Nano Archive

Optically bifunctional heterostructured nanocrystals

Nag, Angshuman and Kumar, Akshay and Kiran, P. Prem and Chakraborty, S and Kumar, G. Ravindra and Sarma, D. D. (2008) Optically bifunctional heterostructured nanocrystals. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (22). pp. 8229-8233.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp800063f

Abstract

We show that an attempt to synthesize nanocrystal alloys of Cd1-xZnxSySe1-y in a single-step reaction leads naturally to a heterostructured nanocrystal system with CdSe-rich core and CdS-ZnS hybrid shell because of differences in chemical reactivities of the different constituents. These nanocrystals exhibit very high (similar to 65%) photoluminescence (PL) efficiency. The band-edge excitonic energy and the corresponding band-edge emission can be tuned over a range of the visible spectrum by changing the composition. These samples show very strong two-photon absorption cross section (sigma(2) = 1.923 x 10(-47) cm(4 center dot)s/photon or 1923 GM), establishing a very rare example of an optically bifunctional material with tunability and a very high quantum efficiency for linear optical properties, namely, PL, and strong nonlinear properties, namely, two-photon absorption.

Item Type:Article
Subjects:Material Science > Nanofabrication processes and tools
Material Science > Nanostructured materials
Physical Science > Photonics
ID Code:1465
Deposited By:Farnush Anwar
Deposited On:12 Dec 2008 14:15
Last Modified:19 Feb 2009 09:01

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