Secondary donor-acceptor group enable efficient pure green organic light-emitting devices based on multi-resonance TADF emitters

Song, Xiangan; Shen, Shaogang; Zou, Shengnan; Wang, Ying; Guo, Fengyun; Gao, Shiyong; Zhang, Yong

doi:10.1016/j.cej.2024.148794

Cited by 7 publications

(1 citation statement)

References 48 publications

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“…However, the spontaneous aggregation process of the conventional EFC materials often suffers from aggregation-caused quenching (ACQ), which limits their further practical applications. 15,16 Aggregation-induced emission (AIE) proposed by Tang in 2001 is a photophysical phenomenon associated with chromophore aggregation, which is a completely different luminescence phenomenon from ACQ. 17 Luminescent materials with AIE characteristics (AIEgen) exhibit strong emission in the aggregation state.…”

Section: Introductionmentioning

confidence: 99%

Redox regulation of electrofluorochromic behavior for an AIEgen-doped PVA hydrogel based on a ferrocene derivate

Zhang,

Li,

Liu

et al. 2024

New J. Chem.

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Section: Introductionmentioning

confidence: 99%

Redox regulation of electrofluorochromic behavior for an AIEgen-doped PVA hydrogel based on a ferrocene derivate

Zhang,

Li,

Liu

et al. 2024

New J. Chem.

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The Combination of a Donor–Acceptor TADF and a MR‐TADF Emitting Core Results in Outstanding Electroluminescence Performance

Chen,

Wang,

Sun

et al. 2024

Advanced Materials

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Here the utility and potential of an emitter design are demonstrated, consisting of a narrowband‐emitting multiresonant thermally activated delayed fluorescent (MR‐TADF) core that is decorated with a suitably higher energy donor‐acceptor TADF moiety. Not only does this D–A TADF group offer additional channels for triplet exciton harvesting and confers faster reverse intersystem crossing (RISC) kinetics but it also acts as a steric shield, insulating the emissive MR‐TADF core from aggregation‐caused quenching. Two emitters, DtCzBN‐CNBT1 and DtCzBN‐CNBT2, demonstrate enhanced photophysical properties leading to outstanding performance of the organic light‐emitting diodes (OLEDs). DtCzBN‐CNBT2, containing a D–A TADF moiety, has a faster kRISC (1.1 × 105 s−1) and higher photoluminescence quantum yield (ΦPL: 97%) compared to DtCzBN‐CNBT1 (0.2 × 105 s−1, ΦPL: 90%), which contains a D–A moiety that itself is not TADF. The sensitizer‐free OLEDs with DtCzBN‐CNBT2 achieve a record‐high maximum external quantum efficiency (EQEmax) of 40.2% and showed milder efficiency roll‐off (EQE1000 of 20.7%) compared to the DtCzBN‐CNBT1‐based devices (EQEmax of 37.1% and EQE1000 of 11.9%).

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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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Secondary donor-acceptor group enable efficient pure green organic light-emitting devices based on multi-resonance TADF emitters

Cited by 7 publications

References 48 publications

Redox regulation of electrofluorochromic behavior for an AIEgen-doped PVA hydrogel based on a ferrocene derivate

Redox regulation of electrofluorochromic behavior for an AIEgen-doped PVA hydrogel based on a ferrocene derivate

The Combination of a Donor–Acceptor TADF and a MR‐TADF Emitting Core Results in Outstanding Electroluminescence Performance

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

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