Microwave heating synthesis and luminescence of NaY(WO4)2:(Ho3+, Yb3+) phosphors
Microwave heating synthesis and luminescence of NaY(WO4)2:(Ho3+, Yb3+) phosphors
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DOI：
10.1007/s10854-014-2388-y
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Yang Yang-Yang;Hao Feng;Xiuguo Zhang
中科院分区：
文献类型：
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作者：
Yang Yang-Yang;Hao Feng;Xiuguo Zhang
采用微波加热法在EDTA的作用下合成了NaY（WO 4）2：（Ho 3+，Yb 3+）荧光粉。采用XRD、FT-IR、SEM和荧光分光光度计对样品进行了表征。XRD和FT-IR结果表明，样品为四方晶系。SEM结果表明，所得样品具有八面体形貌。“定向附着”和“奥斯特瓦尔德熟化”在八面体的形成中起着关键作用。NaY（WO 4）2：（Ho 3+，Yb 3+）荧光粉在980 nm激发下的紫外发射光谱显示出两个较强的带，分别对应于Ho 3+离子的5 F4 + 5S 2 → 5I 8和5 F5 → 5I 8跃迁。根据Yb ~（3+）和Ho ~（3+）的能级图，以及UC发光强度随功率变化的结果，推导了不同波段的可能激发路径。NaY（WO 4）2：（Ho 3+，Yb 3+）荧光粉的绿色和红色UC发射来源于双光子过程。此外，样品具有良好的热稳定性。
NaY(WO4)2:(Ho3+, Yb3+) phosphors were synthesized by microwave heating in an EDTA-mediated process. The samples were characterized by XRD, FT-IR, SEM, and fluorescence spectrophotometer. The XRD and FT-IR results show that the samples have the tetragonal phase. The SEM results show that obtained samples have octahedral morphology. ‘Oriented attachment’ and ‘Ostwald ripening’ play key roles in the formation of octahedrons. The UC emission spectra of NaY(WO4)2:(Ho3+, Yb3+) phosphors under 980 nm excitation show two intense bands corresponding to5F4+5S2→5I8and5F5→5I8transitions of Ho3+ions. Based on the energy level diagrams of Yb3+and Ho3+, as well as the results of power dependence of UC emission intensities, possible excitation path ways for different bands are deduced. The green and red UC emissions of NaY(WO4)2:(Ho3+, Yb3+) phosphors originate from the two-photon process. Also, the samples have good thermal stability.