Mesogenic Groups Control the Emitter Orientation in Multi-Resonance TADF Emitter Films**

Dongyang Chen; Francisco Tenopala-Carmona; Julius A. Knöller; Andreas Mischok; David Hall; Subeesh Madayanad Suresh; Tomas Matulaitis; Yoann Olivier; Pierre Nacke; Frank Gießelmann; Sabine Laschat; Malte C. Gather; Eli Zysman-Colman

doi:10.1002/anie.202218911

Mesogenic Groups Control the Emitter Orientation in Multi-Resonance TADF Emitter Films**

Dongyang Chen
, Francisco Tenopala-Carmona
, Julius A. Knöller
, Andreas Mischok
, David Hall
, Subeesh Madayanad Suresh
, Tomas Matulaitis
, Yoann Olivier
, Pierre Nacke
, Frank Gießelmann
, Sabine Laschat
, Malte C. Gather
, Eli Zysman-Colman

Namur Institute of Structured Matter

Research output: Contribution to journal › Article › peer-review

Abstract

The use of thermally activated delayed fluorescence (TADF) emitters and emitters that show preferential horizontal orientation of their transition dipole moment (TDM) are two emerging strategies to enhance the efficiency of OLEDs. We present the first example of a liquid crystalline multi-resonance TADF (MR-TADF) emitter, DiKTa-LC. The compound possesses a nematic liquid crystalline phase between 80 °C and 110 °C. Importantly, the TDM of the spin-coated film shows preferential horizontal orientation, with an anisotropy factor, a, of 0.28, which is preserved in doped poly(vinylcarbazole) films. Green-emitting (λ_EL=492 nm) solution-processed OLEDs based on DiKTa-LC showed an EQE_max of 13.6 %. We thus demonstrate for the first time how self-assembly of a liquid crystalline TADF emitter can lead to the so-far elusive control of the orientation of the transition dipole in solution-processed films, which will be of relevance for high-performance solution-processed OLEDs.

Original language	English
Article number	e202218911
Journal	Angewandte Chemie. International edition
Volume	62
Issue number	16
DOIs	https://doi.org/10.1002/anie.202218911
Publication status	Published - 11 Apr 2023

Funding

The St Andrews team would also like to thank EPSRC (EP/P010482/1) and the Leverhulme Trust (RPG-2016-047) for financial support. E.Z.-C. was a Royal Society Leverhulme Trust Senior Research Fellow (SRF\R1\201089). D.C thanks the China Scholarship Council (No. 201603780001). This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska Curie grant agreement No 838885 (NarrowbandSSL) and S.M.S. acknowledges support for the Marie Skłodowska-Curie Individual Fellowship. 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. Y.O. acknowledges funding by the Fonds de la Recherche Scientifique-FNRS under Grant n° F.4534.21 (MIS-IMAGINE). M.C.G. acknowledges support from the Alexander von Humboldt Foundation (Humboldt Professorship). A.M. acknowledges funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 101023743 (PolDev). F.T.C. thanks Dr. Chang-Ki Moon for his support in the optical modelling with anisotropic optical constants. Generous financial support by the Studienstiftung des deutschen Volkes (Ph.D. fellowship for J.A.K.), the Ministerium für Wissenschaft, Forschung und Kunst des Landes Baden-Württemberg and the Carl Schneider Stiftung Aalen (shared instrumentation grant) are gratefully acknowledged. We thank Prof. Duncan Bruce for initial discussions and Callum Prentice for providing samples of DiKTa and Mes3DiKTa. The St Andrews team would also like to thank EPSRC (EP/P010482/1) and the Leverhulme Trust (RPG‐2016‐047) for financial support. E.Z.‐C. was a Royal Society Leverhulme Trust Senior Research Fellow (SRF\R1\201089). D.C thanks the China Scholarship Council (No. 201603780001). This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska Curie grant agreement No 838885 (NarrowbandSSL) and S.M.S. acknowledges support for the Marie Skłodowska‐Curie Individual Fellowship. 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. Y.O. acknowledges funding by the Fonds de la Recherche Scientifique‐FNRS under Grant n° F.4534.21 (MIS‐IMAGINE). M.C.G. acknowledges support from the Alexander von Humboldt Foundation (Humboldt Professorship). A.M. acknowledges funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska‐Curie grant agreement No. 101023743 (PolDev). F.T.C. thanks Dr. Chang‐Ki Moon for his support in the optical modelling with anisotropic optical constants. Generous financial support by the Studienstiftung des deutschen Volkes (Ph.D. fellowship for J.A.K.), the Ministerium für Wissenschaft, Forschung und Kunst des Landes Baden‐Württemberg and the Carl Schneider Stiftung Aalen (shared instrumentation grant) are gratefully acknowledged. We thank Prof. Duncan Bruce for initial discussions and Callum Prentice for providing samples of and . DiKTa MesDiKTa 3

Funders	Funder number
Carl Schneider Stiftung Aalen
H2020 Marie Skłodowska-Curie Actions
Ministerium für Wissenschaft, Forschung und Kunst Baden-Württemberg
MIS‐IMAGINE
European Commission
Consortium des Équipements de Calcul Intensif
Studienstiftung des Deutschen Volkes
Fonds de la Recherche Scientifiques de Belgique
Fédération Wallonie-Bruxelles
Alexander von Humboldt-Stiftung
Royal Society Leverhulme Trust	SRF\R1\201089
Horizon 2020	101023743
China Scholarship Council	201603780001
Fonds De La Recherche Scientifique - FNRS	2.5020.11, F.4534.21
Engineering and Physical Sciences Research Council	EP/P010482/1
Horizon 2020 Framework Programme	838885
Leverhulme Trust	RPG‐2016‐047

Keywords

Liquid Crystals
OLEDs
Thermally Activated Delayed Fluorescence
Transition Dipole Moment

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10.1002/anie.202218911

Cite this

Chen, D., Tenopala-Carmona, F., Knöller, J. A., Mischok, A., Hall, D., Madayanad Suresh, S., Matulaitis, T., Olivier, Y., Nacke, P., Gießelmann, F., Laschat, S., Gather, M. C., & Zysman-Colman, E. (2023). Mesogenic Groups Control the Emitter Orientation in Multi-Resonance TADF Emitter Films**. Angewandte Chemie. International edition, 62(16), Article e202218911. https://doi.org/10.1002/anie.202218911

@article{88dd6048149045de8b1405e1a6346407,

title = "Mesogenic Groups Control the Emitter Orientation in Multi-Resonance TADF Emitter Films**",

abstract = "The use of thermally activated delayed fluorescence (TADF) emitters and emitters that show preferential horizontal orientation of their transition dipole moment (TDM) are two emerging strategies to enhance the efficiency of OLEDs. We present the first example of a liquid crystalline multi-resonance TADF (MR-TADF) emitter, DiKTa-LC. The compound possesses a nematic liquid crystalline phase between 80 °C and 110 °C. Importantly, the TDM of the spin-coated film shows preferential horizontal orientation, with an anisotropy factor, a, of 0.28, which is preserved in doped poly(vinylcarbazole) films. Green-emitting (λEL=492 nm) solution-processed OLEDs based on DiKTa-LC showed an EQEmax of 13.6 \%. We thus demonstrate for the first time how self-assembly of a liquid crystalline TADF emitter can lead to the so-far elusive control of the orientation of the transition dipole in solution-processed films, which will be of relevance for high-performance solution-processed OLEDs.",

keywords = "Liquid Crystals, OLEDs, Thermally Activated Delayed Fluorescence, Transition Dipole Moment",

author = "Dongyang Chen and Francisco Tenopala-Carmona and Kn{\"o}ller, \{Julius A.\} and Andreas Mischok and David Hall and \{Madayanad Suresh\}, Subeesh and Tomas Matulaitis and Yoann Olivier and Pierre Nacke and Frank Gie{\ss}elmann and Sabine Laschat and Gather, \{Malte C.\} and Eli Zysman-Colman",

note = "Publisher Copyright: {\textcopyright} 2023 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.",

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doi = "10.1002/anie.202218911",

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Chen, D, Tenopala-Carmona, F, Knöller, JA, Mischok, A, Hall, D, Madayanad Suresh, S, Matulaitis, T, Olivier, Y, Nacke, P, Gießelmann, F, Laschat, S, Gather, MC & Zysman-Colman, E 2023, 'Mesogenic Groups Control the Emitter Orientation in Multi-Resonance TADF Emitter Films**', Angewandte Chemie. International edition, vol. 62, no. 16, e202218911. https://doi.org/10.1002/anie.202218911

TY - JOUR

T1 - Mesogenic Groups Control the Emitter Orientation in Multi-Resonance TADF Emitter Films**

AU - Chen, Dongyang

AU - Tenopala-Carmona, Francisco

AU - Knöller, Julius A.

AU - Mischok, Andreas

AU - Hall, David

AU - Madayanad Suresh, Subeesh

AU - Matulaitis, Tomas

AU - Olivier, Yoann

AU - Nacke, Pierre

AU - Gießelmann, Frank

AU - Laschat, Sabine

AU - Gather, Malte C.

AU - Zysman-Colman, Eli

PY - 2023/4/11

Y1 - 2023/4/11

N2 - The use of thermally activated delayed fluorescence (TADF) emitters and emitters that show preferential horizontal orientation of their transition dipole moment (TDM) are two emerging strategies to enhance the efficiency of OLEDs. We present the first example of a liquid crystalline multi-resonance TADF (MR-TADF) emitter, DiKTa-LC. The compound possesses a nematic liquid crystalline phase between 80 °C and 110 °C. Importantly, the TDM of the spin-coated film shows preferential horizontal orientation, with an anisotropy factor, a, of 0.28, which is preserved in doped poly(vinylcarbazole) films. Green-emitting (λEL=492 nm) solution-processed OLEDs based on DiKTa-LC showed an EQEmax of 13.6 %. We thus demonstrate for the first time how self-assembly of a liquid crystalline TADF emitter can lead to the so-far elusive control of the orientation of the transition dipole in solution-processed films, which will be of relevance for high-performance solution-processed OLEDs.

AB - The use of thermally activated delayed fluorescence (TADF) emitters and emitters that show preferential horizontal orientation of their transition dipole moment (TDM) are two emerging strategies to enhance the efficiency of OLEDs. We present the first example of a liquid crystalline multi-resonance TADF (MR-TADF) emitter, DiKTa-LC. The compound possesses a nematic liquid crystalline phase between 80 °C and 110 °C. Importantly, the TDM of the spin-coated film shows preferential horizontal orientation, with an anisotropy factor, a, of 0.28, which is preserved in doped poly(vinylcarbazole) films. Green-emitting (λEL=492 nm) solution-processed OLEDs based on DiKTa-LC showed an EQEmax of 13.6 %. We thus demonstrate for the first time how self-assembly of a liquid crystalline TADF emitter can lead to the so-far elusive control of the orientation of the transition dipole in solution-processed films, which will be of relevance for high-performance solution-processed OLEDs.

KW - Liquid Crystals

KW - OLEDs

KW - Thermally Activated Delayed Fluorescence

KW - Transition Dipole Moment

UR - https://www.scopus.com/pages/publications/85149374986

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DO - 10.1002/anie.202218911

M3 - Article

C2 - 36760211

AN - SCOPUS:85149374986

SN - 1433-7851

VL - 62

JO - Angewandte Chemie. International edition

JF - Angewandte Chemie. International edition

IS - 16

M1 - e202218911

ER -

Mesogenic Groups Control the Emitter Orientation in Multi-Resonance TADF Emitter Films**

Abstract

Funding

Keywords

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