Luminescence properties of double-perovskite Sr2Ca1−2xEuxNaxMoO6 red-emitting phosphors prepared by the citric acid-assisted sol–gel method
Luminescence properties of double-perovskite Sr2Ca1−2xEuxNaxMoO6 red-emitting phosphors prepared by the citric acid-assisted sol–gel method
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DOI：
10.1007/s10853-009-4123-2
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发表时间：
2010-03
影响因子：
4.5
通讯作者：
Z. Xia;Jianfeng Sun;H. Du;Daimei Chen;Jia-yue Sun
中科院分区：
文献类型：
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作者：
Z. Xia;Jianfeng Sun;H. Du;Daimei Chen;Jia-yue Sun
采用柠檬酸辅助溶胶凝胶法制备了双钙钛矿Sr2Ca1−2xEuxNaxMoO6红光荧光粉，并研究了其发光性能随烧结温度和Eu3+掺杂浓度的变化。选择B位取代的Sr2Ca0.8Eu0.1Na0.1MoO6荧光粉，其中Na+离子作为电荷补偿剂，研究了不同烧结温度下的热行为、相结构、微观结构和光致发光性能。对 Sr2Ca1−2xEuxNaxMoO6(x= 0.02, 0.05, 0.10, 0.15, 0.2) 的光致发光研究表明，在不同的 Eu3+ 激发（396 和 412 nm）下，观察到了 594 nm 左右的主要红色发射线，这是由于 5D0–7F1 的 Eu3+ 磁偶极跃迁引起的。此外，Sr2Ca1−2xEuxNaxMoO6 磷光体的 Eu3+ 掺杂剂含量依赖性发射光谱研究表明，当 Eu3+ 浓度 x= 0.05 时，5D0–7F1 跃迁在 594 nm 处的发射强度与 5D0–7F2 跃迁在 615 nm 处的发射强度之间存在最小差异。随着Eu3+浓度的增加，两个跃迁之间的发射强度变化几乎保持不变，并且Sr2Ca0.8Eu0.1Na0.1MoO6磷光体在该系列中具有最强的红光发射。
Double-perovskite Sr2Ca1−2xEuxNaxMoO6red-emitting phosphors were prepared by the citric acid-assisted sol–gel method, and their luminescence properties were investigated as a function of sintering temperature and Eu3+-doping concentration. B-site substituted Sr2Ca0.8Eu0.1Na0.1MoO6phosphor, in which Na+ions act as charge compensators, was selected to study the thermal behavior, phase structure, microstructure, and photoluminescence property under different sintering temperatures. The photoluminescence studies on Sr2Ca1−2xEuxNaxMoO6(x= 0.02, 0.05, 0.10, 0.15, 0.2) show that a dominant red emission line at around 594 nm, which is due to the Eu3+magnetic dipole transition of5D0–7F1, is observed under different Eu3+excitations (396 and 412 nm). Further, Eu3+dopant content dependent emission spectra investigations of Sr2Ca1−2xEuxNaxMoO6phosphors indicates that, when the Eu3+concentrationsx= 0.05, there are minimum differences between the emission intensity of5D0–7F1transition at 594 nm and that of5D0–7F2transition at 615 nm. With increasing Eu3+concentration, the variation of the emission intensities between the two transitions keep nearly invariable and Sr2Ca0.8Eu0.1Na0.1MoO6phosphor has the strongest red emission in this series.