Surface Defect-Related Luminescence Properties of SnO2 Nanorods and Nanoparticles

被引：334

作者：

Kar, Arik ^{[1
]}

Kundu, Simanta ^{[1
]}

Patra, Amitava ^{[1
]}

机构：

[1] Indian Assoc Cultivat Sci, Dept Mat Sci, Kolkata 700032, India

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2011年 / 115卷 / 01期

关键词：

TIN OXIDE; OPTICAL-PROPERTIES; SOLUTION-PHASE; PHOTOLUMINESCENCE PROPERTIES; ELECTRONIC-STRUCTURE; GROWTH; NANOCRYSTALS; NANOWIRES; NANOBELTS; MECHANISM;

D O I：

10.1021/jp110313b

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We demonstrate the surface defect-related luminescence properties of SnO2 nanorods and nanoparticles using steady-state and time-resolved spectroscopy. Defect-related bands are identified by Raman and EPR spectroscopy. On the basis of the experimental results, we propose a schematic model for different relaxation processes in SnO2 nanocrystals upon photoexcitation. Analysis suggests that the visible emission of SnO2 nanocrystals is due to a transition of an electron from a level close to the conduction band edge to a deeply trapped hole in the bulk (Vo) of the SnO2 nanocrystals. Analysis suggests that the surface-related defects are more prominent in smaller nanocrystals than in nanorods. It is found that the PL emission and decay time strongly depend on the shape of the nanocrystals. This proposed model is further confirmed by time-resolved spectroscopy.

引用

页码：118 / 124

页数：7

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