We report a universal strategy consisting of I1/I2 and I2/I1 parts to enhance the SA for temperature sensing applications.

Ultraviolet-C light has significant application prospects in the fields of disinfection, air purification, etc. Herein, an effective UVC upconversion phosphor Y 2 SiO 5 :Pr 3+ was successfully prepared, as evidenced by the XRD results. The diffuse reflection spectra of Y 2 SiO 5 : Pr 3+ phosphors presented two distinct absorption bands corresponding to the electron transitions of 3 H 4 → 3 P 2 and 3 H 4 → 1 D 2 , and the E g was determined to be 4.22 eV for the Y 2 SiO 5 host, which is very close to the E g (4.172 eV) calculated by DFT. Under the excitation of 460 nm laser, two emission peaks centered at ~247 nm and ~ 258 nm were found in the range of 230-280 nm, which are attributed to the transitions of 4 f 5 d → 3 H 4 and 4 f 5 d → 3 H 5 of Pr 3+ ions. With the help of temperature-dependent emission spectra, the phosphor demonstrated impressive thermal stability up to 150 °C. These findings indicate that the Y 2 SiO 5 : Pr 3+ phosphor has the potential application in disinfection.

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Er3+-doped UC materials with high sensitivity show potential applications in industrial manufacture, science and technology and real life.

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