Molecular design of highly effective thermally activated delayed fluorescence emitters based on ortho-substituted donor-acceptor-donor pyridinecarbonitrile derivatives and their application for high-performance OLEDs

Shin Hyung Choi; Chan Hee Lee; Chihaya Adachi; Sae Youn Lee

doi:10.1016/j.dyepig.2019.107775

Molecular design of highly effective thermally activated delayed fluorescence emitters based on ortho-substituted donor-acceptor-donor pyridinecarbonitrile derivatives and their application for high-performance OLEDs

Shin Hyung Choi, Chan Hee Lee, Chihaya Adachi, Sae Youn Lee

Applied Chemistry

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

6 Citations (Scopus)

Abstract

In this work, we designed and investigated two TADF molecules, AcCN and PxCN, introducing donor moieties into the 3,5-position of 4-pyridinecarbonitrile acceptor core. These D‒A‒D type compounds exhibit effective utilization of triplet excitons through a reverse intersystem crossing (RISC) process with relatively small singlet-triplet energy splitting (ΔE_ST) values less than 0.1 eV. With their high PL quantum yield (Φ_PL) and sufficient rate constant for RISC process (k_RISC), organic light-emitting diodes (OLEDs) employing AcCN and PxCN as emitters achieve a maximum external quantum efficiency (η_ext) of 20.6% and 15.5%, respectively, with green emissions.

Original language	English
Article number	107775
Journal	Dyes and Pigments
Volume	171
DOIs	https://doi.org/10.1016/j.dyepig.2019.107775
Publication status	Published - Dec 2019

All Science Journal Classification (ASJC) codes

Chemical Engineering(all)
Process Chemistry and Technology

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Molecular design of highly effective thermally activated delayed fluorescence emitters based on ortho-substituted donor-acceptor-donor pyridinecarbonitrile derivatives and their application for high-performance OLEDs. / Choi, Shin Hyung; Lee, Chan Hee; Adachi, Chihaya et al.
In: Dyes and Pigments, Vol. 171, 107775, 12.2019.

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

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title = "Molecular design of highly effective thermally activated delayed fluorescence emitters based on ortho-substituted donor-acceptor-donor pyridinecarbonitrile derivatives and their application for high-performance OLEDs",

abstract = "In this work, we designed and investigated two TADF molecules, AcCN and PxCN, introducing donor moieties into the 3,5-position of 4-pyridinecarbonitrile acceptor core. These D‒A‒D type compounds exhibit effective utilization of triplet excitons through a reverse intersystem crossing (RISC) process with relatively small singlet-triplet energy splitting (ΔEST) values less than 0.1 eV. With their high PL quantum yield (ΦPL) and sufficient rate constant for RISC process (kRISC), organic light-emitting diodes (OLEDs) employing AcCN and PxCN as emitters achieve a maximum external quantum efficiency (ηext) of 20.6% and 15.5%, respectively, with green emissions.",

author = "Choi, {Shin Hyung} and Lee, {Chan Hee} and Chihaya Adachi and Lee, {Sae Youn}",

note = "Funding Information: This work was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science & ICT & Future Planning (grant number: 2018R1C1B5044977 ) for S. Y. Lee and the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade & Industry & Energy (MOTIE) of the Republic of Korea (grant number: 20194030202320 ). C. Adachi acknowledges support from the Japan Science and Technology Agency (JST) , ERATO, the Adachi Molecular Exciton Engineering Project, under JST ERATO (grant number: JPMJER1305 ), Japan, and the International Institute for Carbon Neutral Energy Research ( WPI-I2CNER ) funded by the Ministry of Education, Culture, Sports, Science & Technology (MEXT) . We would like to express our appreciation to J. U. Kim for his technical assistance in measuring the photophysical properties and prof. Y. K. Han for helpful discussion about theoretical calculation on this research. Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

year = "2019",

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doi = "10.1016/j.dyepig.2019.107775",

language = "English",

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AU - Choi, Shin Hyung

AU - Lee, Chan Hee

AU - Adachi, Chihaya

AU - Lee, Sae Youn

N1 - Funding Information: This work was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science & ICT & Future Planning (grant number: 2018R1C1B5044977 ) for S. Y. Lee and the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade & Industry & Energy (MOTIE) of the Republic of Korea (grant number: 20194030202320 ). C. Adachi acknowledges support from the Japan Science and Technology Agency (JST) , ERATO, the Adachi Molecular Exciton Engineering Project, under JST ERATO (grant number: JPMJER1305 ), Japan, and the International Institute for Carbon Neutral Energy Research ( WPI-I2CNER ) funded by the Ministry of Education, Culture, Sports, Science & Technology (MEXT) . We would like to express our appreciation to J. U. Kim for his technical assistance in measuring the photophysical properties and prof. Y. K. Han for helpful discussion about theoretical calculation on this research. Publisher Copyright: © 2019 Elsevier Ltd

PY - 2019/12

Y1 - 2019/12

N2 - In this work, we designed and investigated two TADF molecules, AcCN and PxCN, introducing donor moieties into the 3,5-position of 4-pyridinecarbonitrile acceptor core. These D‒A‒D type compounds exhibit effective utilization of triplet excitons through a reverse intersystem crossing (RISC) process with relatively small singlet-triplet energy splitting (ΔEST) values less than 0.1 eV. With their high PL quantum yield (ΦPL) and sufficient rate constant for RISC process (kRISC), organic light-emitting diodes (OLEDs) employing AcCN and PxCN as emitters achieve a maximum external quantum efficiency (ηext) of 20.6% and 15.5%, respectively, with green emissions.

AB - In this work, we designed and investigated two TADF molecules, AcCN and PxCN, introducing donor moieties into the 3,5-position of 4-pyridinecarbonitrile acceptor core. These D‒A‒D type compounds exhibit effective utilization of triplet excitons through a reverse intersystem crossing (RISC) process with relatively small singlet-triplet energy splitting (ΔEST) values less than 0.1 eV. With their high PL quantum yield (ΦPL) and sufficient rate constant for RISC process (kRISC), organic light-emitting diodes (OLEDs) employing AcCN and PxCN as emitters achieve a maximum external quantum efficiency (ηext) of 20.6% and 15.5%, respectively, with green emissions.

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Molecular design of highly effective thermally activated delayed fluorescence emitters based on ortho-substituted donor-acceptor-donor pyridinecarbonitrile derivatives and their application for high-performance OLEDs

Abstract

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