Surface defects and their influence on structural and photoluminescence properties of CdWO4 : Eu3+ nanocrystals

	Surface defects and their influence on structural and photoluminescence properties of CdWO4 : Eu3+ nanocrystals
其他题名	论文其他题名
	Dai Q. L.; Song H. W.; Pan G. H.; Bai X.; Zhang H.; Qin R. F.; Hu L. Y.; Zhao H. F.; Lu S. Z.; Ren X. G.
	2007
发表期刊	Journal of Applied Physics
ISSN	0021-8979
卷号	102 期号:5
摘要	CdWO4:Eu3+ nanocrystals were prepared by the hydrothermal method at different pH values (pH=4, 7.5, and 10) and annealed at different temperatures. Their structural and photoluminescence properties were systemically studied. The studies on electron spin resonance and Fourier-transfer infrared absorption spectra demonstrated that at least two kinds of surface defects were involved, the surface dangling bonds of transition metals and the surface adsorption of the OH- and CO32- groups. The surface adsorption in the pH=10 sample increased considerably, which led the surface dangling bonds to decrease and even to disappear. Due to the existence of surface defect states, especially the surface dangling bonds, tungstates at two symmetry sites were formed, the normal site and the perturbed site locating at/near the surface. The former tungstates located at high energy side (similar to 290 nm) in the excitation bands and emitted blue-green photons, while the latter located at low energy (similar to 340 nm) and emitted red photons. They can both effectively transfer the energies to Eu3+ ions, generating red D-5(0)-F-7(J) transitions. As the nanocrystalline powders were annealed, colorations appeared and evolved with temperature, while the surface dangling bonds and surface adsorption gradually disappeared. The defect states had great and complicated influence on luminescence efficiency, luminescent stability, and temperature-stability of tunstates and Eu3+ ions. (c) 2007 American Institute of Physics.
收录类别	SCI ; EI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/26631
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Dai Q. L.,Song H. W.,Pan G. H.,et al. Surface defects and their influence on structural and photoluminescence properties of CdWO4 : Eu3+ nanocrystals[J]. Journal of Applied Physics,2007,102(5).
APA	Dai Q. L..,Song H. W..,Pan G. H..,Bai X..,Zhang H..,...&Ren X. G..(2007).Surface defects and their influence on structural and photoluminescence properties of CdWO4 : Eu3+ nanocrystals.Journal of Applied Physics,102(5).
MLA	Dai Q. L.,et al."Surface defects and their influence on structural and photoluminescence properties of CdWO4 : Eu3+ nanocrystals".Journal of Applied Physics 102.5(2007).

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