Twisted Structure and Multiple Charge-Transfer Channels Endow Thermally Activated Delayed Fluorescence Devices with Small Efficiency Roll-Off and Low Concentration Dependence

Yuan Ye Zhu; Feng Ming Xie; Hao Ze Li; Kai Zhang; Han Yang Wang; Hao Nan Shi; Jianhua Zou; Yan Qing Li; Jian Xin Tang

doi:10.1002/asia.202400679

Twisted Structure and Multiple Charge-Transfer Channels Endow Thermally Activated Delayed Fluorescence Devices with Small Efficiency Roll-Off and Low Concentration Dependence

Yuan Ye Zhu, Feng Ming Xie^*, Hao Ze Li, Kai Zhang, Han Yang Wang, Hao Nan Shi, Jianhua Zou, Yan Qing Li^*, Jian Xin Tang^*

^*Corresponding author for this work

School of Physics and Electronic Science

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

Abstract

Despite the rapid development of thermally activated delayed fluorescent (TADF) materials, developing organic light-emitting diodes (OLEDs) with small efficiency roll-off remains a formidable challenge. Herein, we have designed a TADF molecule (mClSFO) based on the spiro fluorene skeleton. The highly twisted structure and multiple charge-transfer channels effectively suppress aggregation-caused quenching (ACQ) and endow mClSFO with excellent exciton dynamic properties to reduce efficiency roll-off. Fast radiative rate (k_r) and rapid reverse intersystem crossing (RISC) rate (k_RISC) of 1.6×10⁷ s⁻¹ and 1.07×10⁶ s⁻¹, respectively, are obtained in mClSFO. As a result, OLEDs based on mClSFO obtain impressive maximum external quantum efficiency (EQE_max) exceeding 20 % across a wide doping concentration range of 10–60 wt %. 30 wt % doped OLED exhibits an EQE_max of 23.1 % with a small efficiency roll-off, maintaining an EQE of 18.6 % at 1000 cd m⁻². The small efficiency roll-off and low concentration dependence observed in the TADF emitter underscore its significant potential.

Original language	English
Article number	e202400679
Journal	Chemistry - An Asian Journal
Volume	19
Issue number	21
DOIs	https://doi.org/10.1002/asia.202400679
State	Published - 4 Nov 2024

Keywords

concentration quenching resistance
low efficiency roll-off
multiple charge-transfer channels
organic light-emitting diodes
twisted structure

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Zhu, Y. Y., Xie, F. M., Li, H. Z., Zhang, K., Wang, H. Y., Shi, H. N., Zou, J., Li, Y. Q., & Tang, J. X. (2024). Twisted Structure and Multiple Charge-Transfer Channels Endow Thermally Activated Delayed Fluorescence Devices with Small Efficiency Roll-Off and Low Concentration Dependence. Chemistry - An Asian Journal, 19(21), Article e202400679. https://doi.org/10.1002/asia.202400679

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title = "Twisted Structure and Multiple Charge-Transfer Channels Endow Thermally Activated Delayed Fluorescence Devices with Small Efficiency Roll-Off and Low Concentration Dependence",

abstract = "Despite the rapid development of thermally activated delayed fluorescent (TADF) materials, developing organic light-emitting diodes (OLEDs) with small efficiency roll-off remains a formidable challenge. Herein, we have designed a TADF molecule (mClSFO) based on the spiro fluorene skeleton. The highly twisted structure and multiple charge-transfer channels effectively suppress aggregation-caused quenching (ACQ) and endow mClSFO with excellent exciton dynamic properties to reduce efficiency roll-off. Fast radiative rate (kr) and rapid reverse intersystem crossing (RISC) rate (kRISC) of 1.6×107 s−1 and 1.07×106 s−1, respectively, are obtained in mClSFO. As a result, OLEDs based on mClSFO obtain impressive maximum external quantum efficiency (EQEmax) exceeding 20 \% across a wide doping concentration range of 10–60 wt \%. 30 wt \% doped OLED exhibits an EQEmax of 23.1 \% with a small efficiency roll-off, maintaining an EQE of 18.6 \% at 1000 cd m−2. The small efficiency roll-off and low concentration dependence observed in the TADF emitter underscore its significant potential.",

keywords = "concentration quenching resistance, low efficiency roll-off, multiple charge-transfer channels, organic light-emitting diodes, twisted structure",

author = "Zhu, \{Yuan Ye\} and Xie, \{Feng Ming\} and Li, \{Hao Ze\} and Kai Zhang and Wang, \{Han Yang\} and Shi, \{Hao Nan\} and Jianhua Zou and Li, \{Yan Qing\} and Tang, \{Jian Xin\}",

note = "Publisher Copyright: {\textcopyright} 2024 Wiley-VCH GmbH.",

year = "2024",

month = nov,

day = "4",

doi = "10.1002/asia.202400679",

language = "英语",

volume = "19",

journal = "Chemistry - An Asian Journal",

issn = "1861-4728",

publisher = "John Wiley and Sons Ltd",

number = "21",

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TY - JOUR

T1 - Twisted Structure and Multiple Charge-Transfer Channels Endow Thermally Activated Delayed Fluorescence Devices with Small Efficiency Roll-Off and Low Concentration Dependence

AU - Zhu, Yuan Ye

AU - Xie, Feng Ming

AU - Li, Hao Ze

AU - Zhang, Kai

AU - Wang, Han Yang

AU - Shi, Hao Nan

AU - Zou, Jianhua

AU - Li, Yan Qing

AU - Tang, Jian Xin

PY - 2024/11/4

Y1 - 2024/11/4

N2 - Despite the rapid development of thermally activated delayed fluorescent (TADF) materials, developing organic light-emitting diodes (OLEDs) with small efficiency roll-off remains a formidable challenge. Herein, we have designed a TADF molecule (mClSFO) based on the spiro fluorene skeleton. The highly twisted structure and multiple charge-transfer channels effectively suppress aggregation-caused quenching (ACQ) and endow mClSFO with excellent exciton dynamic properties to reduce efficiency roll-off. Fast radiative rate (kr) and rapid reverse intersystem crossing (RISC) rate (kRISC) of 1.6×107 s−1 and 1.07×106 s−1, respectively, are obtained in mClSFO. As a result, OLEDs based on mClSFO obtain impressive maximum external quantum efficiency (EQEmax) exceeding 20 % across a wide doping concentration range of 10–60 wt %. 30 wt % doped OLED exhibits an EQEmax of 23.1 % with a small efficiency roll-off, maintaining an EQE of 18.6 % at 1000 cd m−2. The small efficiency roll-off and low concentration dependence observed in the TADF emitter underscore its significant potential.

AB - Despite the rapid development of thermally activated delayed fluorescent (TADF) materials, developing organic light-emitting diodes (OLEDs) with small efficiency roll-off remains a formidable challenge. Herein, we have designed a TADF molecule (mClSFO) based on the spiro fluorene skeleton. The highly twisted structure and multiple charge-transfer channels effectively suppress aggregation-caused quenching (ACQ) and endow mClSFO with excellent exciton dynamic properties to reduce efficiency roll-off. Fast radiative rate (kr) and rapid reverse intersystem crossing (RISC) rate (kRISC) of 1.6×107 s−1 and 1.07×106 s−1, respectively, are obtained in mClSFO. As a result, OLEDs based on mClSFO obtain impressive maximum external quantum efficiency (EQEmax) exceeding 20 % across a wide doping concentration range of 10–60 wt %. 30 wt % doped OLED exhibits an EQEmax of 23.1 % with a small efficiency roll-off, maintaining an EQE of 18.6 % at 1000 cd m−2. The small efficiency roll-off and low concentration dependence observed in the TADF emitter underscore its significant potential.

KW - concentration quenching resistance

KW - low efficiency roll-off

KW - multiple charge-transfer channels

KW - organic light-emitting diodes

KW - twisted structure

UR - https://www.scopus.com/pages/publications/85208448183

U2 - 10.1002/asia.202400679

DO - 10.1002/asia.202400679

M3 - 文章

C2 - 39073242

AN - SCOPUS:85208448183

SN - 1861-4728

VL - 19

JO - Chemistry - An Asian Journal

JF - Chemistry - An Asian Journal

IS - 21

M1 - e202400679

ER -

Twisted Structure and Multiple Charge-Transfer Channels Endow Thermally Activated Delayed Fluorescence Devices with Small Efficiency Roll-Off and Low Concentration Dependence

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