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

Hideki Kato; Yohei Takeda; Makoto Kobayashi; Hisayoshi Kobayashi; Masato Kakihana

doi:10.3389/fchem.2018.00467

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

Front Chem. 2018 Oct 4:6:467. doi: 10.3389/fchem.2018.00467. eCollection 2018.

Authors

Hideki Kato¹, Yohei Takeda¹, Makoto Kobayashi¹, Hisayoshi Kobayashi², Masato Kakihana¹

Affiliations

¹ Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan.
² Department of Chemistry and Materials Technology, Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto, Japan.

Abstract

In this research, we have found that layered perovskite titanate Sr₂TiO₄ doped with Mn⁴⁺ exhibits photoluminescence even at room temperature despite no luminescence from Mn⁴⁺-doped SrTiO₃ 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 Mn⁴⁺-emission in Sr₂TiO₄:Mn. This result suggested usefulness of layered perovskite-type materials as hosts for Mn⁴⁺-activated phosphors than the bulky perovskite-type materials. Our investigation into photoluminescence of Mn⁴⁺-doped layered perovskite compounds has revealed that strontium scandium oxyfluoride Sr₂ScO₃F activated with Mn⁴⁺ exhibits Mn⁴⁺-emission with a peak at 697 nm under excitation at 300-600 nm and its emission intensity is much stronger than that of Sr₂TiO₄:Mn. The internal and external quantum yields of Sr₂ScO₃F:Mn were determined to be 50.5 and 43.5% under excitation at 345 nm, respectively.

Keywords: layered perovskite; photoluminescence; red emission; scandium oxyfluoride; tetravalent manganese.