Structural investigation of Eu2+ emissions from alkaline earth zirconium phosphate
Structural investigation of Eu2+ emissions from alkaline earth zirconium phosphate
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DOI：
10.1016/j.jssc.2008.12.015
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发表时间：
2009-04
影响因子：
3.3
通讯作者：
M. Hirayama;N. Sonoyama;A. Yamada;R. Kanno
中科院分区：
文献类型：
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作者：
M. Hirayama;N. Sonoyama;A. Yamada;R. Kanno
采用共沉淀法合成了具有NASICON结构的Eu 2+掺杂A0. 5 Zr 2（PO 4）3（A=Ca，Sr，Ba）荧光粉。通过光致发光光谱和粉末X射线Rietveld分析研究了它们的光致发光和结构特性，确定了Eu 2+离子在主体结构3a和3b中的两个位点。碱土金属离子由Ca变为Ba后，Eu-O键长增加，Eu 2+发射带由蓝绿色变为蓝色。峰波长位置与Eu-O键长之间存在相关性。讨论了晶体场强度和云拉效应对发光性能的影响，并给出了Eu ~（2+）掺杂NASICON荧光粉的发光示意图。
Eu2+doped A0.5Zr2(PO4)3(A=Ca, Sr, Ba) phosphors with the NASICON structure were synthesized by a co-precipitation method. Their photoluminescent and structural properties were investigated by photoluminescent spectroscopy and powder X-ray Rietveld analysis, which determined two sites for Eu2+ions in the host structure, 3a and 3b. The Eu–O bond lengths were increased by changing alkaline earth ions from Ca to Ba, causing Eu2+emission bands to shift from blue-green to blue. A correlation was observed between the peak wavelength positions and the Eu–O bond length. The photoluminescent properties are discussed in terms of crystal field strength and nephelauxetic effect, and a schematic diagram of Eu2+emissions is proposed for the Eu2+doped NASICON phosphor.