Structural analysis and optical temperature sensing performance of Eu3+-doped Ba3In(PO4)3

Eu3+-Doped Ba3In(PO4)(3) was synthesized through a high-temperature solid-phase method. According to the structure refinement based on X-ray diffraction and density functional theory, the crystal and energy band structures of Ba3In(1-x)(PO4)(3):xEu(3+) were studied and analyzed in detail. The effect of Eu3+ doping concentrations on emission was studied at an excitation wavelength of 393 nm. For the material Ba3In(1-x)(PO4)(3):xEu(3+) (x = 0.01-0.30), the optimal doping level is confirmed to be 0.18. Due to the thermal quenching differences of Eu3+ at the D-5(0) and D-5(1) energy levels, and based on the temperature-variable fluorescence intensity ratio between emission peaks, the optical temperature measurement performance of this material in the temperature range from 298.15 K to 623.15 K was characterized, and the maximum absolute and relative sensor sensitivities (S-a and S-r) were determined to be 0.1002 K(-1 )and 4.058%, respectively. With temperature as the only variable, the color of the phosphor changes from red to yellow light with rising temperature. Besides, S-a and S-r values of this phosphor are comparable to other sensing materials. The results indicate that Eu3+-doped Ba3In(PO4)(3)( )phosphors have great potential to be applied in optical temperature sensing.