Thermal activation induced charge transfer state absorption redshift realizes strong anti-thermal quenching in Pr-activated phosphor

In our work, a totally anomalous thermal quenching phenomenon of red-shifted and enhanced charge transfer state (CTS) absorption is found for the first time in LiTaO 3 : x Pr 3+ phosphors. The crystal structure, luminescent properties and the mechanism of abnormal thermal quenching were investigated in detail. A totally abnormal thermal quenching of red-shifted and enhanced charge transfer state absorption is found in LiTaO 3 :Pr 3+ phosphors, which makes the phosphors show distinct thermal quenching properties at specific excitation wavelengths.