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Journal of Nanomaterials
Volume 2012, Article ID 892506, 6 pages
http://dx.doi.org/10.1155/2012/892506
Research Article

Intense Visible Luminescence in CdSe Quantum Dots by Efficiency Surface Passivation with H2O Molecules

School of Physics and Energy Science, Kyungpook National University, Daegu 702-701, Republic of Korea

Received 27 July 2011; Accepted 23 October 2011

Academic Editor: Laécio Santos Cavalcante

Copyright © 2012 Hyeoung Woo Park and Do-Hyung Kim. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We have investigated the effect of water (H2O) cooling and heat treatment on the luminescence efficiency of core CdSe quantum dots (QDs). The photoluminescence (PL) quantum yield of the CdSe QDs was enhanced up to ~85%, and some periodic bright points were observed in wide color ranges during the heat treatment of QDs mixed with H2O. The PL enhancement of QDs could be attributed to the recovery of QDs surface traps by unreacted ligands confined within the hydrophilic H2O molecule containers.