Preparation,Luminescence Mechanism and Temperature Sensing Properties of KYb2F7:2％Er3+
The up-conversion luminescent material KYb2F7:2%Er3+was synthesized using the hydrothermal meth-od.The synthesized sample was confirmed to be pure phase with an orthorhombic morphology by X-ray diffraction and scanning electron microscopy.Under 980 nm laser excitation,the sample exhibited two green emission peaks at 527 nm and 543 nm,as well as a dominant red emission peak at 655 nm.The temperature-dependent upconversion(UC)emission spectra showed that the emission intensity at 545 nm and 655 nm exhibited thermal quenching with in-creasing temperature.Based on the mechanism of thermal coupling temperature measurement,the temperature sens-ing performance of 2H11/2→4I11/2 and 4S3/2→4I11/2 thermal coupling energy levels of Er3+was studied,and the luminous intensity ratio(LIR),absolute sensitivity(Sa),relative sensitivity(Sr),temperature uncertainty(δT),and repeat-ability(R)of the luminous thermometer were calculated.The maximum relative sensitivity was 0.99%·K-1 at 313 K,the minimum temperature uncertainty was 0.73 K at 313 K,and the repeatability exceeded 99%,ensuring the reli-ability of the thermometer.All the experimental results indicate that KYb2F7:2%Er3+has potential application value in temperature sensing.
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