Changchun Institute of Optics,Fine Mechanics and Physics,CAS
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). |
条目包含的文件 | ||||||
文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
Dai-2007-Surface def(1037KB) | 开放获取 | -- | 浏览 请求全文 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论