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

0469143 - ÚFP 2017 RIV GB eng J - Journal Article
Chen, J. - Žídek, Karel - Abdellah, M. - Al-Marri, M.J. - Zheng, K. - Pullerits, T.
Surface plasmon inhibited photo-luminescence activation in CdSe/ZnS core-shell quantum dots.
Journal of Physics-Condensed Matter. Roč. 28, č. 25 (2016), č. článku 254001. ISSN 0953-8984. E-ISSN 1361-648X
Institutional support: RVO:61389021
Keywords : surface plasmon * gold nanorods * quantum dots * energy transfer * photoactivation
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 2.678, year: 2016
http://dx.doi.org/10.1088/0953-8984/28/25/254001

In a composite film of CdxSeyZn1−xS1−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.
Permanent Link: http://hdl.handle.net/11104/0267004