A study on temperature sensing performance based on the luminescence of Eu3+ and Er3+ co-doped YNbO4. Issue 24 (8th June 2020) - Mao, Jiashan
Abstract : Eu 3+ and Er 3+ co-doped YNbO4 powder phosphors were synthesized by a traditional high-temperature solid-state reaction method. Abstract : Eu 3+ and Er 3+ co-doped YNbO4 powder phosphors were synthesized by a traditional high-temperature solid-state reaction method. A laser of 487.6 nm wavelength was selected to be the excitation source which can pump Eu 3+ ions from its thermally populated low-lying 7 F2 ground state to the excited state 5 D2 and lift the Er 3+ ions from their 4 I15/2 to 4 F7/2 states. Fluorescence intensity ratio (FIR) between the 5 D0 → 7 F J emissions of Eu 3+ and 4 S3/2 → 4 I15/2 emissions of Er 3+ ions is remarkably dependent on temperature because of the dramatic increase of Eu 3+ luminescence against a slight quenching of Er 3+ luminescence with the rise of temperature. This temperature sensitive FIR can be favorably employed for temperature sensing, owing to this novel scheme of 5 D2 excitation, instead of 5 D0, from 7 F2 and utilizing Er 3+ luminescence as a reference for FIR measurements. This sample is also prominent for its excellent signal-to-noise ratio and is a promising candidate for an optical temperature sensor.