高等学校化学学报 ›› 2012, Vol. 33 ›› Issue (07): 1383-1388.doi: 10.3969/j.issn.0251-0790.2012.07.004

• 研究论文: 无机化学 • 上一篇    下一篇

液体石蜡体系中CdSeS三元量子点的制备及性能

张德龙, 李万万, 王解兵, 孙康   

  1. 上海交通大学金属基复合材料国家重点实验室, 上海 200240
  • 收稿日期:2011-12-01 出版日期:2012-07-10 发布日期:2012-07-10
  • 通讯作者: 李万万, 男, 博士, 副研究员, 主要从事无机微纳米发光材料及其应用研究. E-mail: wwli@sjtu.edu.cn E-mail:wwli@sjtu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 50902093)和上海市科委国际合作项目(批准号: 10520706500)资助.

Preparation and Properties of High-quality CdSeS Alloyed Quantum Dots in Liquid Paraffin

ZHANG De-Long, LI Wan-Wan, WANG Xie-Bing, SUN Kang   

  1. State Key Lab of Metal Matrix Composites Matericals, Shanghai Jiaotong University, Shanghai 200240, China
  • Received:2011-12-01 Online:2012-07-10 Published:2012-07-10

摘要: 采用液体石蜡为反应溶剂, 油酸为Cd源的溶剂和配体, 在无磷条件下通过用高温热解法合成了高质量的CdSeS三元合金量子点. 用透射电子显微镜(TEM), X射线粉末衍射仪(XRD)和能量色散X射线分析仪(EDX)等对产物的性能进行了表征. 结果表明, 反应温度、 反应时间和Se与S的比例等因素均对量子点的生长过程及光学性能产生影响. 采用该方法制得的CdSeS三元合金量子点均为立方闪锌矿结构, 且形成了一种内富S外富Se的成分梯度结构, 其最大发射波长可在370~595 nm(近紫外~橙红色)范围内连续可调, 量子效率最高可达65%. 该体系下制备的CdSeS三元量子点具有良好的热稳定性和光稳定性.

关键词: 三元量子点, CdSeS, 液体石蜡, 热稳定性, 光稳定性

Abstract: A phosphine-free route was successfully developed to prepare highly-quality cadmium selenium sulfide(CdSeS) alloyed quantum dots(QDs) using paraffin liquid as the reaction solvent and oleic acid as the ligand. The effects of the reaction temperature, growth time, and the molar ratio of S to Se on the properties of the CdSeS QDs were investigated. The as-prepared alloyed CdSeS QDs with zinc-blend crystalline structure possess a broad emission spectral ranging from 370 nm to 595 nm(from near-ultraviolet to salmon pink) and high photoluminescence quantum yield(PLQY) up to 65%. Moreover, the as-prepared alloyed CdSeS QDs with a gradient "CdS-rich core/CdSe-rich surface" structure also demonstrate good optical stabilities against the temperature change and photobleaching, which suggests their promising application on photoelectric devices and biological fluorescent labeling.

Key words: Ternary alloyed quantum dots, CdSeS, Liquid paraffin, Thermal stability, Optical stability

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