Using shape to turn off blinking for two-colour multiexciton emission in CdSe/CdS tetrapods.

ABSTRACT: Semiconductor nanostructures capable of emitting from two excited states and thereby of producing two photoluminescence colours are of fundamental and potential technological significance. In this limited class of nanocrystals, CdSe/CdS core/arm tetrapods exhibit the unusual trait of two-colour (red and green) multiexcitonic emission, with green emission from the CdS arms emerging only at high excitation fluences. Here we show that by synthetic shape-tuning, both this multi-colour emission process, and blinking and photobleaching behaviours of single tetrapods can be controlled. Specifically, we find that the properties of dual emission and single-nanostructure photostability depend on different structural parameters-arm length and arm diameter, respectively-but that both properties can be

SUBMITTER: Mishra N 

PROVIDER: S-EPMC5437295 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature