Long phosphorescent Ca2SnO4 with minuscule rare earth dopant concentration

Abstract

Rare-earth doped Ca₂SnO₄ phosphors were synthesized using a conventional solid state reaction method. The red phosphorescence of Eu³⁺ was observed in this system with persistence time. In the as-prepared samples, the doped rare earth ions occupied both Ca and Sn sites in the host lattice. The longest phosphorescent persistence property can be achieved for the Ca₂SnO₄ phosphors with a 0.1% Eu dopant. Depending on the doped rare earth ions, afterglow emissions of various colors were observed.