One\|pot Synthesis of CdS Quantum  Dots and Their Quantum Yields

Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (5): 1043.

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One\|pot Synthesis of CdS Quantum Dots and Their Quantum Yields

WANG Li¹, WANG Jin¹, CHEN Yan², ZHONG Hong-Hai², JIANG Yang^2*

1. School of Chemical Engineering;
2. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China

Received:2010-08-20 Revised:2010-12-29 Online:2011-05-10 Published:2011-04-11
Contact: JIANG Yang E-mail:apjiang2002@yahoo.com
Supported by:
国家“八六三”计划项目(批准号: 2007AA03Z301)、国家“九七三”计划项目(批准号: 2007CB9-36001)、国家自然科学基金(批准号: 20771032, 61076040)和教育部“新世纪优秀人才支持计划”项目(批准号: NCET-04-0561)资助.

Abstract

Abstract: CdS QDs were synthesized via one-pot method, with ODE as the solvent and oleic acid as capping ligands. The influences of reaction time, reaction temperature and Cd/S molar ratio on optical properties of CdS QDs were studied. The zinc-blende, monodisperse and high-crystalline structures of CdS QDs were characterized by means of XRD and HRTEM. The good monodisperse size distribution and optical properties were also confirmed by UV-vis and PL. The PL spectra are symmetrical, and their full-width at half-maximum (FWHM) is samll. The first absorption peak is very sharp. The growth temperature and the initial Cd/S molar ratio have important influences on the size and photoluminescence quantum yields (PLQY) of CdS QDs. It has been demonstrated that high photoluminescence quantum yields with nearly monodisperse CdS nanocrystals can be obtained by a judicious choice of the Cd:S molar ratio (3:1) and the growth temperature (240℃), and the PLQY is about 30%.

Key words: Quantum dots, CdS, One-pot synthesis, Quantum yields

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WANG Li, WANG Jin, CHEN Yan, ZHONG Hong-Hai, JIANG Yang*. One\|pot Synthesis of CdS Quantum Dots and Their Quantum Yields[J]. Chem. J. Chinese Universities, 2011, 32(5): 1043.

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One\|pot Synthesis of CdS Quantum Dots and Their Quantum Yields

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