Abstract
Optical temperature sensing has attracted significant attention owing to its unique characteristics of rapid response, non-contact detection, high resolution and high sensitivity. In this study, a series of Gd3BWO9: Yb3+, Ho3+ upconversion phosphors were synthesized by solid-state synthesis, and the optimal sample was Gd3BWO9: 0.32 Yb3+, 0.003Ho3+. The upconversion emission spectrum was measured under the excitation of 980 nm laser, and the emission peaks in the bands of 528–560 nm and 630–680 nm corresponded to the green emission (5F4/5S2→5I8) and red emission (5F5/→5I8) of Ho3+. The SR and SA of Gd3BWO9:0.32 Yb3+, 0.003Ho3+ in the range of 300 K–625 K were calculated. At 300 K, both the relative sensitivity SR and the absolute sensitivity SA reached their maximum values, which are SR(max) = 0.73 % K−1 and SA(max) = 0.0508 K-1, respectively. The Gd3BWO9: 0.32 Yb3+, 0.003Ho3+ phosphor has a very high absolute sensitivity, and hold great application potential in optical temperature sensing.
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