Sheng Chenxu, Li Xiangping, Tian Yu, Wang Xin, Xu Sai, Yu Hongquan, Cao Yongze, Chen Baojiu
School of Science, Dalian Maritime University, Dalian, Liaoning 116026, PR China.
School of Science, Dalian Maritime University, Dalian, Liaoning 116026, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2021 Jan 5;244:118846. doi: 10.1016/j.saa.2020.118846. Epub 2020 Aug 17.
LaNbO: Nd/Yb/Ho phosphor was prepared by a conventional high temperature solid-state reaction method. The temperature dependence of up-conversion (UC) luminescence property of LaNbO: Nd/Yb/Ho phosphor under 808 nm excitation and the potential application of exploiting the red-to-green UC emission intensity ratio (I/I) of Ho in temperature sensing were studied. Two-photon processes were confirmed to be responsible for both the green and the red UC emissions at different temperatures by analyzing the excitation power density dependent UC luminescence spectra measured at different temperatures. The energy level diagram was drawn to analyze the UC luminescence mechanism of Ho. In addition, it was found that the ratio I/I of Ho was independent of the excitation power density of 808 nm laser under the current experimental condition, but it was sensitive to the temperature. And the temperature dependent UC luminescence spectra displayed that the ratio I/I exhibited a good linear increasing tendency with temperature rising. The obtained temperature sensing sensitivity was 2.04 × 10 K in the temperature range of 303-693 K. The results suggest that LaNbO: Nd/Yb/Ho phosphor may be a good candidate for application in optical temperature sensors.
采用传统高温固相反应法制备了LaNbO:Nd/Yb/Ho荧光粉。研究了LaNbO:Nd/Yb/Ho荧光粉在808 nm激发下的上转换（UC）发光性能的温度依赖性，以及利用Ho的红到绿UC发射强度比（I/I）在温度传感中的潜在应用。通过分析在不同温度下测量的与激发功率密度相关的UC发光光谱，证实了双光子过程是不同温度下绿色和红色UC发射的原因。绘制了能级图以分析Ho的UC发光机制。此外，发现在当前实验条件下，Ho的I/I比与808 nm激光的激发功率密度无关，但对温度敏感。与温度相关的UC发光光谱显示，I/I比随温度升高呈现良好的线性增加趋势。在303 - 693 K温度范围内获得的温度传感灵敏度为2.04×10 K。结果表明，LaNbO:Nd/Yb/Ho荧光粉可能是光学温度传感器应用的良好候选材料。
