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Planar and rigid pyrazine based TADF emitter for deep blue bright organic light emitting diodes

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Rajamalli_2021_Planar_and_rigid_EJOC_202100086_CCBY.pdf (2.799Mb)
Date
28/04/2021
Author
Rajamalli, Pachaiyappan
Chen, Dongyang
Madayanad Suresh, Subeesh
Tsuchiya, Youichi
Adachi, Chihaya
Zysman-Colman, Eli
Funder
EPSRC
EPSRC
European Commission
European Commission
Grant ID
EP/P010482/1
EP/R035164/1
749557
838885
Keywords
Thermally activated delayed fluorescence
TADF
Pyrazine
Donor-acceptor
Organic light-emitting diodes
QD Chemistry
DAS
Metadata
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Abstract
Two blue thermally activated delayed fluorescence (TADF) emitters bearing di‐tert‐butyl carbazoles as the electron donor groups and pyrazine (DTCz‐Pz) or dipyrazine (DTCz‐Pz) as the electron acceptor are presented. The DFT calculations predict DTCz‐Pz and DTCz‐DPz to possess high S1 energies (3.19 eV and 3.08 eV, respectively), and relatively large ΔEST values (0.52 eV and 0.56 eV, respectively). The closely layered intermediate triplet states between S1 and T1 , predicted by DFT calculations, are expected to facilitate the reverse intersystem crossing (RISC) and improve spin‐vibronic coupling efficiency between the excited states even the relatively larger ΔESTs. The ΔESTs for DTCz‐Pz and DTCz‐DPz are 0.27 eV and 0.38 eV, and both molecules show high photoluminescence quantum yields (65%, and 70%, respectively) and the decay lifetimes show temperature dependence in a PPT host, which is consistent that both molecules are TADF emitters in PPT. The OLEDs based on DTCz‐Pz exhibit deep blue emission with λEL of 460 nm and CIE of (0.15, 0.16). The maximum external quantum efficiency (EQEmax) reaches 11.6%, with a maximum luminance (Lmax) of up to 6892 cd m‐2 , while the device based on DTCz‐DPz exhibits sky blue emission with λEL of 484 nm and CIE of (0.15, 0.30), an EQEmax of 7.2%, and Lmax of 8802 cd m‐2 .
Citation
Rajamalli , P , Chen , D , Madayanad Suresh , S , Tsuchiya , Y , Adachi , C & Zysman-Colman , E 2021 , ' Planar and rigid pyrazine based TADF emitter for deep blue bright organic light emitting diodes ' , European Journal of Organic Chemistry , vol. 2021 , no. 16 , pp. 2285-2293 . https://doi.org/10.1002/ejoc.202100086
Publication
European Journal of Organic Chemistry
Status
Peer reviewed
DOI
https://doi.org/10.1002/ejoc.202100086
ISSN
1434-193X
Type
Journal article
Rights
Copyright © 2021 The Authors. European Journal of Organic Chemistry 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: Engineering and Physical Sciences Research Council (Grant Number(s): EP/P010482/1, EP/R035164/1); H2020 Marie Skłodowska-Curie Actions (Grant Number(s): 749557, 838885); China Scholarship Council (Grant Number(s): 201603780001).
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/21623

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