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

机译:Mn4 +活化的层状钙钛矿型锶氟化氧y的光致发光特性

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摘要

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 t2g 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.
机译:在这项研究中,我们发现即使在室温下,掺有Mn 4 + 的SrTiO3都没有发光,但是掺有Mn 4 + 的层状钙钛矿钛酸酯Sr2TiO4仍显示出光致发光。维庞大的钙钛矿结构。 Mn的t2g轨道相对于价带的相对位置是Sr2TiO4:Mn中出现Mn 4 + 发射的关键因素。该结果表明,与钙钛矿型材料相比,层状钙钛矿型材料更适合作为Mn 4 + 活化的荧光体的主体。我们对掺杂Mn 4 + 的层状钙钛矿化合物的光致发光的研究表明,用Mn 4 + 活化的氟氧化锶scan Sr2ScO3F表现出Mn 4 + -在300-600 nm激发下在697 nm处有一个峰值发射,其发射强度比Sr2TiO4:Mn强得多。在345 nm激发下,Sr2ScO3F:Mn的内部和外部量子产率分别为50.5和43.5%。

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