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Open Access Nano Express

Formation of PbSe/CdSe Core/Shell Nanocrystals for Stable Near-Infrared High Photoluminescence Emission

Yu Zhang12, Quanqin Dai1, Xinbi Li2, Qingzhou Cui3, Zhiyong Gu3, Bo Zou4, Yiding Wang1* and William W Yu12*

Author Affiliations

1 State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China

2 Department of Chemistry and Biochemistry, Worcester Polytechnic Institute, Worcester, MA, 01609, USA

3 Department of Chemistry Engineering, University of Massachusetts Lowell, Lowell, MA, 01854, USA

4 State Key Laboratory of Superhard Materials, Jilin University, Changchun, 130012, China

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Nanoscale Research Letters 2010, 5:1279-1283  doi:10.1007/s11671-010-9637-7

Published: 1 June 2010

Abstract

PbSe/CdSe core/shell nanocrystals with quantum yield of 70% were obtained by the “successive ion layer adsorption and reaction” technology in solution. The thickness of the CdSe shell was exactly controlled. A series of spectral red shifts with the CdSe shell growth were observed, which was attributed to the combined effect of the surface polarization and the expansion of carriers’ wavefunctions. The stability of PbSe nanocrystals was tremendously improved with CdSe shells.

Keywords:
PbSe; CdSe; Core–shell; Near infrared; Emission; Nanocrystals