Preparation and Temperature Sensing Performance Study of K3InF6:Er3+,Yb3+Up-Conversion Uminescent Materials with Double Perovskite Structure
Double perovskite compounds have attracted wide attention due to the advantages of low phonon energy,easy doping with rare earth ions,and stable physicochemical properties. To obtain novel temperature-sensitive up-conversion ma-terials,a series of up-conversion luminescent materials K3InF6:Er3+,Yb3+with double perovskite structure were synthesized by high-temperature solid-phase method in this paper. In addition,the composition,structure and luminescence properties were systematically characterized by X-ray powder diffractometer (XRD),field emission scanning electron microscope (FE-SEM) and fluorescence spectrometer (PL),respectively. The results show that the prepared up-conversion luminescent ma-terials are all double perovskite structure,and the samples emit bright green light under 980 nm laser excitation,and the up-conversion luminescence intensity of the samples is maximized when the ratio of amounts of Er3+and Yb3+are 0.05 and 0.25,respectively. Meanwhile,the up-conversion luminescence mechanism involved in the samples is discussed in detail by measuring the up-conversion luminescence spectra of variable power. The temperature sensing performance of the samples in the range of 303 to 573 K was also investigated based on the fluorescence intensity ratio ( FIR) technique,and a maximum absolute sensitivity of 9.5×10-3 K-1 was obtained when the temperature was 483 K. All the results indicate that K3InF6:Er3+,Yb3+up-conversion luminescent material has high sensitivity and has a promising application in the field of temperature sensing.
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