Exploring molecular design strategy for efficient luminescent materials is of high academic and industrial significance. In this work, it is demonstrated that the introduction of the functional group 4‐(phenoxazin‐10‐yl)benzoyl to the conventional chromophores of carbazole‐substituted fluorene derivatives can generate robust luminogens with aggregation‐induced delayed fluorescence (AIDF), and subtle molecular structure modulation can result in prodigious differences in photoluminescence (PL) and electroluminescence (EL). The obtained new AIDF materials exhibit high thermal and electrochemical stabilities, but their PL quantum yields and delayed fluorescence can be altered greatly. In consequence, these luminogens show varied EL performances in nondoped organic light‐emitting diodes (OLEDs) with external quantum efficiencies (η_ext) ranging from 19.0% to 3.3%. In doped OLEDs, these luminogens can afford higher η_ext values of 21.7−24.4% because of enhanced PL efficiencies and/or improved exciton recombination efficiencies. Noticeably, both nondoped OLEDs and doped OLEDs at high doping concentrations enjoy very small efficiency roll‐offs. These findings reveal that the proposed design strategy is feasible and applicable for constructing new AIDF luminogens for the fabrication of high‐performance OLEDs with greatly advanced efficiency stability.

中文翻译：

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鲁棒聚集诱导的延迟荧光发光剂的有效设计策略，可提高非掺杂和掺杂OLED的效率稳定性

探索高效发光材料的分子设计策略具有很高的学术和工业意义。在这项工作中，证明了将官能团4-（phenoxazin-10-yl）苯甲酰基引入到咔唑取代的芴衍生物的常规生色团中，可以产生具有聚集诱导的延迟荧光（AIDF）的强发光剂，并且微妙分子结构调节可导致光致发光（PL）和电致发光（EL）的巨大差异。所获得的新型AIDF材料具有较高的热稳定性和电化学稳定性，但是其PL量子产率和延迟荧光可以大大改变。结果，这些发光剂在具有外部量子效率（η）的非掺杂有机发光二极管（OLED）中显示出不同的EL性能。_ext）的范围从19.0％到3.3％。在掺杂的OLED中，这些luminogens可以承受更高的η _EXT因为增强的PL效率和/或改进的激子复合效率的21.7-24.4％的值。值得注意的是，未掺杂的OLED和高掺杂浓度的掺杂OLED的效率下降都很小。这些发现表明，所提出的设计策略是可行的，并适用于构建新型AIDF发光剂，以制造具有大大提高的效率稳定性的高性能OLED。