Study on the temperature-sensitive properties of Ca_0.95Sr_0.05ScBO₄ phosphors co-doped with Bi³⁺ and Sm³

Ca_0.95Sr_0.05ScBO₄ phosphor co-doped with Bi³⁺ and Sm³⁺ was successfully synthesized using the conventional high-temperature solid-state method. The Phase Structure was analyzed by X-ray diffraction (XRD) and X-ray Photoelectron Spectroscopy (XPS), and luminescent properties were investigated through excitation and emission spectroscopy, fluorescence lifetime measurements, and thermal stability analysis. XRD analysis indicates that the Primary crystal structure of the phosphor is CaScBO₄. The doping of appropriate amounts of Sr²⁺, Bi³⁺and Sm³⁺ ions has not changed the Primary crystal structure of the phosphor. XPS analysis confirmed that Bi³⁺and Sm³⁺ ions successfully doping into the matrix material. Energy transfer from Bi³⁺ to Sm³⁺ occurs within the phosphor, energy transfer efficiency is 15.452%. When the temperature was raised from 298 K to 473 K, the relative intensity of the emission peak at 473 K decreased to 49.937% of that at room temperature, This indicates that the phosphor possesses relatively stable thermal stability. Studies on the temperature-sensitive properties of the samples reveal a marked difference in the luminescence thermal quenching trends between Sm³⁺ and Bi³⁺. The FIR between the two increases with rising temperature. Rendering it suitable for temperature characteristics. Within the temperature range of 298-473 K, both S_R and S_A exhibit a trend of first increasing and then decreasing with the rise of temperature. At 448 K, it achieves a maximum relative sensitivity of 0.233% K^-1. Upon calculation, its activation energy is determined to be 0.333 eV. These results demonstrate the superior temperature stability of this phosphor sample.