该荧光粉适用于温度测温的发展。
更新日期:2021-05-01
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