Surface defect-related luminescence properties of SnO2 nanorods and nanoparticles

Kar, Arik ; Kundu, Simanta ; Patra, Amitava (2011) Surface defect-related luminescence properties of SnO2 nanorods and nanoparticles The Journal of Physical Chemistry C, 115 (1). pp. 118-124. ISSN 1932-7447

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp110313b?jour...

Related URL: http://dx.doi.org/10.1021/jp110313b

Abstract

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 (V0••) 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.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:104748
Deposited On:01 Dec 2017 11:11
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