St Andrews Research Repository

St Andrews University Home
View Item 
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  • Login
JavaScript is disabled for your browser. Some features of this site may not work without it.

Exciton efficiency beyond the spin statistical limit in organic light emitting diodes based on anthracene derivatives

Thumbnail
View/Open
Anthracene_paper_accepted.pdf (5.905Mb)
Date
28/01/2020
Author
Sharma, Nidhi
Wong, Michael Yin
Hall, David
Spuling, Eduard
Tenopala Carmona, Francisco
Privitera, Alberto
Copley, Graeme Jeffrey
Cordes, David Bradford
Slawin, Alexandra Martha Zoya
Murawski, Caroline
Gather, Malte Christian
Beljonne, David
Olivier, Yoann
Samuel, Ifor D. W.
Zysman-Colman, Eli
Funder
The Leverhulme Trust
EPSRC
EPSRC
European Commission
European Commission
Grant ID
RPG-2016-047
EP/P010482/1
EP/P010482/1
703387
799302
Keywords
QD Chemistry
DAS
Metadata
Show full item record
Altmetrics Handle Statistics
Altmetrics DOI Statistics
Abstract
We report two donor-acceptor (D-A) materials based on a cyanoanthracene acceptor paired with diphenylamine ( DPAAnCN ) and carbazole ( CzAnCN ) donor moieties. These compounds show hybrid locally excited (LE) charge-transfer (CT) excited states (HLCT), which we demonstrated through a combined photophysical and computational study. Vacuum- deposited organic light emitting diodes (OLEDs) using these HLCT emitters exhibit maximum external quantum efficiencies (EQEmax) close to 6%, with impressive exciton utilization efficiency (Φs) of >50%, far exceeding the spin statistic limit of 25%. We rule out triplet-triplet annihilation and thermally activated delayed fluorescence as triplet harvesting mechanisms along with horizontal orientation of emitters to enhance light outcoupling and, instead, propose a “hot exciton” channel involving the nearly isoenergetic T2 and S1 states.
Citation
Sharma , N , Wong , M Y , Hall , D , Spuling , E , Tenopala Carmona , F , Privitera , A , Copley , G J , Cordes , D B , Slawin , A M Z , Murawski , C , Gather , M C , Beljonne , D , Olivier , Y , Samuel , I D W & Zysman-Colman , E 2020 , ' Exciton efficiency beyond the spin statistical limit in organic light emitting diodes based on anthracene derivatives ' , Journal of Materials Chemistry C , vol. In press . https://doi.org/10.1039/C9TC06356K
Publication
Journal of Materials Chemistry C
Status
Peer reviewed
DOI
https://doi.org/10.1039/C9TC06356K
ISSN
2050-7526
Type
Journal article
Rights
Copyright © 2020 The Author(s). This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1039/C9TC06356K
Description
E.Z.-C. acknowledges the University of St Andrews and the Leverhulme Trust (RPG- 2016-047) for financial support. E.Z.-C. and I.D.W.S. thank EPSRC (EP/P010482/1) for support. We thank EPSRC UK National Mass Spectrometry Facility at Swansea University for analytical services. The work in Mons was supported by the European Union’s Horizon 2020 research and innovation program under Grant Agreement N°. 646176 (EXTMOS project). Computational resources have been provided by the Consortium des Équipements de Calcul Intensif (CÉCI), funded by the Fonds de la Recherche Scientifiques de Belgique (F.R.S.- FNRS) under Grant No. 2.5020.11. C.M. and G.C acknowledge funding by the European Commission through a Marie Skłodowska Curie fellowship (No. 703387 and 799302, respectively). M.C.G. acknowledges funding from EPSRC (EP/R010595/1). A.P. acknowledges the European Union’s Horizon 2020 research and innovation programme under Marie Sklodowska Curie Grant agreement No. 722651 (SEPOMO project). EPR measurements were performed in the Centre for Advanced ESR (CAESR), located in the Department of Chemistry of the University of Oxford, and this work was supported by the EPSRC (EP/L011972/1).
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/21337

Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

Advanced Search

Browse

All of RepositoryCommunities & CollectionsBy Issue DateNamesTitlesSubjectsClassificationTypeFunderThis CollectionBy Issue DateNamesTitlesSubjectsClassificationTypeFunder

My Account

Login

Open Access

To find out how you can benefit from open access to research, see our library web pages and Open Access blog. For open access help contact: openaccess@st-andrews.ac.uk.

Accessibility

Read our Accessibility statement.

How to submit research papers

The full text of research papers can be submitted to the repository via Pure, the University's research information system. For help see our guide: How to deposit in Pure.

Electronic thesis deposit

Help with deposit.

Repository help

For repository help contact: Digital-Repository@st-andrews.ac.uk.

Give Feedback

Cookie policy

This site may use cookies. Please see Terms and Conditions.

Usage statistics

COUNTER-compliant statistics on downloads from the repository are available from the IRUS-UK Service. Contact us for information.

© University of St Andrews Library

University of St Andrews is a charity registered in Scotland, No SC013532.

  • Facebook
  • Twitter