The photo-luminescent phosphor emitting red light and the remaining residue of this fluorescent ligh

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A red light emitting afterglow photoluminescence phosphor is a rare earth oxysulfide phosphor activated by Europium, which chemical formula is follows : wherein Ln is at least one selected from the group consisting of Y, La, Gd and Lu; M is a coactivator which is at least one selected from the group consisting of Mg, Ti, Nb, Ta and Ga in the chemical formula.