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Title: Synthesis of PbS/CdS core-shell QDs and their nonlinear optical properties
Authors: Neo, M.S.
Venkatram, N. 
Li, G.S.
Chin, W.S. 
Ji, W. 
Issue Date: 28-Oct-2010
Citation: Neo, M.S., Venkatram, N., Li, G.S., Chin, W.S., Ji, W. (2010-10-28). Synthesis of PbS/CdS core-shell QDs and their nonlinear optical properties. Journal of Physical Chemistry C 114 (42) : 18037-18044. ScholarBank@NUS Repository.
Abstract: We synthesized different sizes of PbS/CdS core-shell quantum dots (CSQDs) by using a cation-exchange method and studied the changes in their absorption and luminescence. Blue shifts in the absorption and photoluminescence (PL) peaks were observed with varying PL quantum yields. The PbS/CdS CSQDs dispersed in hexane or embedded in polystyrene films showed higher free-carrier absorption (FCA) as compared to pure PbS QDs. Saturable absorption (SA) was found to be significant in the smallest nanoparticles in both hexane and polymer films. A size-dependent FCA coefficient was observable, and smaller PbS/CdS nanoparticles were found to exhibit greater FCA. Free surface ligands were found to contribute to an enhancement in the nonlinear scattering above a critical irradiance threshold. We found that the FCA cross-section and the nonlinear refractive index are independent of the thickness of PbS/CdS-embedded polymer within experimental error. © 2010 American Chemical Society.
Source Title: Journal of Physical Chemistry C
ISSN: 19327447
DOI: 10.1021/jp104311j
Appears in Collections:Staff Publications

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