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A BaY2F8:Yb3+,Ho3+ phosphor was synthesized using a simple precipitation method. The temperature‐sensing properties of BaY2F8:Yb3+,Ho3+ phosphor were investigated using the fluorescence intensity ratio (FIR) of the thermally coupled energy levels (5F4 and 5S2) of Ho3+. Energy transitions 5F4→5I8 and 5S2→5I8 gave rise to emission peaks at 538 nm and 549 nm, respectively. The areas under these two emission...
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