高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (5): 1043.

• 研究论文 • 上一篇    下一篇

CdS量子点的一步法合成及量子产率

王莉1,汪瑾1,陈艳2,仲洪海2,蒋阳2   

  1. 1. 合肥工业大学化学工程学院, 
    2.  材料科学与工程学院, 合肥 230009
  • 收稿日期:2010-08-20 修回日期:2010-12-29 出版日期:2011-05-10 发布日期:2011-04-11
  • 通讯作者: 蒋阳 E-mail:apjiang2002@yahoo.com
  • 基金资助:

    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.

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

WANG Li1, WANG Jin1, CHEN Yan2, ZHONG Hong-Hai2, JIANG Yang2*   

  1. 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.

摘要: 以油酸为配位体,十八烯为溶剂,采用一步法合成了CdS量子点,研究了反应温度、反应时间和Cd/S的摩尔比对量子点光谱性能的影响。X射线衍射(XRD)、高分辨透射电镜(HRTEM)测试表明所获得的CdS量子点为立方闪锌矿结构,且尺寸分布均一、结晶度高。其强的带边发光、尖锐的紫外吸收峰以及狭窄的荧光发射峰进一步表明量子点的单分散性及优异的光学性质。反应温度和Cd/S的摩尔比对CdS量子点尺寸大小、荧光量子产率均有重要的影响。当Cd/S=3:1、生长温度为240℃时,得到的CdS量子点单分散性好且荧光量子产率较高,其量子产率达到30%。

关键词: 量子点, CdS, 一锅煮法, 量子产率

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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