The luminescent property and abnormal thermal quenching behavior of Pr³⁺ ions in novel red phosphor Ca₁₉Mg₂(PO₄)₁₄:Pr³⁺

A novel Pr³⁺ ions doped red phosphor Ca₁₉Mg₂(PO₄)₁₄:Pr³⁺was first synthesized and the phase purity as well as the characteristic photoluminescence property was investigated through X-ray diffraction, diffuse-reflectance and photoluminescence spectra measurement. The analysis revealed that Ca₁₉Mg₂(PO₄)₁₄:Pr³⁺ had strong absorption from 450 to 470 nm and could exhibit red emission peaking around 610 nm under 450 nm excitation. The emission quenching behavior of ¹D₂–³H₄ transitions via increasing the Pr³⁺ contents was investigated and the mechanism was discussed in detail. The temperature dependent emission spectra of Ca₁₉Mg₂(PO₄)₁₄:xPr³⁺ with different doping contents (x=0.002 and x=0.02) were studied and the abnormal thermal quenching property was investigated.