【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¹G_4（a）与¹G_4（b）和³F_2,3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。¹G_4（a）与¹G_4（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;³F_2,3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。更多还原

【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, ³F_2,3→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 ¹G_4（a）, ¹G_4（b） and ³F_2,3, 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 ¹G_4（a） and ¹G_4（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 ³F_2,3 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.更多还原