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水热法对Eu3＋掺杂CaMoO4微纳米荧光体的制备及其发光性能

ISSN号：1002-1124
期刊名称：《化学工程师》
时间：0
分类：TQ422[化学工程]
作者机构：[1]哈尔滨师范大学化学与化工学院,黑龙江哈尔滨150025
相关基金：基金项目：国家自然科学基金资助项目（20371014;20671026）

关键词： CaMoO4∶Eu3+, 微纳米荧光体, 水热法, 发光性能, CaMoO4：Eu3＋, micro/nanophosphors, hydrothermal, luminescence

中文摘要：

采用水热法成功的制得了不同形貌的CaMoO4：Eu3＋微纳米荧光体。实验结果表明，溶液的pH值在控制产物形貌上起了决定性的作用。用X射线粉末衍射（XRD）、场发射扫描电镜（FE—SEM）和荧光光谱（PL）等分析手段研究了荧光体的结构和光致发光性能。结果表明，CaMoO4：Eu3＋荧光体的激发光谱由两部分组成：1个宽的激发带（240～360nm）和属于Eu3＋的f—f跃迁的锐线谱（395nm、465nm），它的发射光谱只出现常见的2个发射峰：592nm（5D0→F1）、615nm（5D0→7F2），中5D0→7F2跃迁发射峰强度明显高于5D0→7F1跃迁发射峰强度，这表明Eu3＋在CaMoO4基质中处于无反演中心或偏离反演中心的格位上。本文还对造成发射峰强度变化的原因进行了分析，认为影响发射峰强度的原因有两个：表面积和对称性，材料的表面积越大，发光的猝灭越严重，荧光发射越弱；材料的结构对称性越差，跃迁戒律打破地越彻底，荧光发射越强。

英文摘要：

Eu3 ＋doped CaMoO4 micro/nanophosphors with various shapes have been synthesized by the hydrothermal method. Results showed that the pH value of the precursor solution played a key role in the formation of products with different morphologies. CaMoOn：Eu3＋ nanorods, microcubes, microoctahedrons were obtained and characterized by the X-ray powder ldiffraction （XRD） and field emission scanning electron microscopy （FE-SEM） and photoluminescence spectrophotometer （PL）. The excitation spectra showed a broad intense band （240nm- 360nm） and a number of small peaks centered at wavelengths extending from 360 nm to 500 nm corresponding to the inner 4f-shell excitations of Eu3＋（395nm,465nm）. The emission spectras showed the two common emission peaks： 592nm （5D0→7F1） and 615nm （5D0→7F2）. Obviously, the intensity of 5D0→7F2 is stronger than that of 5D0→7F1, which indicate that the Eu3＋ ion locates in a noncentrosymmetric position, or occupies the sites derived from an inversion center in this compound. The reasons of different morphologies with different intensity were also investigated. It is generally assumed that change of the intensity of CaMoO4：Eu3＋ is mainly attributed to the surface area and environment effects of materials, as the surface area enlarge, the intensity decreased due to the higher quenching; the probability of the forbidden transition increased as the symmetry of micro-structure decreased.

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