Photoluminescence Properties of Layered Perovskite-Type Strontium Scandium Oxyfluoride Activated With Mn(4+)

In this research, we have found that layered perovskite titanate Sr(2)TiO(4) doped with Mn(4+) exhibits photoluminescence even at room temperature despite no luminescence from Mn(4+)-doped SrTiO(3) with a three-dimensional bulky perovskite structure. The relative position of t(2g) orbital of Mn to the valence band is a key factor for appearance of Mn(4+)-emission in Sr(2)TiO(4):Mn. This result suggested usefulness of layered perovskite-type materials as hosts for Mn(4+)-activated phosphors than the bulky perovskite-type materials. Our investigation into photoluminescence of Mn(4+)-doped layered perovskite compounds has revealed that strontium scandium oxyfluoride Sr(2)ScO(3)F activated with Mn(4+) exhibits Mn(4+)-emission with a peak at 697 nm under excitation at 300–600 nm and its emission intensity is much stronger than that of Sr(2)TiO(4):Mn. The internal and external quantum yields of Sr(2)ScO(3)F:Mn were determined to be 50.5 and 43.5% under excitation at 345 nm, respectively.