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题名: Trap states and carrier dynamics of TiO2 studied by photoluminescence spectroscopy under weak excitation condition
作者: Wang, Xiuli1, 2;  Feng, Zhaochi1;  Shi, Jianying1;  Jia, Guoqing1, 2;  Shen, Shuai1, 2;  Zhou, Jun1, 2;  Li, Can1
刊名: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
发表日期: 2010
DOI: 10.1039/b925277k
卷: 12, 期:26, 页:7083-7090
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Chemistry ;  Physics
英文摘要: Anatase and rutile TiO2 were investigated with photoluminescence techniques under the weak excitation condition, where trap states play a vital role in carrier dynamics. The visible emission of anatase and near-infrared (NIR) emission of rutile both exhibit extremely long lifetimes up to milliseconds. The decay processes can be well described by the power-law decay which corresponds to the trapping-detrapping effect. These results indicate that the luminescence processes in both anatase and rutile TiO2 have a close relationship with trap states. The visible emission band was assigned to the donor-acceptor recombination. Oxygen vacancies and hydroxyl groups mainly serve as the donor and acceptor sites, respectively. The NIR luminescence is originated from the recombination of trapped electrons with free holes, while the trapped electrons were formed through two paths, direct trapping or trap-to-trap hopping. The trap states in anatase and rutile TiO2 may largely influence the photocatalysis process of TiO2 and determine the photocatalytic activity under stationary illumination.
关键词[WOS]: TRANSIENT ABSORPTION-SPECTROSCOPY ;  TEMPERATURE-DEPENDENT PHOTOLUMINESCENCE ;  DIFFUSE-REFLECTANCE SPECTROSCOPY ;  ELECTRON-HOLE RECOMBINATION ;  TIME-RESOLVED LUMINESCENCE ;  ANATASE TIO2 ;  SEMICONDUCTOR CLUSTERS ;  CHARGE SEPARATION ;  IR SPECTROSCOPY ;  IRRADIATED TIO2
语种: 英语
WOS记录号: WOS:000279098300023
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142230
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

Recommended Citation:
Wang, Xiuli,Feng, Zhaochi,Shi, Jianying,et al. Trap states and carrier dynamics of TiO2 studied by photoluminescence spectroscopy under weak excitation condition[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2010,12(26):7083-7090.
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