Long persistent properties of CaGa 2 O 4 :Bi 3+ at different ambient temperature

Abstract A yellow long persistent luminescence (LPL) phosphor of CaGa 2 O 4 :Bi 3+ (CGO:Bi) is developed, of which the LPL can be visually recognized (0.32 mcd m −2 ) over 36 hours after the removal of the excitation source. Furthermore, an excellent LPL performance above the room temperature and unusual thermal quenching behavior are observed. The thermoluminescence (TL) curves indicate that the continuity of the traps structure with different depths is a key factor in ensuring that carriers could be released from deep traps above room temperature successively. The work verifies unambiguously that the continuous defect‐state structure is beneficial to the LPL temperature resistant abilities, which would provide a reasonable approach to design new LPL phosphors in extreme environments.