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Effect of ZnS shell on optical properties of CdSe-ZnS core-shell quantum dots

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Title Effect of ZnS shell on optical properties of CdSe-ZnS core-shell quantum dots
 
Creator MATHEW, S
BHARDWAJ, BS
SARAN, AD
RADHAKRISHNAN, P
NAMPOORI, VPN
VALLABHAN, CPG
BELLARE, JR
 
Subject NANOCRYSTALS
Quantum dots
Deep trap states
Optical limiting
 
Description A modified microemulsion technique was used to synthesize CdSe-ZnS core-shell quantum dots (QDs) of similar to 5 nm diameter. Their nonlinear optical absorption was observed with nanosecond laser radiation of 532-nm wavelength. Linear optical studies show confinement effects. There is a new emission band around 745 nm under excitation of 532 nm which is an indication of the generation of deep trap states in CdSe QDs. As the ZnS shell thickness increases, there could be an increased electron-hole pair generation leading to large free-carrier concentration which in turn results in enhancement of nonlinear optical absorption. In addition, it was found that the optical limiting threshold gets decreased as the ZnS shell thickness increases. (C) 2014 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2016-01-15T04:49:00Z
2016-01-15T04:49:00Z
2015
 
Type Article
 
Identifier OPTICAL MATERIALS, 39,46-51
0925-3467
1873-1252
http://dx.doi.org/10.1016/j.optmat.2014.10.061
http://dspace.library.iitb.ac.in/jspui/handle/100/17798
 
Language en