Abstract
Exploring an up-conversion (UC) phosphor for the fluorescence intensity ratio (FIR) technique has been a great challenge in the field of optical temperature sensors. In this paper, a two-step synthetic route [Y(OH)CO 3 →Y(OH) 1.63 F 1.37 →Y 6 O 5 F 8 ] was designed to successfully synthesize Y 6 O 5 F 8 :Yb 3+ /Er 3+ UC phosphors for optical temperature sensing. The phase and morphology of the samples at various stages of the synthetic route were investigated. Under 980 nm excitation, two green emission bands centered at 522 nm and 547 nm and a red emission band centered at 670 nm were observed. Y 6 O 5 F 8 :10%Yb 3+ /1%Er 3+ exhibited the strongest UC emission under 980 nm excitation and was selected for further characterizations. The absorption and emission processes (a two-photon process) of photons in Y 6 O 5 F 8 :10%Yb 3+ /1%Er 3+ were elucidated based on the UC luminescence mechanism. Among them, the ET occupies a key position, which was also confirmed by the decay curves. In addition, the optical temperature sensing behavior of Y 6 O 5 F 8 :10%Yb 3+ /1%Er 3+ was explored using the FIR technique. The maximum absolute and relative sensitivities were determined to be 0.0074 K -1 (518 K) and 1.39% K −1 (293 K), respectively. The results show that Y 6 O 5 F 8 :10%Yb 3+ /1%Er 3+ phosphor has promising application potentials in optical temperature sensors with excellent sensitivity. A two-step synthetic route [Y(OH)CO 3 →Y(OH) 1.63 F 1.37 →Y 6 O 5 F 8 ] was designed to successfully synthesize Y 6 O 5 F 8 :Yb 3+ /Er 3+ UC phosphors. The optical temperature sensing performance of Y 6 O 5 F 8 :0.1Yb 3+ /0.01Er 3+ was evaluated based on the FIR technique, and its maximum absolute and relative sensitivities were determined to be 0.0074 K -1 (518 K) and 1.39% K −1 (293 K), respectively. • A two-step synthetic route was designed to successfully synthesize Y 6 O 5 F 8 . • The possible UC pathways of photons in Y 6 O 5 F 8 :0.1Yb 3+ /0.01Er 3+ were proposed. • High sensitivity for optical temperature sensing was found in this host material.
Published Version
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