AUTHOR=Kato Hideki , Takeda Yohei , Kobayashi Makoto , Kobayashi Hisayoshi , Kakihana Masato 

TITLE=Photoluminescence Properties of Layered Perovskite-Type Strontium Scandium Oxyfluoride Activated With Mn4+

JOURNAL=Frontiers in Chemistry

VOLUME=6

YEAR=2018

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2018.00467

DOI=10.3389/fchem.2018.00467

ISSN=2296-2646

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