Optical Temperature Sensing Performance Based on Yb3+/Er3+/Tm3+Triple-doped Ba3In2F12 Phosphor
Upconversion luminescent materials have unique advantages in temperature sensing.The Yb3+,Er3+and Tm3+tri-doped Ba3In2F12 phosphor was synthesized by a typical hydrothermal method.The crystal structure,luminescence spectrum and temperature sensing characteristics of the sample were studied by X-ray diffraction and fluorescence spectrometer.The emission peaks of the sample are located at 475,540,543,650,651 and 790 nm which correspond to the 1G4→3H6(Tm3+),2H11/2/4S3/4→4I15/2 and 4F9/2→4I15/2(Er3+)and 1G4→ 3F4 and 3H4→3H6(Tm3+)transitions under 980 nm excitation.Meanwhile,the temperature sensing performance in the range of 260-480 K was studied based on the fluorescence intensity ratio technique at thermal and non-thermal coupling levels.By introducing a multi-channel temperature measurement method,a high sensitivity temperature measure-ment mode was constructed in the wide temperature range of 260-480 K.The above results prove that the mate-rial is a kind of optical temperature sensor with good application prospect.
optical temperature sensingup-conversion luminescenceLIRsensitivityrare earths