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Efficient sky-blue organic light-emitting diodes using a highly horizontally oriented thermally activated delayed fluorescence emitter

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Zhang_2020_Efficient_sky_blue_ADOM_2001354_CCBY.pdf (1.358Mb)
Date
03/12/2020
Author
Zhang, Zhen
Crovini, Ettore
dos Santos, Paloma Lays
Naqvi, Bilal A.
Cordes, David Bradford
Slawin, Alexandra Martha Zoya
Sahay, Prakhar
Brütting, Wolfgang
Samuel, Ifor David William
Bräse, Stefan
Zysman-Colman, Eli
Funder
EPSRC
EPSRC
European Commission
Grant ID
EP/P010482/1
EP/P010482/1
812872
Keywords
TADF emitters
Horizontal orientation
Outcoupling effect
Indolocarbazole
Triazine
Acceptor-donor-acceptor
Blue emitters
OLEDs
QC Physics
QD Chemistry
TK Electrical engineering. Electronics Nuclear engineering
DAS
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Abstract
Organic thermally activated delayed fluorescent (TADF) materials can harvest 100% of the electrically generated excitons as a result of their small singlet-triplet energy difference. However, maximizing the External Quantum Efficiency (EQE) of a device also requires enhancing the light-outcoupling efficiency. In this work, we present a new Acceptor-Donor-Acceptor (ADA) emitter employing an indolocarbazole donor and diphenyltriazine acceptors that shows nearly-completely horizontal orientation regardless of the host matrix, leading to a sky-blue OLED (λEL=483nm, CIE coordinates of 0.17, 0.32) with EQEMAX of 22.1%, a maximum luminance of 7800 cd/m2 and blue emission.
Citation
Zhang , Z , Crovini , E , dos Santos , P L , Naqvi , B A , Cordes , D B , Slawin , A M Z , Sahay , P , Brütting , W , Samuel , I D W , Bräse , S & Zysman-Colman , E 2020 , ' Efficient sky-blue organic light-emitting diodes using a highly horizontally oriented thermally activated delayed fluorescence emitter ' , Advanced Optical Materials , vol. 8 , no. 23 , 2001354 . https://doi.org/10.1002/adom.202001354
Publication
Advanced Optical Materials
Status
Peer reviewed
DOI
https://doi.org/10.1002/adom.202001354
ISSN
2195-1071
Type
Journal article
Rights
Copyright © 2020 The Authors. Published by Wiley‐VCH GmbH. 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
Funding: Deutsche Forschungsgemeinschaft (Grant Number(s): SFB1176), Engineering and Physical Sciences Research Council (Grant Number(s): EP/P010482/1), China Scholarship Council (Grant Number(s): 201606890009), H2020 Marie Skłodowska-Curie Actions (Grant Number(s): 812872).
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/20813

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