Accès direct au contenu

PPSM

Version anglaise

aide

Accueil > Publications / brevets > Publications équipe SMALL > Détection Polluantes fluo

Recherche - Valorisation

Delayed Molecular Triplet Generation from Energized Lead Sulfide Quantum Dots

Garakyaraghi, S; Mongin, C; Granger, DB; Anthony, JE; Castellano, FN, Journal of Physical Chemistry Letters, 2017, 8, 1458-1463.

Références :

Journal of Physical Chemistry Letters, 2017, 8, 1458-1463.

Auteur(s) : 

Garakyaraghi, S; Mongin, C; Granger, DB; Anthony, JE; Castellano, FN

The generation and transfer of triplet excitons across the molecular–semiconductor interface represents an important technological breakthrough featuring numerous fundamental scientific questions. This contribution demonstrates curious delayed formation of TIPS–pentacene molecular triplet excitons bound on the surface of PbS nanocrystals mediated through the initial production of a proposed charge transfer intermediate following selective excitation of the PbS quantum dots. Ultrafast UV–vis and near-IR transient absorption spectroscopy was used to track the dynamics of the initial PbS exciton quenching as well as time scale of the formation of molecular triplet excited states that persisted for 10 μs on the PbS surface, enabling subsequent energy and electron transfer reactivity. These results provide the pivotal proof-of-concept that PbS nanocrystals absorbing near-IR radiation can ultimately generate molecular triplets on their surfaces through processes distinct from direct Dexter triplet energy transfer. More broadly, this work establishes that small metal chalcogenide semiconductor nanocrystals interfaced with molecular chromophores exhibit behavior reminiscent of supramolecular chemical systems, a potentially impactful concept for nanoscience.

ga
Type :
Publication
Dates :
Paru le 6 avril 2017
Informations complémentaires :
DOI: 10.1021/acs.jpclett.7b00546

 

Publications antérieures 

2015
2014
2013
2012
2011
2010
2009
2008
2007

Recherche d'un document

Recherche d'un document