An effective oxidation approach for luminescence enhancement in CdS quantum dots by H2O2Report as inadecuate




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Nanoscale Research Letters

, 7:672

First Online: 12 December 2012Received: 23 November 2012Accepted: 28 November 2012

Abstract

The effects of surface passivation on the photoluminescence PL properties of CdS nanoparticles oxidized by straightforward H2O2 injection were examined. Compared to pristine cadmium sulfide nanocrystals quantum efficiency ≅ 0.1%, the surface-passivated CdS nanoparticles showed significantly enhanced luminescence properties quantum efficiency ≅ 20%. The surface passivation by H2O2 injection was characterized using X-ray photoelectron spectroscopy, X-ray diffraction, and time-resolved PL. The photoluminescence enhancement is due to the two-order increase in the radiative recombination rate by the sulfate passivation layer.

KeywordsPhotoluminescence Surface passivation Quantum efficiency Electronic supplementary materialThe online version of this article doi:10.1186-1556-276X-7-672 contains supplementary material, which is available to authorized users.

Woojin Lee, Hoechang Kim, Dae-Ryong Jung contributed equally to this work.

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Author: Woojin Lee - Hoechang Kim - Dae-Ryong Jung - Jongmin Kim - Changwoo Nahm - Junhee Lee - Suji Kang - Byungho Lee - Byungwoo

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