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Tm3+/Yb3+共掺LuYO3上转换荧光温度传感特性
Temperature Sensing Characteristics of Up-conversion Luminescence in Tm3+/Yb3+ Co-doped LuYO3 Phosphor
【摘要】 采用CO2激光区熔法制备了LuYO3∶Tm3+(0.3%)-Yb3+(5%)荧光材料。在980 nm激光激发下测量了样品在可见光波段的上转换(UC)荧光光谱,其中1G4→3H6跃迁产生的蓝色上转换荧光发生明显的Stark劈裂。利用荧光强度比(FIR)方法对样品的Stark劈裂能级1G4(a)与1G4(b)和3F2,3与3H4两对热耦合能级的荧光温度传感特性进行研究。结果表明,两对热耦合能级的测温范围为223~723 K。1G4(a)与1G4(b)能级在低温下灵敏度较高,在223 K处有最大绝对灵敏度5.62×10-3 K-1和最大相对灵敏度28.2×10-3 K-1;3F2,3与3H4能级比较适合高温下的温度传感,最大绝对灵敏度为1.44×10-3 K-1(723 K),最大相对灵敏度为4.61×10-3 K-1(516.3 K),表明所制备荧光材料非常适合用于荧光温度传感。
【Abstract】 LuYO3∶Tm3+(0.3%)-Yb3+(5%) phosphor was prepared by CO2 laser zone melting method. Under the excitation of 980 nm laser, the sample exhibits up-conversion luminescence(UCL) corresponding to 1G4→3H6, 1G4→3F4, 3F2,3→3H6, 3H4→3H6 transition in the visible light region, among which obvious Stark splits of luminescence are observed in the blue UCL corresponding to 1G4→3H6 transition. The temperature sensing characteristics of 1G4(a), 1G4(b) and 3F2,3, 3H4 thermally coupled levels(TCLs) are investigated by fluorescence intensity ratio(FIR) method. The results show that the temperature measurement range of the two pairs of TCLs is 223~723 K. The Stark sub-levels 1G4(a) and 1G4(b) have higher sensitivity at low temperatures with maximum absolute sensitivity 5.62×10-3 K-1 and maximum relative sensitivity 28.2×10-3 K-1 at 223 K, the 3F2,3 and 3H4 TCLs are more suitable for high temperature measurement with maximum absolute sensitivity 1.44×10-3 K-1(723 K) and maximum relative sensitivity 4.61×10-3 K-1(516.3 K), indicating that the prepared fluorescent material is very suitable for fluorescent temperature sensing.
【Key words】 Tm3+/Yb3+∶LuYO3; upconversion luminescence; fluorescence intensity ratio(FIR); optical temperature sensing;
- 【文献出处】 发光学报 ,Chinese Journal of Luminescence , 编辑部邮箱 ,2021年12期
- 【分类号】TB34;TP212
- 【被引频次】3
- 【下载频次】384