A record-high EQE of 7.65%@3300 cd m<sup>−2</sup> achieved in non-doped near-ultraviolet OLEDs based on novel D′–D–A type bipolar fluorophores upon molecular configuration engineering

Qi, Haoyuan; Xie, Danyu; Gao, Zexuan; Wang, Shengnan; Peng, Ling; Liu, Yuchao; Ying, Shian; Ma, Dongge; Yan, Shouke

doi:10.1039/d4sc02655a

Chem. Sci.

2024

DOI: 10.1039/d4sc02655a

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A record-high EQE of 7.65%@3300 cd m⁻² achieved in non-doped near-ultraviolet OLEDs based on novel D′–D–A type bipolar fluorophores upon molecular configuration engineering

Haoyuan Qi,

Danyu Xie,

Zexuan Gao

et al.

Abstract: A non-doped mPPICNC3-based device, exhibiting CIE coordinates of (0.160, 0.032), achieves a record-breaking EQE of 7.67% and negligible efficiency roll-off up to 3300 cd m−2.

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Cited by 10 publications

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High‐Performance Solution‐Processable Organic Light‐Emitting Diode Based on a Narrowband Near‐Ultraviolet Emitter and a Hot Exciton Strategy

Jiang,

Chang,

Zhu

et al. 2024

Angewandte Chemie

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Achieving high efficiency narrowband near‐ultraviolet (NUV) emitters in organic light emitting diode (OLED) is still a formidable challenge. Herein, a proof‐of‐concept hybridized local and charge transfer (HLCT) molecule, named ICz‐BO, is prepared and characterized, in which both multiresonant (MR) skeletons are integrated via conjugation connection. A slightly distorted structure and weak intramolecular charge transfer (CT) interaction between two MR subunits lead to a high‐lying reverse intersystem crossing (h‐RISC) channel of T6→S1, also evidenced by both experimental and calculated results. Impressively, the ICz‐BO emitter exhibits outstanding narrowband NUV emission at 404 nm with a full‐width at half maximum of 28 nm in toluene solution. The solution processable OLED shows an excellent device performance with the recorded maximum external quantum efficiency of 12.01%, concomitant with an extremely low y‐axis Commission Internationale de l’Éclairage (CIEy) value of 0.031. To the best of our knowledge, this is the highest efficiency reported for the HLCT‐based NUV‐OLEDs to date. This research proves that the MR skeleton plays a positive effect on the narrowband hot exciton emitter, which provides an alternative paradigm for developing high‐efficiency NUV emitters.

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High‐Performance Solution‐Processable Organic Light‐Emitting Diode Based on a Narrowband Near‐Ultraviolet Emitter and a Hot Exciton Strategy

Jiang,

Chang,

Zhu

et al. 2024

Angewandte Chemie

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High‐Performance Solution‐Processable Organic Light‐Emitting Diode Based on a Narrowband Near‐Ultraviolet Emitter and a Hot Exciton Strategy

Jiang,

Chang,

Zhu

et al. 2024

Angew Chem Int Ed

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Efficient Deep‐Blue Fluorescent OLEDs Based on a D–π–A Emitter Profiting From Intramolecular Hydrogen Bonds and a Hybridized Excited State

Ji,

Ma,

Qiu

et al. 2024

Chemistry An Asian Journal

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High performance deep‐blue emitters with a Commission International de l'Eclairage (CIE) coordinate of CIEy≤0.08 are highly desired in ultrahigh‐definition displays. Herein, we designed and synthesized an efficient D–π–A deep‐blue emitter, 2‐(6‐([1,1′ : 3′,1′′‐terphenyl]‐5′‐yl)pyridin‐3‐yl)‐1‐phenyl‐1H‐phenanthro[9,10‐d] imidazole (mPTPH), using the synergistic effect of intramolecular hydrogen bond (H‐bond) and hybridized excited state. Single‐crystal structure analysis confirmed that there exist intra‐ and intermolecular H‐bond interactions which could inhibit the structure vibration and increase photoluminescence efficiency. The photophysical and theoretical results show that mPTPH exhibited hybridized local and charge‐transfer (HLCT) feature with strong deep‐blue emission. Ultimately, the non‐doped device based on mPTPH exhibited high maximum luminance of 20610 cd m−2. The doped device achieved high maximum external quantum efficiency of 5.4 % and small efficiency roll‐off with deep‐blue emission peak of 413 nm and CIE coordinate of (0.16, 0.08).

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A record-high EQE of 7.65%@3300 cd m⁻² achieved in non-doped near-ultraviolet OLEDs based on novel D′–D–A type bipolar fluorophores upon molecular configuration engineering

Abstract: A non-doped mPPICNC3-based device, exhibiting CIE coordinates of (0.160, 0.032), achieves a record-breaking EQE of 7.67% and negligible efficiency roll-off up to 3300 cd m−2.

Cited by 10 publications

References 73 publications

High‐Performance Solution‐Processable Organic Light‐Emitting Diode Based on a Narrowband Near‐Ultraviolet Emitter and a Hot Exciton Strategy

High‐Performance Solution‐Processable Organic Light‐Emitting Diode Based on a Narrowband Near‐Ultraviolet Emitter and a Hot Exciton Strategy

High‐Performance Solution‐Processable Organic Light‐Emitting Diode Based on a Narrowband Near‐Ultraviolet Emitter and a Hot Exciton Strategy

Efficient Deep‐Blue Fluorescent OLEDs Based on a D–π–A Emitter Profiting From Intramolecular Hydrogen Bonds and a Hybridized Excited State

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A record-high EQE of 7.65%@3300 cd m−2 achieved in non-doped near-ultraviolet OLEDs based on novel D′–D–A type bipolar fluorophores upon molecular configuration engineering

Abstract: A non-doped mPPICNC3-based device, exhibiting CIE coordinates of (0.160, 0.032), achieves a record-breaking EQE of 7.67% and negligible efficiency roll-off up to 3300 cd m−2.

Cited by 10 publications

References 73 publications

High‐Performance Solution‐Processable Organic Light‐Emitting Diode Based on a Narrowband Near‐Ultraviolet Emitter and a Hot Exciton Strategy

High‐Performance Solution‐Processable Organic Light‐Emitting Diode Based on a Narrowband Near‐Ultraviolet Emitter and a Hot Exciton Strategy

High‐Performance Solution‐Processable Organic Light‐Emitting Diode Based on a Narrowband Near‐Ultraviolet Emitter and a Hot Exciton Strategy

Efficient Deep‐Blue Fluorescent OLEDs Based on a D–π–A Emitter Profiting From Intramolecular Hydrogen Bonds and a Hybridized Excited State

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Product

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A record-high EQE of 7.65%@3300 cd m⁻² achieved in non-doped near-ultraviolet OLEDs based on novel D′–D–A type bipolar fluorophores upon molecular configuration engineering