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巨大的PbSe/CdSe/CdSe量子点:单个纳米晶体的超稳定近红外光发

Christina J Hanson¹, Nicolai F Hartmann¹, Ajay Singh¹

¹Materials Physics and Applications Division: Center for Integrated Nanotechnologies, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States.

Journal of the American Chemical Society

|July 19, 2017

概括

研究人员使用厚厚的化 (CdSe) 贝开发了光稳定的化量子点 (PbSe QD). 这种"巨型"QD方法显著提高了稳定性,减少了单发射器应用的光漂白和闪.

科学领域:

材料科学
纳米技术
物理化学

背景情况:

化量子点 (PbSe QD) 对光电子有希望,但其光稳定性较差.
环境的敏感性导致光漂白和闪,限制了它们的实际应用.

研究的目的:

通过使用厚厚的外来增强PbSe QD的光稳定性.
研究外晶体结构和配体控制在QD光发光和稳定性中的作用.

主要方法:

部分离子交换和连续离子层吸附和反应 (SILAR) 技术的连续应用.
在PbSe核心周围生长厚厚的化 (CdSe) .
通过在SILAR过程中添加或不添加三酸 (TOP) 连接物来控制合成.

主要成果:

成功创建了"巨型"PbSe/CdSe核心/外量子点,显著改善了光稳定性.
证明立方混合CdSe外产生明亮和稳定的单一发射器,与六角石外不同.
显示SILAR期间的配体存在会影响外晶体结构,粒子形状和发射特性.

结论:

厚厚的CdSe外有效地为PbSe QD传递单个QD级光稳定性.
CdSe外的立方晶体结构对于实现明亮和稳定的单发射器行为至关重要.
合成对生长的控制,包括配体管理,允许针对特定应用调整QD属性.

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