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Resonant energy transfer of triplet excitons from pentacene to PbSe nanocrystals.


Type

Article

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Authors

Tabachnyk, Maxim 
Ehrler, Bruno 
Gélinas, Simon 
Böhm, Marcus L 
Walker, Brian J 

Abstract

The efficient transfer of energy between organic and inorganic semiconductors is a widely sought after property, but has so far been limited to the transfer of spin-singlet excitons. Here we report efficient resonant-energy transfer of molecular spin-triplet excitons from organic semiconductors to inorganic semiconductors. We use ultrafast optical absorption spectroscopy to track the dynamics of triplets, generated in pentacene through singlet exciton fission, at the interface with lead selenide (PbSe) nanocrystals. We show that triplets transfer to PbSe rapidly (<1 ps) and efficiently, with 1.9 triplets transferred for every photon absorbed in pentacene, but only when the bandgap of the nanocrystals is close to resonance (±0.2 eV) with the triplet energy. Following triplet transfer, the excitation can undergo either charge separation, allowing photovoltaic operation, or radiative recombination in the nanocrystal, enabling luminescent harvesting of triplet exciton energy in light-emitting structures.

Description

Keywords

0303 Macromolecular and Materials Chemistry, 0299 Other Physical Sciences, 0306 Physical Chemistry (incl. Structural), 0205 Optical Physics

Journal Title

Nat Mater

Conference Name

Journal ISSN

1476-1122
1476-4660

Volume Title

13

Publisher

Springer Science and Business Media LLC
Sponsorship
Engineering and Physical Sciences Research Council (EP/M005143/1)
Engineering and Physical Sciences Research Council (EP/G060738/1)