二价与三价铕共掺杂的硫酸锶荧光特性

发布时间：2018-05-16 11:40

本文选题：SrSO + 铕掺杂　；参考：《光子学报》2017年10期

【摘要】：以三价铕离子为单一铕源,采用化学共沉淀法制备了二价铕与三价铕共掺杂的SrSO_4荧光粉体材料.通过X射线衍射仪、扫描电镜、光致发光谱仪对该荧光粉的晶体结构、形貌、光致发光特性进行分析.研究发现:所合成的SrSO_4粉体材料为二价铕与三价铕共掺杂的SrSO_4微晶,其大小在1~10μm之间.在325nm的紫外光激发下该微晶能发射很强的绛红色荧光,其光致光谱由一个位于379nm的宽发光带和位于575nm、591nm和612nm的三个窄发光带组成.基于局域密度近似的密度泛函理论,计算了SrSO_4的能带结构及其氧缺陷能级,然后以能带结构为基础讨论了二价铕与三价铕共掺杂SrSO_4的发光机理.峰位于379nm的宽发光带可归因于SrSO_4微晶中二价铕离子发光中心的4f~65d~1→4f~7的电子跃迁,而三个红色窄发光峰分别来自三价铕离子~5D_0→~7F_0,~5D_0→~7F_1,~5D_0→~7F_2的电子跃迁.实验表明二价铕与三价铕共掺杂的SrSO_4能作为高效的绛红色荧光粉.
[Abstract]:SrSO_4 phosphors doped with trivalent europium and divalent europium were prepared by chemical coprecipitation with trivalent europium ion as a single europium source. The crystal structure, morphology and photoluminescence characteristics of the phosphor were analyzed by X-ray diffractometer, scanning electron microscope and photoluminescence spectrometer. It is found that the synthesized SrSO_4 powder is a SrSO_4 microcrystal doped with divalent europium and trivalent europium, and its size is between 1 渭 m and 10 渭 m. The crystal can emit strong crimson fluorescence under UV excitation of 325nm. Its photoluminescence consists of a wide luminescence band located in 379nm and three narrow luminescent bands at 575 nm and 591 nm 612nm. Based on the density functional theory of local density approximation, the energy band structure and oxygen defect level of SrSO_4 are calculated. Based on the energy band structure, the luminescence mechanism of SrSO_4 doped with divalent europium and trivalent europium is discussed. The wide luminescence band located in 379nm can be attributed to the electronic transition of 4f~65d~1 4f~7 in the EU ~ (2 +) luminescence center in SrSO_4 microcrystals, while the three narrow red luminescence peaks are derived from the electronic transition of EU ~ (3 +) ion ~ (5) D ~ (+) ~ + _ (5) D _ (0) _ 0 ~ (5) D _ (0) ~ 5 ~ (D ~ (-1) / s ~ (-1) / s ~ + ~ 5D _ 1 ~ + _ The experimental results show that SrSO_4 doped with trivalent europium and divalent europium can be used as highly efficient crimson phosphors.
【作者单位】：常州大学数理学院;
【基金】：国家自然科学基金(Nos.11574036,11604028)资助~~
【分类号】：O482.31

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