Converting thermally activated delayed fluorescence into hybridized local and charge-transfer via an addition acceptor moiety

Zhao, Mintao; Wei, Qiang; Zhang, Jiasen; Li, Wei; Wang, Zhichuan; Du, Songyu; Xue, Qin; Xie, Guohua; Ge, Ziyi

doi:10.1016/j.orgel.2021.106365

Cited by 14 publications

(1 citation statement)

References 19 publications

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“…Organic light-emitting devices (OLEDs) have aroused widespread interest both in scientific research and industry area in recent three decades, [1][2][3][4] and a various of emitting materials with different mechanisms have been proposed to drive this area. Among these emitting materials, thermally activated delayed fluorescent DOI: 10.1002/macp.202200023 (TADF) materials have become a hot topic because of their special reverse intersystem crossing (RISC) process, [5][6][7] which can harvest triplet extensions to achieve 100% exciton utilization, [8][9][10][11] without the continent of noble metals.…”

Section: Introductionmentioning

confidence: 99%

Thermally Activated Delayed Fluorescent (TADF) Mono‐Polymeric OLED with Higher EQE over Its TADF Repeating Unit

Zhang

Wei

Lyu³

et al. 2022

Macro Chemistry & Physics

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Thermally activated delayed fuorescent (TADF) polymers are very suitable for fabricating highly efficient solution‐processed organic light emitting diodes (OLEDs). TADF homopolymers with simple structures are much preferred for preparation, but due to the triplet–triplet annnihilation, most TADF homopolymeric OLED exhibits lower external quantum efficiency (EQE) than its TADF repeating unit. Herein, two series small molecules (CzPhO and PxPhO) and their related mono‐polymers (PCzPhO and PPxPhO) are designed and synthesized for comparison. Among them, phenoxazine‐based materials show TADF properties compared to the carbazole‐based materials, which may be due to the enhanced electron donating ability of phenoxazine unit. In addition, the solution‐processed devices based on phenoxazine‐based polymer PPxPhO give excellent performance compared to their counterparts with the EQEmax of 11.8%.

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Section: Introductionmentioning

confidence: 99%

Thermally Activated Delayed Fluorescent (TADF) Mono‐Polymeric OLED with Higher EQE over Its TADF Repeating Unit

Zhang

Wei

Lyu³

et al. 2022

Macro Chemistry & Physics

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Purely Nitrogen‐Based Multi‐Resonance Deep‐Blue Emitter with an Ultralow y Color Coordinate of < 0.03 via Rationally Intramolecular Charge Transfer

Luo

et al. 2023

Advanced Optical Materials

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For purely nitrogen‐based multi‐resonance emitters (N‐MR), strategies to integrate emission modulation with high color purity remain exclusive, especially in near‐ultraviolet (NUV) regions. Herein, it is demonstrated for the first time that rationally introducing weak intramolecular charge transfer (ICT) to the MR skeleton to modulate the emission from violet to deep‐blue while retaining high color purity is feasible. By replacing the middle phenyl moiety with the pyridine or benzonitrile unit in the solely nitrogen‐based violet MR skeleton of tDIDCz, two proof‐of‐concept emitters, Nm‐ICz and CNm‐ICz, emphasizing mixed excited states of localized excited (LE) transition from the original MR skeleton and emergent transition channel with charge‐transfer (CT) character, successfully realize bathochromic‐shift and polarity‐insensitive fluorescence from 395 nm to 404–407 and 419–421 nm, respectively, while retaining small full‐width at half‐maximums (FWHMs) of 28–37 and 33–43 nm (214‐281 and 237–310 meV). Furthermore, Nm‐ICz shows bright and violet electroluminescence (EL) spectrum with the peak at 412 nm, while CNm‐ICz shows high color purity deep‐blue EL spectrum with the peak at 427 nm, a small FWHM of 42 nm (286 meV), an ultralow y color coordinate of 0.027, and a maximum external quantum efficiency (EQEmax) of 3.7%.

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Carbonyl‐ and Nitrogen‐Embedded Multi‐Resonance Emitter with Ultra‐Pure Green Emission and High Electroluminescence Efficiencies

Liang,

Qu,

Fan

et al. 2023

Angewandte Chemie

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Multi‐resonance thermally activated delayed fluorescence (MR‐TADF) emitters with narrow emission spectra have garnered significant attention in future organic light‐emitting diode (OLED) displays. However, current C=O/N‐embedded MR‐TADF systems still lack satisfactory performance in terms of electroluminescence bandwidths and external quantum efficiencies (EQEs). In this study, a C=O/N‐embedded green MR‐TADF emitter, featuring two acridone units incorporated in a sterically protected 11‐ring fused core skeleton, is successfully synthesized through finely controlling the reaction selectivity. The superior combination of multiple intramolecular fusion and steric wrapping strategies in the design of the emitter not only imparts an extremely narrow emission spectrum and a high fluorescence quantum yield to the emitter but also mitigates aggregation‐induced spectral broadening and fluorescence quenching. Therefore, the emitter exhibits leading green OLED performance among C=O/N‐based MR‐TADF systems, achieving an EQE of up to 37.2 %, a full width at half maximum of merely 0.11 eV (24 nm), and a Commission Internationale de l′Éclairage coordinate of (0.20, 0.73). This study marks a significant advance in the realization of ideal C=O/N‐based MR‐TADF emitters and holds profound implications for the design and synthesis of other MR‐TADF systems.

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Converting thermally activated delayed fluorescence into hybridized local and charge-transfer via an addition acceptor moiety

Cited by 14 publications

References 19 publications

Thermally Activated Delayed Fluorescent (TADF) Mono‐Polymeric OLED with Higher EQE over Its TADF Repeating Unit

Thermally Activated Delayed Fluorescent (TADF) Mono‐Polymeric OLED with Higher EQE over Its TADF Repeating Unit

Purely Nitrogen‐Based Multi‐Resonance Deep‐Blue Emitter with an Ultralow y Color Coordinate of < 0.03 via Rationally Intramolecular Charge Transfer

Carbonyl‐ and Nitrogen‐Embedded Multi‐Resonance Emitter with Ultra‐Pure Green Emission and High Electroluminescence Efficiencies

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