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Journal of Nanomaterials
Volume 2012, Article ID 719169, 5 pages
Research Article

Employing Photoassisted Ligand Exchange Technique in Layered Quantum Dot LEDs

1Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
2Engineering Science and Machines, The Pennsylvania State University, University Park, PA 16802, USA
3Institute for Lasers, Photonics and Biophotonics, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA

Received 28 August 2011; Accepted 31 October 2011

Academic Editor: Fan Zhang

Copyright © 2012 Wenjia Hu et al. 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.


We presented in this paper a photoassisted ligand exchange approach whereby light will be introduced to facilitate the replacement of oleic acid (OA) ligand molecules over PbSe quantum dots (QDs). The ligand-exchanged QDs were used to fabricate quantum dot light-emitting-diodes (QD-LEDs), which outperform the devices comprising the QDs without ligand-replacement.