Design opto-thermo-mechano-multi-responsive luminescence from Sr4Al14O25: Eu2+, Nd3+, Tm3+ for optical information storage

The differences in the luminescent performance of phosphors determine their application in diverse occasions. However, the development of Eu2+ ion doped phosphors materials with high optical properties is not satisfactory due to the harsh synthesis conditions. Herein, a series of Sr4Al14O25: Eu2+, Nd3+, Tm3+ are constructed by high temperature solid reaction without applying reducing gas and protective gas. The charge mismatch caused by the unequal substitution promotes the spontaneous reduction of Eu3+ ions to Eu2+. Nd3+ and Tm3+ are co-doped into Sr4Al14O25: Eu2+ to regulate the trap structure, and photoluminescence, long persistent luminescence, photo-stimulated luminescence and mechanoluminescence of Eu2+ ions are simultaneously achieved in Sr4Al14O25: Eu2+, Nd3+, Tm3+. The relationship between trap and optical performance is explored in detail, and the temperature effect during mechanoluminescence is demonstrated for the first time. This research provides a new idea for the rapid synthesis of highly optical performance Eu2+-doped phosphors in air.