Benzonitrile/pyridylbenzoimidazole hybrid electron-transport material for efficient phosphorescence and TADF OLEDs

Jian Wang; Yeting Tao; Jingsheng Wang; Youtian Tao

doi:10.1016/j.matlet.2023.135624

Benzonitrile/pyridylbenzoimidazole hybrid electron-transport material for efficient phosphorescence and TADF OLEDs

Jian Wang, Yeting Tao, Jingsheng Wang, Youtian Tao

SCHOOL OF FLEXIBLE ELECTRONICS(FUTURE TECHNOLOGIES)|INSTITUTE OF ADVANCED MATERIALS(IAM)

Nanjing Tech University

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

3 Scopus citations

Abstract

A new electron-transport material (ETM) of iTPyBI-CN is developed through non-catalytic C-N coupling reaction from 2,4,6-trifluorobenzonitrile and 2-pyridyl-1H-benzo[d]imidazole. Compared to the commercial ETM of 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBI), the donor–acceptor type iTPyBI-CN exhibits a more twisted geometry for comparable triplet energy, higher LUMO and slightly deeper HOMO levels. In both phosphorescence and thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs), devices based on iTPyBI-CN as ETM demonstrates better electroluminescence (EL) efficiencies than TPBI, with maximum external quantum efficiency (EQE) of 20.2, 22.0, 16.3 and 16.1 % versus 16.4, 18.9, 11.0 and 3.0 % for various phosphorescent and TADF OLEDs.

Original language	English
Article number	135624
Journal	Materials Letters
Volume	356
DOIs	https://doi.org/10.1016/j.matlet.2023.135624
State	Published - 1 Feb 2024

Keywords

Electron-transport
Electronic materials
Luminescence
Organic light-emitting diodes
Phosphorescence
Thermally activated delayed fluorescence

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10.1016/j.matlet.2023.135624

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title = "Benzonitrile/pyridylbenzoimidazole hybrid electron-transport material for efficient phosphorescence and TADF OLEDs",

abstract = "A new electron-transport material (ETM) of iTPyBI-CN is developed through non-catalytic C-N coupling reaction from 2,4,6-trifluorobenzonitrile and 2-pyridyl-1H-benzo[d]imidazole. Compared to the commercial ETM of 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBI), the donor–acceptor type iTPyBI-CN exhibits a more twisted geometry for comparable triplet energy, higher LUMO and slightly deeper HOMO levels. In both phosphorescence and thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs), devices based on iTPyBI-CN as ETM demonstrates better electroluminescence (EL) efficiencies than TPBI, with maximum external quantum efficiency (EQE) of 20.2, 22.0, 16.3 and 16.1 % versus 16.4, 18.9, 11.0 and 3.0 % for various phosphorescent and TADF OLEDs.",

keywords = "Electron-transport, Electronic materials, Luminescence, Organic light-emitting diodes, Phosphorescence, Thermally activated delayed fluorescence",

author = "Jian Wang and Yeting Tao and Jingsheng Wang and Youtian Tao",

note = "Publisher Copyright: {\textcopyright} 2023 Elsevier B.V.",

year = "2024",

month = feb,

day = "1",

doi = "10.1016/j.matlet.2023.135624",

language = "英语",

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journal = "Materials Letters",

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TY - JOUR

T1 - Benzonitrile/pyridylbenzoimidazole hybrid electron-transport material for efficient phosphorescence and TADF OLEDs

AU - Wang, Jian

AU - Tao, Yeting

AU - Wang, Jingsheng

AU - Tao, Youtian

PY - 2024/2/1

Y1 - 2024/2/1

N2 - A new electron-transport material (ETM) of iTPyBI-CN is developed through non-catalytic C-N coupling reaction from 2,4,6-trifluorobenzonitrile and 2-pyridyl-1H-benzo[d]imidazole. Compared to the commercial ETM of 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBI), the donor–acceptor type iTPyBI-CN exhibits a more twisted geometry for comparable triplet energy, higher LUMO and slightly deeper HOMO levels. In both phosphorescence and thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs), devices based on iTPyBI-CN as ETM demonstrates better electroluminescence (EL) efficiencies than TPBI, with maximum external quantum efficiency (EQE) of 20.2, 22.0, 16.3 and 16.1 % versus 16.4, 18.9, 11.0 and 3.0 % for various phosphorescent and TADF OLEDs.

AB - A new electron-transport material (ETM) of iTPyBI-CN is developed through non-catalytic C-N coupling reaction from 2,4,6-trifluorobenzonitrile and 2-pyridyl-1H-benzo[d]imidazole. Compared to the commercial ETM of 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBI), the donor–acceptor type iTPyBI-CN exhibits a more twisted geometry for comparable triplet energy, higher LUMO and slightly deeper HOMO levels. In both phosphorescence and thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs), devices based on iTPyBI-CN as ETM demonstrates better electroluminescence (EL) efficiencies than TPBI, with maximum external quantum efficiency (EQE) of 20.2, 22.0, 16.3 and 16.1 % versus 16.4, 18.9, 11.0 and 3.0 % for various phosphorescent and TADF OLEDs.

KW - Electron-transport

KW - Electronic materials

KW - Luminescence

KW - Organic light-emitting diodes

KW - Phosphorescence

KW - Thermally activated delayed fluorescence

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U2 - 10.1016/j.matlet.2023.135624

DO - 10.1016/j.matlet.2023.135624

M3 - 文章

AN - SCOPUS:85178335939

SN - 0167-577X

VL - 356

JO - Materials Letters

JF - Materials Letters

M1 - 135624

ER -

Benzonitrile/pyridylbenzoimidazole hybrid electron-transport material for efficient phosphorescence and TADF OLEDs

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Keywords

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