RED LIGHT-EMITTING AFTERGLOW PHOTOLUMINESCENCE PHOSPHOR AND AFTERGLOW LAMP USING THE PHOSPHOR

摘要

A red light-emitting afterglow photoluminescence phosphor comprising a rare earth oxide sulfide phosphor which is activated by europium and has a chemical composition in the range represented by the following formulae: Ln2O2S : Eux, My 0.00001 < x ? 0.5 0.00001 ? y ? 0.3 wherein Ln is at least one member selected from the group consisting of Y, La, Gd and Lu, and M is a coactivator which is at least one member selected from the group consisting of Mg, Ti, Nb, Ta and Ga.