Host Lattice-Excitation-Enhanced Photoluminescence in Eu3+-Doped LaInO3 Epitaxial Films
Host Lattice-Excitation-Enhanced Photoluminescence in Eu3+-Doped LaInO3 Epitaxial Films
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Eu3 掺杂 LaInO3 外延薄膜中的主晶格激发增强光致发光
DOI：
10.1021/acs.cgd.0c01531
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发表时间：
2021
影响因子：
3.8
通讯作者：
Takashima Hiroshi
中科院分区：
文献类型：
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作者：
Oshime Norihiro;Ueda Kazushige;Takashima Hiroshi
氧化物-磷光体外延膜具有与衬底的大的晶格失配，可以显著地改变块体或粉末的光致发光（PL）性质。我们研究了在STO单晶（001）上外延生长的磷光体Eu0.10La0.90InO3（ELIO;与SrTiO 3（STO）的晶格失配约为5-7%）的PL特性。X射线衍射分析表明，在STO（001）上的ELIO外延膜形成了一个尺寸为几十纳米的90°畴，晶格膨胀率为4.62%。在紫外光激发下，从ELIO外延膜观察到强烈的橙红色发光，类似于ELIO粉末的情况。PL激发光谱表明，ELIO外延膜的红光发射是由基质晶格（HL）激发引起的，而不是电荷转移激发引起的。在ELIO外延膜中的有效HL激发将有利于具有ELIO发射层的薄膜型EL器件的制造。
Oxide-phosphor epitaxial films having a large lattice mismatch with the substrate may significantly alter the photoluminescence (PL) properties of the bulk or powder. We investigated the PL characteristics of phosphor Eu0.10La0.90InO3(ELIO; lattice mismatch of approximately 5–7% with SrTiO3(STO)) epitaxially grown on an STO single crystal (001). X-ray diffraction patterns indicated that the ELIO epitaxial film on STO (001) formed a 90° domain with a size of tens of nanometers and underwent 4.62% lattice expansion. Intense orange-red luminescence was observed from the ELIO epitaxial film under ultraviolet excitation, similar to the case of the ELIO powder. The PL excitation spectra indicated that host lattice (HL) excitation, rather than charge-transfer excitation, led to the red luminescence in the ELIO epitaxial film, in contrast to that in the ELIO powder. The efficient HL excitation in the ELIO epitaxial film will be advantageous for the fabrication of thin-film-type EL devices with an ELIO emitting layer.