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Hybridization of short-range and long-range charge transfer excited states in multiple resonance emitter

Multiple resonance (MR) thermally activated delayed fluorescence emitters have been actively studied as pure blue dopants for organic light-emitting diodes (OLEDs) because of excellent color purity and high efficiency. However, the reported MR emitter, 2,5,13,16-tetra-tert-butylindolo[3,2,1-jk]indol...

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Autores principales: Lee, Ha Lim, Kang, Jihoon, Lim, Junseop, Kim, Seung Chan, Jeon, Soon Ok, Lee, Jun Yeob
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10412604/
https://www.ncbi.nlm.nih.gov/pubmed/37558680
http://dx.doi.org/10.1038/s41467-023-40481-w
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author Lee, Ha Lim
Kang, Jihoon
Lim, Junseop
Kim, Seung Chan
Jeon, Soon Ok
Lee, Jun Yeob
author_facet Lee, Ha Lim
Kang, Jihoon
Lim, Junseop
Kim, Seung Chan
Jeon, Soon Ok
Lee, Jun Yeob
author_sort Lee, Ha Lim
collection PubMed
description Multiple resonance (MR) thermally activated delayed fluorescence emitters have been actively studied as pure blue dopants for organic light-emitting diodes (OLEDs) because of excellent color purity and high efficiency. However, the reported MR emitter, 2,5,13,16-tetra-tert-butylindolo[3,2,1-jk]indolo[1′,2′,3′:1,7]indolo[2,3-b]carbazole (tDIDCz) based on bis-fused indolocarbazole framework could not demonstrate efficient triplet-to-singlet spin crossover. In this work, we report two isomeric MR emitters designed to promote triplet exciton harvesting by reconstructing the electronic structure of tDIDCz. To manage excited states, strong electron donors were introduced at the 2,5-/1,6-position of tDIDCz. As a result, 2,5-positions managed tDIDCz shows long-range charge transfer characteristics while preserving the MR nature. Quantum chemical calculation demonstrates direct spin-orbit coupling by long-range charge transfer and spin-vibronic coupling assisted reverse intersystem crossing by short-range charge transfer simultaneously contribute to triplet-to-singlet spin crossover. Consequently, high performance blue OLED recorded a high external quantum efficiency of 30.8% at a color coordinate of (0.13, 0.13).
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spelling pubmed-104126042023-08-11 Hybridization of short-range and long-range charge transfer excited states in multiple resonance emitter Lee, Ha Lim Kang, Jihoon Lim, Junseop Kim, Seung Chan Jeon, Soon Ok Lee, Jun Yeob Nat Commun Article Multiple resonance (MR) thermally activated delayed fluorescence emitters have been actively studied as pure blue dopants for organic light-emitting diodes (OLEDs) because of excellent color purity and high efficiency. However, the reported MR emitter, 2,5,13,16-tetra-tert-butylindolo[3,2,1-jk]indolo[1′,2′,3′:1,7]indolo[2,3-b]carbazole (tDIDCz) based on bis-fused indolocarbazole framework could not demonstrate efficient triplet-to-singlet spin crossover. In this work, we report two isomeric MR emitters designed to promote triplet exciton harvesting by reconstructing the electronic structure of tDIDCz. To manage excited states, strong electron donors were introduced at the 2,5-/1,6-position of tDIDCz. As a result, 2,5-positions managed tDIDCz shows long-range charge transfer characteristics while preserving the MR nature. Quantum chemical calculation demonstrates direct spin-orbit coupling by long-range charge transfer and spin-vibronic coupling assisted reverse intersystem crossing by short-range charge transfer simultaneously contribute to triplet-to-singlet spin crossover. Consequently, high performance blue OLED recorded a high external quantum efficiency of 30.8% at a color coordinate of (0.13, 0.13). Nature Publishing Group UK 2023-08-09 /pmc/articles/PMC10412604/ /pubmed/37558680 http://dx.doi.org/10.1038/s41467-023-40481-w Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Lee, Ha Lim
Kang, Jihoon
Lim, Junseop
Kim, Seung Chan
Jeon, Soon Ok
Lee, Jun Yeob
Hybridization of short-range and long-range charge transfer excited states in multiple resonance emitter
title Hybridization of short-range and long-range charge transfer excited states in multiple resonance emitter
title_full Hybridization of short-range and long-range charge transfer excited states in multiple resonance emitter
title_fullStr Hybridization of short-range and long-range charge transfer excited states in multiple resonance emitter
title_full_unstemmed Hybridization of short-range and long-range charge transfer excited states in multiple resonance emitter
title_short Hybridization of short-range and long-range charge transfer excited states in multiple resonance emitter
title_sort hybridization of short-range and long-range charge transfer excited states in multiple resonance emitter
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10412604/
https://www.ncbi.nlm.nih.gov/pubmed/37558680
http://dx.doi.org/10.1038/s41467-023-40481-w
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