Inducing NIR long persistent phosphorescence in Cr-doped perovskite titanate via redox

Abstract We report a simple approach to activate the near-infrared (NIR) long persistent phosphorescence via redox reaction. NIR long persistent phosphorescence is observed in a Cr-doped non-gallate phosphor, i.e. CaTiO 3 : Cr with perovskite structure through heat treatment in reducing atmosphere, while no such phenomenon is observed in the sample with same composition and heat treated in air. The mechanism for activation of Cr-related long persistent phosphorescence is discussed. The designed phosphors successfully break the monopoly of the ordinary Cr 3+ -activated gallate phosphors with the spinel structure and provides a new route for design of long persistent phosphors.