High temperature sensitivity phosphor based on an old material: Red emitting H3BO3 flux assisted CaTiO3: Pr3+

High temperature sensitivity phosphor based on an old material red emitting CaTiO3: Pr3+ phosphor prepared via H3BO3 flux assisted solid-state reaction is reported. The typical sample possesses the orthorhombic perovskite phase and no impurity is found. The optical bandgap value is similar to 3.59 eV. There exists a single red emission with ideal color purity. The average long-afterglow decay time is 87.7s, the average trap depth is 0.76 eV. The maximum absolute sensitivity at 473 K is equal to similar to 0.0258 K-1 and the maximum relative sensitivity is estimated to be 7.69% K-1 at 298 K with the resolution of 0.26-0.65 K, indicating the suitability of the material for temperature sensitivity application. A possible mechanism for the quenching of P-3(j) emission at room temperature and the thermal quenching process of D-1(2) level through intervalence charge transfer state are proposed from the configurational coordinate diagram.