Kato Hideki, Takeda Yohei, Kobayashi Makoto, Kobayashi Hisayoshi, Kakihana Masato
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan.
Department of Chemistry and Materials Technology, Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto, Japan.
Front Chem. 2018 Oct 4;6:467. doi: 10.3389/fchem.2018.00467. eCollection 2018.
In this research, we have found that layered perovskite titanate SrTiO doped with Mn exhibits photoluminescence even at room temperature despite no luminescence from Mn-doped SrTiO with a three-dimensional bulky perovskite structure. The relative position of t orbital of Mn to the valence band is a key factor for appearance of Mn-emission in SrTiO:Mn. This result suggested usefulness of layered perovskite-type materials as hosts for Mn-activated phosphors than the bulky perovskite-type materials. Our investigation into photoluminescence of Mn-doped layered perovskite compounds has revealed that strontium scandium oxyfluoride SrScOF activated with Mn exhibits Mn-emission with a peak at 697 nm under excitation at 300-600 nm and its emission intensity is much stronger than that of SrTiO:Mn. The internal and external quantum yields of SrScOF:Mn were determined to be 50.5 and 43.5% under excitation at 345 nm, respectively.
在本研究中，我们发现，尽管具有三维块状钙钛矿结构的掺锰SrTiO不发光，但层状钙钛矿钛酸盐SrTiO掺杂锰后即使在室温下也能表现出光致发光。锰的t轨道相对于价带的相对位置是SrTiO:Mn中锰发射出现的关键因素。该结果表明，层状钙钛矿型材料作为锰激活磷光体的基质比块状钙钛矿型材料更有用。我们对掺锰层状钙钛矿化合物光致发光的研究表明，用锰激活的锶钪氟氧化物SrScOF在300 - 600 nm激发下表现出峰值在697 nm的锰发射，其发射强度比SrTiO:Mn强得多。在345 nm激发下，SrScOF:Mn的内量子产率和外量子产率分别测定为50.5%和43.5%。
