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

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