Defect is one of the key factors limiting optoelectronic performances of organic–inorganic hybrid systems. Although high-efficiency bidentate ligands based electroluminescent (EL) clusters reported, until present, only few EL clusters based on monodentate ligands are realized since their structural instability induces more surface/interface defects. Herein, this bottleneck is first overcome in virtue of interfacial passivation by electron transporting layers (ETL). Through using TmPyPB with meta-linked pyridines as ETL, photoluminescent (PL) and EL quantum efficiencies of the simplest monophosphine Cu₄I₄ cube [TPP]₄Cu₄I₄ are greatly improved by ≈2 and 23 folds, respectively, as well as ≈200 folds increased luminance, corresponding to a huge leap from nearly unlighted (<20 nits) to highly bright (>3000 nits). The passivation effect of TmPyPB on surface defects of cluster layer is embodied as preventing interfacial charge trapping and suppressing exciton nonradiation.

中文翻译：

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界面钝化极大增强了三苯基膦 Cu4I4 立方体的电致发光

缺陷是限制有机-无机杂化系统光电性能的关键因素之一。尽管已经报道了基于高效双齿配体的电致发光（EL）簇，但到目前为止，只有少数基于单齿配体的EL簇被实现，因为它们的结构不稳定性会导致更多的表面/界面缺陷。在这里，这个瓶颈首先通过电子传输层（ETL）的界面钝化来克服。通过使用具有间位连接吡啶的TmPyPB作为ETL，最简单的单膦Cu ₄ I ₄立方体[TPP] ₄ Cu ₄ I ₄的光致发光（PL）和EL量子效率也分别大大提高了约2倍和23倍亮度增加约 200 倍，相当于从几乎不亮（<20 尼特）到高亮（>3000 尼特）的巨大飞跃。TmPyPB对团簇层表面缺陷的钝化作用具体表现为防止界面电荷俘获和抑制激子非辐射。