An effective oxidation approach for luminescence enhancement in CdS quantum dots by H2O2

The effects of surface passivation on the photoluminescence (PL) properties of CdS nanoparticles oxidized by straightforward H 2 O 2 injection were examined. Compared to pristine cadmium sulfide nanocrystals (quantum efficiency ≅ 0.1%), the surface-passivated CdS nanoparticles showed significantly e...

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Bibliographic Details
Published in:Nanoscale research letters 2012-12, Vol.7 (1), p.672-672, Article 672
Main Authors: Lee, Woojin, Kim, Hoechang, Jung, Dae-Ryong, Kim, Jongmin, Nahm, Changwoo, Lee, Junhee, Kang, Suji, Lee, Byungho, Park, Byungwoo
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Materials Science
Molecular Medicine
Nano Express
Nanochemistry
Nanoscale Science and Technology
Nanotechnology
Nanotechnology and Microengineering
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Summary:The effects of surface passivation on the photoluminescence (PL) properties of CdS nanoparticles oxidized by straightforward H 2 O 2 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 H 2 O 2 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.
ISSN:1556-276X
1931-7573
1556-276X
DOI:10.1186/1556-276X-7-672