Blue to UV upconversion properties of Pr3+ doped ACaF3 (A = K, Rb, Cs) phosphors
Nadiia Rebrova; Alexander Grippa; Patrycja Zdeb; Przemysław J. Dereń
Abstract:
Materials capable of converting visible light into the ultraviolet C (UVC) region are promising candidates for antimicrobial technology and photocatalytic applications. In this work, the effective UVC upconversion phosphors ACaF3:Pr3+ (A = K, Rb, Cs) were synthesized using solid state reactions. Upconverted emissions in the range from 230 to 315 nm were obtained with 444 nm laser excitation. The dependence of upconverted luminescence on pump power, the concentration of Pr3+ ions, and the decay profiles of upconverted luminescence provide insights into the primary mechanisms responsible for upconversion. Among the obtained fluoroperovskites, the rubidium composition showed the most intense luminescence. Additionally, ACaF3:1 %Pr3+ exhibits a manifold increase in upconversion emission compared to the previously studied reference material LiYF4:1 %Pr3+, indicating the potential use of fluoroperovskites for surface decontamination.
