Up-conversion luminescence properties of LaF₃–LaOF:Yb³⁺/Tm³⁺ synthesized using solid-phase reaction method

Abstract

In this study, LaF₃–LaOF:Yb³⁺/Tm³⁺ upconversion phosphors were synthesized using a solid-phase reaction method. In addition, their crystal structures and optical properties were analyzed. The crystal structure was analyzed using an X-ray diffractometer, revealing compositions of LaF₃ and LaOF in each sample. Photoluminescence characteristics were analyzed, and peaks were observed at approximately 480 nm (¹G₄→³H₆) and 800 nm (³H₄→³H₆). Analysis of the pump-power dependence of the photoluminescence intensity revealed that the slope of the peak near 480 nm (¹G₄→³H₆) was less than two, indicating the influence of thermal quenching. Finally, the temperature characteristics were analyzed, and the absolute and relative sensitivities were 0.0085 K⁻¹ and 0.69 % K⁻¹, respectively.