Continuously Tunable Emission in Inverted Type-I CdS/ CdSe Core/Crown Semiconductor Nanoplatelets

nanoribbons, [ 10 ] and most recently nanoplatelets (NPLs) [ 11 ] have been successfully synthesized. In these solution-processed quantum structures, an additional epitaxial growth of semiconductor shell around the starting semiconductor core leads to various architectures of nanocrystal heterostructures. By doing so, physical properties can be elegantly modifi ed with precisely controlling distribution of the composition across the heterostructure. These colloidal heteronanocrystals are possibly the best candidates for excitonic engineering and present attractive opportunities for enhanced platforms of colloidal photonics. [ 12 ] Previously, various solution-processed core/ shell quantum dots and rods have been studied for excitonically engineered properties. For example, Type-I CdSe/ZnSe core/ shell nanocrystals [ 13 ] and ZnSe/CdSe core/shell nanocrystals tunable between inverted Type-I and Type-II [ 14 ] were reported. With precise control of the shell, optical properties of core-only nanocrystals including quantum yield, [ 15 ] photostability, [ 16 ] and reduction of fl uorescence emission blinking [ 17,18 ] can be greatly enhanced, which thus make them highly attractive for colloidal LEDs, [ 19 ] colloidal lasers, [ 20 ] and biological imaging. [ 17 ]