Surface plasmon inhibited photo-luminescence activation in CdSe/ZnS core-shell quantum dots

J Phys Condens Matter. 2016 Jun 29;28(25):254001. doi: 10.1088/0953-8984/28/25/254001. Epub 2016 May 11.

Abstract

In a composite film of Cd x Se y Zn1-x S1-y gradient core-shell quantum dots (QDs) and gold nanorods (NRs), the optical properties of the QDs are drastically affected by the plasmonic nanoparticles. We provide a careful study of the two-step formation of the film and its morphology. Subsequently we focus on QD luminescence photoactivation-a process induced by photochemical changes on the QD surface. We observe that even a sparse coverage of AuNRs can completely inhibit the photoactivation of the QDs' emission in the film. We demonstrate that the inhibition can be accounted for by a rapid energy transfer between QDs and AuNRs. Finally, we propose that the behavior of emission photoactivation can be used as a signature to distinguish between energy and electron transfer in the QD-based materials.

Publication types

  • Research Support, Non-U.S. Gov't