Crystal structure and luminescence properties of a single-component white-light-emitting phosphor Ca8ZnLa(PO4)(7):Eu2+,Mn2+
Crystal structure and luminescence properties of a single-component white-light-emitting phosphor Ca8ZnLa(PO4)(7):Eu2+,Mn2+
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单组分白光荧光粉Ca8ZnLa(PO4)(7):Eu2 ,Mn2的晶体结构及发光性能
DOI：
10.1111/jace.14868
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发表时间：
2017
影响因子：
3.9
通讯作者：
Liu YG
中科院分区：
文献类型：
--
作者：
Mi Ruiyu;Liu Yan-gai;Mei Lefu;Chen Jian;Huang Zhaohui;Fang Minghao;Zhao Chenglong;Liu YG
在还原气氛下，采用固相反应法制备了一系列新型的绿色荧光粉Ca 8 ZnLa（PO 4）7：Eu 2+和颜色可调的Ca 8 ZnLa（PO 4）7：Eu 2+，Mn 2+。通过高分辨透射电子显微镜、选区电子衍射、X射线光电子能谱和X射线粉末衍射Rietveld精修对其晶体结构和相组成进行了鉴定，发现其为三方晶系，属于R-3c（161）空间群。研究了Eu 2+单掺和Eu 2 +/Mn 2+共掺Ca 8 ZnLa（PO 4）7荧光粉的发光特性。Ca_8ZnLa（PO_4）_7：Eu ~（2+）在200 ~ 450 nm的宽范围内具有明显的绿色发光。在365 nm激发下，通过改变Eu 2 +/Mn 2+的比例，可以获得从绿色（0.221，0.468）到洋红（0.391，0.276）的精细调谐发射，特别是暖白色光（0.392，0.352），通过Eu 2+和Mn 2+之间的能量转移过程可以获得CCT 3500 K。该系统中的ET机制通过偶极-偶极相互作用进行管理，基于衰变寿命数据，最大能量转移效率为82.8%。这些结果表明，所制备的磷光体可以作为UV泵浦白光LED的有前途的候选者。
A series of novel green emission Whitlockite‐type Ca8ZnLa(PO4)7:Eu2+and color tunable Ca8ZnLa(PO4)7:Eu2+,Mn2+phosphors were prepared by the solid‐state reaction method in a reducing atmosphere. Its crystal structure and phase composition were identified by high‐resolution transmission electron microscopy, selected area electronic diffraction, X‐ray photoelectron spectroscopy, and X‐ray powder diffraction Rietveld refinement, and it was found to be trigonal, belonging toR‐3c(161) space group. The luminescence properties of Eu2+singly doped and Eu2+/Mn2+codoped Ca8ZnLa(PO4)7phosphors were revealed in detail. Ca8ZnLa(PO4)7:Eu2+is excitable over a broad range from 200 to 450 nm with a prominent green emitting. With varied Eu2+/Mn2+ratios, fine‐tune emission under 365 nm excitation can be achieved from green (0.221, 0.468) to magenta (0.391, 0.276), especially the warm white light (0.392, 0.352), and CCT 3500 K can be obtained by the process of energy transfer between Eu2+and Mn2+. The ET mechanism in this system is managed via the dipole‐dipole interaction with the maximum energy‐transfer efficiency 82.8% based on the decay lifetime data. These results suggest that as‐prepared phosphors can serve as promising candidates of UV‐pumpedw‐LEDs.