Colloidal Two‐Dimensional Systems: CdSe Quantum Shells and Wells

Thin CdSe layers (“quantum shells”) were epitaxially grown onto CdS nanocrystal templates. Their optical properties are dominated by the shell thickness despite the different bandgap and size of the templates. The emission of the CdSe quantum shells, which can be tuned by varying the shell thickness, ranges from 520 to 650 nm (see Figure), and the emission quantum yield can be increased to over 40 % by coating the quantum shells with epitaxially grown CdS thin layers (CdSe colloidal “quantum wells”). Supporting information for this article is available on the WWW under http://www.angewandte.org or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.