Lu_(2)O_(3)∶Er^(3+)/Yb^(3+)荧光材料的上转换发光及其温度传感特性

Upconversion Luminescence and Temperature Sensing Characteristics of Lu_(2)O_(3):Er^(3+)/Yb^(3+) Phosphor

采用CO_(2)激光区熔法制备了Lu_(2)O_(3)∶0.5%Er^(3+)/x%Yb^(3+)(x=1,3,5)上转换荧光材料。X射线衍射结果表明,所制备的Lu_(2)O_(3)∶Er^(3+)/Yb^(3+)荧光材料具有纯Lu_(2)O_(3)晶相。在980 nm激光激发下,样品发出明亮的上转换荧光。光谱测试结果表明,样品上转换荧光强度和荧光中绿光与红光比例随Yb^(3+)离子浓度改变,当Er^(3+)和Yb^(3+)离子浓度分别为0.5%和3%时,样品上转换荧光强度最强。通过荧光强度比(FIR)技术研究了样品Lu_(2)O_(3)∶0.5%Er^(3+)/3%Yb^(3+)在298~873 K温度范围内上转换荧光温度传感特性,在532.8 K时最大绝对灵敏度为0.0060 K^(-1),在298 K时最大相对灵敏度为0.0090 K^(-1)。结果表明,Lu_(2)O_(3)∶Er^(3+)/Yb^(3+)荧光材料非常适合用于宽温度范围荧光温度传感。

Lu_(2)O_(3)∶0.5%Er^(3+)/x%Yb^(3+)(x=1,3,5)phosphors were prepared by CO_(2) laser zone melting method.X-ray diffraction results showed that all the prepared Lu_(2)O_(3)∶Er^(3+)/Yb^(3+)phosphors have a pure Lu_(2)O_(3) crystal phase.Under the excitation of a 980 nm laser diode,the samples emit bright up-conversion luminescence(UCL).The luminescence intensity and the ratio of green band to red band in luminescence spectra change with Yb^(3+)concentration.Besides,the UCL intensity reaches its maximum value when the doping concentrations of Er^(3+)and Yb^(3+)ions are 0.5%and 3%,respectively.The temperature sensing characteristics of Lu_(2)O_(3)∶0.5%Er^(3+)/3%Yb^(3+)were investigated using fluorescence intensity ratio(FIR)technique from 298 K to 873 K.The maximum absolute sensitivity is 0.0060 K^(-1) at 532.8 K,and the maximum relative sensitivity is 0.0090 K^(-1) at 298 K.The above results indicate that the Lu_(2)O_(3)∶Er^(3+)/Yb^(3+)phosphor is very suitable for wide-range temperature sensing.