物理化学学报 >> 2010, Vol. 26 >> Issue (03): 691-694.doi: 10.3866/PKU.WHXB20100315

光化学与光谱 上一篇    下一篇

无膦方法合成高质量CdSe纳米晶及其光学性质

赵慧玲, 申怀彬, 王洪哲, 李林松   

  1. 河南大学物理与电子学院, 河南 开封 475004; 河南大学特种功能材料教育部重点实验室, 河南 开封 475004
  • 收稿日期:2009-08-29 修回日期:2009-12-01 发布日期:2010-03-03
  • 通讯作者: 李林松 E-mail:lsli@henu.edu.cn

Phosphine-Free Synthesis of High Quality CdSe Nanocrystals and Their Optical Properties

ZHAO Hui-Ling, SHEN Huai-Bin, WANG Hong-Zhe, LI Lin-Song   

  1. School of Physics and Electronics, Henan University, Kaifeng 475004, Henan Province, P. R. China; Key Laboratory for Special Functional Materials of Ministry of Education, Henan University, Kaifeng 475004, Henan Province, P. R. China
  • Received:2009-08-29 Revised:2009-12-01 Published:2010-03-03
  • Contact: LI Lin-Song E-mail:lsli@henu.edu.cn

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摘要：

以合成的十碳酸镉作为Cd前驱体, 十八烯作为单质硒溶剂, 并添加十八胺作为活性剂, 在无三丁基膦或三辛基膦参与的条件下, 以较低温度制备了具有闪锌矿结构的高质量的CdSe纳米晶. 利用吸收光谱、荧光光谱(PL)、X射线衍射(XRD)、透射电镜(TEM)对不同反应时间得到的CdSe纳米晶进行形貌和光谱性质表征. 实验结果表明, 采用该无膦法只需调控反应时间就可得到粒径均一、分散性好的CdSe纳米晶, 其荧光波长可覆盖470-630 nm的可见光区, 而荧光峰半高宽则始终保持在24-30 nm之间并具有较高的荧光量子产率(535 nm处大于60%). 最后, 对CdSe纳米晶量子产率随反应时间变化的原因进行了分析.

关键词: 无膦合成, 半导体纳米晶, CdSe, 光学性质

Abstract:

High quality zinc blende CdSe nanocrystals were successfully synthesized using an environmental friendly method. Pre-synthesized cadmium decanoate was used as the Cd precursor and selenium powder dissolved in octadecene was used as the Se precursor. The use of expensive and toxic tributylphosphine or trioctylphosphine was thus avoided. The properties and structures of the as-synthesized CdSe nanocrystals were characterized by absorption spectroscopy, photoluminescence (PL) spectroscopy, X-ray diffraction (XRD), and transmission electron microscopy (TEM). The PL emission peak of the as-synthesized CdSe nanocrystals could be easily tuned from470 to 630 nm using different reaction times. The quality of the crystals was high and this was confirmed by their high quantum yields (exceeding 60%at 535 nm) and their narrow size-distributions with full width at half maximum values between 24 and 30 nm.

Key words: Phosphine-free synthesis, Semicondutor Nanocrystal, CdSe, Optical property