Key Laboratory of Excited-State Materials of Zhejiang Province, and Department of Chemistry, Zhejiang University, Hangzhou 310027, China.
State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China.
J Am Chem Soc. 2022 May 18;144(19):8444-8448. doi: 10.1021/jacs.2c01498. Epub 2022 May 10.
Presynthesized CdSe/CdS core/shell quantum dots (QDs) are two-dimensionally (2D) and epitaxially fused in solution to form a CdS nanoplatelet with multiple epitaxially embedded CdSe QDs (CdSe@CdS coupled-dots@platelet). In addition to providing spatial confinement for the excitonic states of multiple CdSe QDs in a CdS nanoplatelet, the continuous and single-crystalline nanoplatelet with controlled thickness enables quantum coupling between the CdSe QDs, resulting in inhomogeneous-free optical properties for the colloidal CdSe@CdS coupled-dots@nanoplatelets with bright photoluminescence. The results here suggest that solution synthesis can offer a simple means to obtain semiconductor nanocrystals for realizing unique yet complex excitonic properties that are otherwise difficult to achieve.
预合成的 CdSe/CdS 核/壳量子点（QDs）在溶液中二维（2D）和外延融合，形成具有多个外延嵌入 CdSe QD 的 CdS 纳米板（CdSe@CdS 耦合点@板）。除了为 CdS 纳米板中的多个 CdSe QD 的激子态提供空间限制外，具有可控厚度的连续单晶纳米板还允许 CdSe QD 之间发生量子耦合，从而使胶体 CdSe@CdS 耦合点@纳米板的光学性质均匀，具有明亮的光致发光。这里的结果表明，溶液合成可以为获得半导体纳米晶体提供一种简单的方法，以实现独特但复杂的激子性质，否则这些性质很难实现。
