Trifluoromethyl enable high-performance single-emitter white organic light-emitting devices based on quinazoline acceptor

Song, Xiangan; Shen, Shaogang; Lu, Mengyao; Wang, Ying; Zhang, Yong

doi:10.1016/j.cclet.2023.109118

Chinese Chemical Letters

2024

DOI: 10.1016/j.cclet.2023.109118

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Trifluoromethyl enable high-performance single-emitter white organic light-emitting devices based on quinazoline acceptor

Xiangan Song,

Shaogang Shen,

Mengyao Lu

et al.

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Cited by 3 publications

References 35 publications

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Dual Multiresonance Core Strategy Enable Efficient Pure Blue Organic Light‐Emitting Devices Based on Fluorene Linkages

Song,

Shen,

et al. 2024

Advanced Optical Materials

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Multiresonance thermally activated delayed fluorescence (MR‐TADF) emitters with high color purity in virtue of their inherent narrowband emission have received great interest in organic light‐emitting diodes (OLEDs). However, it remains a big challenge to develop the ultrapure blue MR‐TADF emitters with high efficiency. In this work, a novel “dual‐MR‐core” strategy is proposed by connecting two parent N‐B‐O‐skeletons with non‐conjugate 9‐position substituted fluorene linkages for high efficient deep‐blue MR‐TADF emitters, namely H‐FOBN and Me‐FOBN, which possess the highly twisted structure with suppressed aggregation. Finally, the vacuum‐deposited deep‐blue OLED exhibits excellent external quantum efficiency (EQE) of 25.1% with small full width at half maximum (FWHM) of 28 nm, as well as CIE of (0.14, 0.08). Furthermore, owing to enhanced solubility, the solution‐processed deep‐blue OLED based on Me‐FOBN shows EQE of 11.3%, with small FWHM of 32 nm and CIE of (0.14,0.09). These outstanding performances confirm that this “dual‐MR‐core” strategy provides a feasible approach to develop high efficient ultrapure blue MR‐TADF emitters.

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Dual Multiresonance Core Strategy Enable Efficient Pure Blue Organic Light‐Emitting Devices Based on Fluorene Linkages

Song,

Shen,

et al. 2024

Advanced Optical Materials

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Harvesting the tuning mechanism of strategic polychrome and white light emission in NapH dye based on excited state intermolecular proton transfer

Wang,

Sun,

et al. 2025

Journal of Molecular Structure

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Sulfone-Based HLCT Molecules with Efficient Orange and White Emission

Ai,

Shen,

Zhou

et al. 2024

ACS Appl. Electron. Mater.

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The hybrid local charge transfer (HLCT) state in the molecule opens up new avenues for achieving 100% exciton utilization by transforming high-energy triplet excitons into singlet excitons through reverse intersystem crossing. In this work, we designed and synthesized three D−A type HLCT materials without a π-bridge, PTZ-BTOBF, PXZ-BTOBF, as well as DMAC-BTOBF, using the BTOBF skeleton as the acceptor and phenothiazine (PTZ), phenoxazine (PXZ), and 9,9-dimethyl-9,10-dihydroacridine (DMAC) as donors. The molecules have HLCT excited-state characteristics, allowing for green to orange light emissions and exhibiting moderate PLQY. We fabricated a series of green to orange OLED devices and achieved the highest EQE of 4.99% and the lowest turnon voltage of 3.05 V. Furthermore, by adjusting the doping concentration, single-emitter WOLEDs have been successfully fabricated and achieved an EQE of 1.82% with CIE coordinates of (0.30, 0.35). The result demonstrates a decent WOLED constructed with an HLCT molecule, which may have potential for practical application.

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Trifluoromethyl enable high-performance single-emitter white organic light-emitting devices based on quinazoline acceptor

Cited by 3 publications

References 35 publications

Dual Multiresonance Core Strategy Enable Efficient Pure Blue Organic Light‐Emitting Devices Based on Fluorene Linkages

Dual Multiresonance Core Strategy Enable Efficient Pure Blue Organic Light‐Emitting Devices Based on Fluorene Linkages

Harvesting the tuning mechanism of strategic polychrome and white light emission in NapH dye based on excited state intermolecular proton transfer

Sulfone-Based HLCT Molecules with Efficient Orange and White Emission

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