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Improving processability and efficiency of Resonant TADF emitters : a design strategy

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Date
03/12/2019
Author
Hall, David
Madayanad Suresh, Subeesh
dos Santos, Paloma Lays
Duda, Eimantas
Bagnich, Sergey
Pershin, Anton
Pachai Gounder, Rajamalli
Cordes, David Bradford
Slawin, Alexandra Martha Zoya
Belijonne, David
Köhler, Anna
Samuel, Ifor David William
Olivier, Yoann
Zysman-Colman, Eli
Funder
European Commission
The Leverhulme Trust
EPSRC
Grant ID
812872
RPG-2016-047
EP/P010482/1
Keywords
Blue emission
Multiresonance thermally activated delayed fluorescence
Organic light emitting diodes
SCS-CC2 approach
QD Chemistry
DAS
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Abstract
A new design strategy is introduced to address a persistent weakness with resonance thermally activated delayed fluorescence (R-TADF) emitters to reduce aggregation-caused quenching effects, which we identify as one of the key limiting factors. The emitter Mes3DiKTa shows an improved photoluminescence quantum yield of 80% compared to 75% for the reference DiKTa in 3.5 wt% mCP. Importantly, emission from aggregates, even at high doping concentrations, is eliminated and aggregation-caused quenching is strongly curtailed. For both molecules, triplets are almost quantitatively upconverted into singlets in electroluminescence, despite a significant (~0.21 eV) singlet-triplet energy gap (ΔEST), in line with correlated quantum-chemical calculations, and a slow reverse intersystem crossing. We speculate that the lattice stiffness responsible for the narrow fluorescence and phosphorescence emission spectra also protects the triplets against non-radiative decay. An improved EQEmax of 21.1% for Mes3DIKTa compared to the parent DiKTa (14.7%) and, importantly, reduced efficiency roll- off compared to literature resonance TADF OLEDs, shows the promise of this design strategy for future design of R-TADF emitters for OLED applications.
Citation
Hall , D , Madayanad Suresh , S , dos Santos , P L , Duda , E , Bagnich , S , Pershin , A , Pachai Gounder , R , Cordes , D B , Slawin , A M Z , Belijonne , D , Köhler , A , Samuel , I D W , Olivier , Y & Zysman-Colman , E 2019 , ' Improving processability and efficiency of Resonant TADF emitters : a design strategy ' , Advanced Optical Materials , vol. Early View , 1901627 . https://doi.org/10.1002/adom.201901627
Publication
Advanced Optical Materials
Status
Peer reviewed
DOI
https://doi.org/10.1002/adom.201901627
ISSN
2195-1071
Type
Journal article
Rights
Copyright © 2019 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Description
This work is funded by the EC through the Horizon 2020 Marie Sklodowska-Curie ITN project TADFlife. The St Andrews team would also like to thank the Leverhulme Trust (RPG-2016- 047) and EPSRC (EP/P010482/1) for financial support. 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, as well as the Tier-1 supercomputer of the Fédération Wallonie-Bruxelles, infrastructure funded by the Walloon Region under the grant agreement n1117545. AP acknowledges the financial support from the Marie Curie Fellowship (MILORD project, N°. 748042). DB is a FNRS Research Director. We thank Franck-Julian Kahle for support with data analysis.
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URI
http://hdl.handle.net/10023/19066

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