Designed long lived emission from CdSe quantum dots by reversible electronic energy transfer with a surface bound chromophore

La Rosa, Marcello ; Denisov, Sergey ; Jonusauskas, Gediminas ; McClenaghan, Nathan ; Credi, Alberto (2018) Designed long lived emission from CdSe quantum dots by reversible electronic energy transfer with a surface bound chromophore. Angewandte Chemie International Edition, 57 . pp. 3104-3107.
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Abstract

The size-tunable emission of luminescent quantum dots (QDs) makes them highly interesting for applications that range from bioimaging to optoelectronics. For the same applications, engineering their luminescence lifetime – in particular, making it longer – would be as important; however, no rational methodology to reach this goal is available to date. Here we describe a strategy to prolong the emission lifetime of QDs by electronic energy shuttling to the triplet excited state of a surface-bound molecular chromophore. To implement this idea we made CdSe QDs of different sizes, and we self-assembled them with a pyrene derivative. We observed that the conjugates exhibit delayed luminescence, with emission decays that are prolonged by more than 3 orders of magnitude compared to the parent CdSe QDs (lifetimes up to 330 s). The mechanism invokes unprecedented reversible quantum dot-to-organic chromophore electronic energy transfer.

Abstract
Document type
Article
Creators
CreatorsAffiliationORCID
La Rosa, MarcelloUniversità di Bologna
Denisov, SergeyUniversite' de Bordeaux
Jonusauskas, GediminasUniversite' de Bordeaux
McClenaghan, NathanUniversite' de Bordeaux
Credi, AlbertoUniversità di Bologna
Subjects
DOI
Deposit date
30 Mar 2018 10:04
Last modified
23 May 2019 08:37
Project name
LEAPS - Light effected autonomous molecular pumps: Towards active transporters and actuating materials
Funding program
EC - H2020
URI

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