Tm3+,Yb3+共掺钨酸钙多晶材料的上转换发光及荧光温度特性

采用高温固相法制备了Tm³⁺，Yb³共掺CaWO₄多晶材料. 980 nm二极管激光器激发下，在可见区获得了¹G₄→³H₆，¹G₄→³H₄，³H₂，³H₃→³H₆ 跃迁产生的上转换荧光. 讨论了Yb³⁺ 离子浓度的变化对Tm³⁺ 的上转换发光强度的影响，同时根据荧光强度比的方法研究了689 和705 nm 红色上转换荧光在313–773 K 范围内的温度特性. 结果表明：基于Tm³⁺，Yb³⁺ 共掺CaWO₄ 多晶材料的红色上转换荧光可以实现温度监测，其测温的最大灵敏度值为5.7×10^-4 K^-1，相应的测量温度为458 K. 关键词： 上转换发光 3+')" href="#">Tm³⁺ 钨酸钙 荧光温度传感

Up-conversion luminescence and temperature characteristics of Tm3+, Yb3+ co-doped CaWO4 polycrystal material

Tm³⁺, Yb³⁺ co-doped CaWO₄ polycrystals are synthesized via the high temperature solid state method. Under excitation of a 980 nm laser, the up-conversion fluorescences based on the transitions ¹G₄→³H₆, ¹G₄→³H₄, ³H₂→³H₆ and ³H₃→³H₆ in the visible light region are successfully obtained. The effect of the concentration change of Yb³⁺ on the luminous intensity of Tm³⁺ is discussed. Meanwhile, the temperature properties of the red up-conversion fluorescences centered at 689 nm and 705 nm are studied in a tem-perature range between 313 and 773 K according to the fluorescence intensity ratio method. It is found that the temperature can be monitored by detecting the red up-converion fluorescences of Tm³⁺, Yb³⁺ co-doped CaWO₄ polycrystals. The maximal sensitivity of temperature measurement can be achieved to be 5.7×10^-4 K^-1 at 458 K.
Keywords： up-conversion fluorescence 3+')" href="#">Tm³⁺ 4')" href="#">CaWO₄ fluorescence intensity ratio