A Highly Twisted Carbazole-Fused DABNA Derivative as an Orange-Red TADF Emitter for OLEDs with Nearly 40 % EQE

Ying-Chun Cheng; Xiao-Chun Fan; Feng Huang; Xin Xiong; Jia Yu; Kai Wang; Chun-Sing Lee; Xiao-Hong Zhang

doi:10.1002/anie.202212575

A Highly Twisted Carbazole-Fused DABNA Derivative as an Orange-Red TADF Emitter for OLEDs with Nearly 40 % EQE

Ying-Chun Cheng
, Xiao-Chun Fan
, Feng Huang
, Xin Xiong
, Jia Yu
, Kai Wang^*
, Chun-Sing Lee^*
, Xiao-Hong Zhang^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

147 Citations (Scopus)

210 Downloads (CityUHK Scholars)

Abstract

Multiple resonance (MR) type thermally activated delayed fluorescence (TADF) material is currently a research hotspot in organic light-emitting diodes (OLEDs) due to their high color purity and high exciton utilization. However, there are only a handful of MR-TADF emitters with emissions beyond the blue-to-green region. The very limited emission colors for MR-TADF emitters are mainly caused by the fact that so far molecular modifications of MR-TADF do not offer much change in the emission colors. Here, we report a new approach to modifying a prototypical MR core of DABNA by fusing carbazoles to the MR framework. The carbazole-fused molecule (TCZ-F-DABNA) basically maintains the MR-dominated features of DABNA while red-shifting the emission. Its OLED achieves an external quantum efficiency of 39.2 % with a peak at 588 nm, which is a record-high efficiency for OLEDs with peaks beyond 560 nm. This work provides a new approach for significantly tunning emission colors of MR-TADF emitters.

Original language	English
Article number	e202212575
Journal	Angewandte Chemie - International Edition
Volume	61
Issue number	47
Online published	27 Sept 2022
DOIs	https://doi.org/10.1002/anie.202212575
Publication status	Published - 21 Nov 2022

Research Keywords

Carbazole Fusion
Concentration Quenching
Multiple Resonance
Organic Light-Emitting Diodes
Thermally Activated Delayed Fluorescence

Publisher's Copyright Statement

COPYRIGHT TERMS OF DEPOSITED POSTPRINT FILE: This is the peer reviewed version of the following article: Cheng, Y-C., Fan, X-C., Huang, F., Xiong, X., Yu, J., Wang, K., Lee, C-S., & Zhang, X-H. (2022). A Highly Twisted Carbazole-Fused DABNA Derivative as an Orange-Red TADF Emitter for OLEDs with Nearly 40 % EQE. Angewandte Chemie - International Edition, 61(47), Article e202212575, which has been published in final form at https://doi.org/10.1002/anie.202212575.
This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

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@article{a10c7ea5cece48d2b44142876f322ce2,

title = "A Highly Twisted Carbazole-Fused DABNA Derivative as an Orange-Red TADF Emitter for OLEDs with Nearly 40 \% EQE",

abstract = "Multiple resonance (MR) type thermally activated delayed fluorescence (TADF) material is currently a research hotspot in organic light-emitting diodes (OLEDs) due to their high color purity and high exciton utilization. However, there are only a handful of MR-TADF emitters with emissions beyond the blue-to-green region. The very limited emission colors for MR-TADF emitters are mainly caused by the fact that so far molecular modifications of MR-TADF do not offer much change in the emission colors. Here, we report a new approach to modifying a prototypical MR core of DABNA by fusing carbazoles to the MR framework. The carbazole-fused molecule (TCZ-F-DABNA) basically maintains the MR-dominated features of DABNA while red-shifting the emission. Its OLED achieves an external quantum efficiency of 39.2 \% with a peak at 588 nm, which is a record-high efficiency for OLEDs with peaks beyond 560 nm. This work provides a new approach for significantly tunning emission colors of MR-TADF emitters.",

keywords = "Carbazole Fusion, Concentration Quenching, Multiple Resonance, Organic Light-Emitting Diodes, Thermally Activated Delayed Fluorescence",

author = "Ying-Chun Cheng and Xiao-Chun Fan and Feng Huang and Xin Xiong and Jia Yu and Kai Wang and Chun-Sing Lee and Xiao-Hong Zhang",

year = "2022",

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day = "21",

doi = "10.1002/anie.202212575",

language = "English",

volume = "61",

journal = "Angewandte Chemie - International Edition",

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T1 - A Highly Twisted Carbazole-Fused DABNA Derivative as an Orange-Red TADF Emitter for OLEDs with Nearly 40 % EQE

AU - Cheng, Ying-Chun

AU - Fan, Xiao-Chun

AU - Huang, Feng

AU - Xiong, Xin

AU - Yu, Jia

AU - Wang, Kai

AU - Lee, Chun-Sing

AU - Zhang, Xiao-Hong

PY - 2022/11/21

Y1 - 2022/11/21

N2 - Multiple resonance (MR) type thermally activated delayed fluorescence (TADF) material is currently a research hotspot in organic light-emitting diodes (OLEDs) due to their high color purity and high exciton utilization. However, there are only a handful of MR-TADF emitters with emissions beyond the blue-to-green region. The very limited emission colors for MR-TADF emitters are mainly caused by the fact that so far molecular modifications of MR-TADF do not offer much change in the emission colors. Here, we report a new approach to modifying a prototypical MR core of DABNA by fusing carbazoles to the MR framework. The carbazole-fused molecule (TCZ-F-DABNA) basically maintains the MR-dominated features of DABNA while red-shifting the emission. Its OLED achieves an external quantum efficiency of 39.2 % with a peak at 588 nm, which is a record-high efficiency for OLEDs with peaks beyond 560 nm. This work provides a new approach for significantly tunning emission colors of MR-TADF emitters.

AB - Multiple resonance (MR) type thermally activated delayed fluorescence (TADF) material is currently a research hotspot in organic light-emitting diodes (OLEDs) due to their high color purity and high exciton utilization. However, there are only a handful of MR-TADF emitters with emissions beyond the blue-to-green region. The very limited emission colors for MR-TADF emitters are mainly caused by the fact that so far molecular modifications of MR-TADF do not offer much change in the emission colors. Here, we report a new approach to modifying a prototypical MR core of DABNA by fusing carbazoles to the MR framework. The carbazole-fused molecule (TCZ-F-DABNA) basically maintains the MR-dominated features of DABNA while red-shifting the emission. Its OLED achieves an external quantum efficiency of 39.2 % with a peak at 588 nm, which is a record-high efficiency for OLEDs with peaks beyond 560 nm. This work provides a new approach for significantly tunning emission colors of MR-TADF emitters.

KW - Carbazole Fusion

KW - Concentration Quenching

KW - Multiple Resonance

KW - Organic Light-Emitting Diodes

KW - Thermally Activated Delayed Fluorescence

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U2 - 10.1002/anie.202212575

DO - 10.1002/anie.202212575

M3 - RGC 21 - Publication in refereed journal

SN - 1433-7851

VL - 61

JO - Angewandte Chemie - International Edition

JF - Angewandte Chemie - International Edition

IS - 47

M1 - e202212575

ER -

A Highly Twisted Carbazole-Fused DABNA Derivative as an Orange-Red TADF Emitter for OLEDs with Nearly 40 % EQE

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