Tm^(3+),Yb^(3+)共掺钨酸钙多晶材料的上转换发光及荧光温度特性

Up-conversion luminescence and temperature characteristics of Tm^(3+), Yb^(3+) co-doped CaWO_4 polycrystal material

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→3H4,3F2,3F3→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 4K 1,相应的测量温度为458 K.

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 transitions1G4 →3H6,1G4 →3H4,3F2 →3H6 and3F3 →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 4K 1at 458 K.