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

Department of Energy and Materials Engineering

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

7 Scopus citations

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
State	Published - Dec 2019

Keywords

Organic light-emitting diodes (OLEDs)
Ortho-substitution
Pyridinecarbonitrile derivatives
Thermally activated delayed fluorescence (TADF)

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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.",

keywords = "Organic light-emitting diodes (OLEDs), Ortho-substitution, Pyridinecarbonitrile derivatives, Thermally activated delayed fluorescence (TADF)",

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

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

year = "2019",

month = dec,

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

language = "English",

volume = "171",

journal = "Dyes and Pigments",

issn = "0143-7208",

publisher = "Elsevier B.V.",

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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

TY - JOUR

T1 - 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

AU - Choi, Shin Hyung

AU - Lee, Chan Hee

AU - Adachi, Chihaya

AU - Lee, Sae Youn

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.

KW - Organic light-emitting diodes (OLEDs)

KW - Ortho-substitution

KW - Pyridinecarbonitrile derivatives

KW - Thermally activated delayed fluorescence (TADF)

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U2 - 10.1016/j.dyepig.2019.107775

DO - 10.1016/j.dyepig.2019.107775

M3 - Article

AN - SCOPUS:85070256351

SN - 0143-7208

VL - 171

JO - Dyes and Pigments

JF - Dyes and Pigments

M1 - 107775

ER -

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

Keywords

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