| 查看: 104 | 回复: 0 | |||
| 当前主题已经存档。 | |||
clfu2000木虫 (著名写手)
小木虫村村长
|
[交流]
Surface-state related luminescence in ZnO nanocrystals
|
||
|
J. Appl. Phys. 101, 073506 (2007) Johannes Fallert,* Robert Hauschild, Felix Stelzl, Alex Urban, Markus Wissinger, Huijuan Zhou, Claus Klingshirn, and Heinz Kalt Institut für Angewandte Physik, Universität Karlsruhe (TH), Wolfgang-Gaede-Strasse 1, 76131 Karlsruhe, Germany Received: 7 December 2006; accepted: 14 February 2007; published online: 4 April 2007 We investigate the optical properties of four different samples of ZnO nanocrystals, with a particle size average varying from 70 up to 380 nm. The photoluminescence (PL) of all samples shows at low temperature an emission band around 3.31 eV, which is several orders of magnitude stronger compared to the PL of bulk ZnO at this energy. This band shows a clear dependence on the surface to volume ratio of the nanocrystals and is therefore assigned to surface states. Temperature dependent measurements reveal that this band plays a major role up to room temperature for all examined ZnO powders. Additionally, intensity dependent measurements display that the origin of this emission band can be assigned to bound exciton complexes (BECs). Compared to the well known shallow BECs the measured lifetimes of these relatively strong bound excitons states are much longer   [search]Surface-state related luminescence in ZnO nanoc ...[/search] http://www.box.net/shared/yyo97i3dyq [ Last edited by luo.henry on 2008-4-29 at 09:53 ] |
回复此楼» 猜你喜欢
存款400万可以在学校里躺平吗
已经有33人回复
-
拟解决的关键科学问题还要不要写
已经有8人回复
-
最失望的一年
已经有14人回复
-
求助一下有机合成大神
已经有3人回复
-
求推荐英文EI期刊
已经有5人回复
-
请教限项目规定
已经有4人回复
-
26申博
已经有3人回复
-
基金委咋了？2026年的指南还没有出来？
已经有10人回复
-
基金申报
已经有6人回复
-
疑惑？
已经有5人回复
