Excitons play the central role in organic optoelectronic devices. Efficient exciton‐to‐photon and photon‐to‐electron conversion promote quantum yield in optoelectronic devices such as organic light‐emitting diodes and organic solar cells. Exciton‐related reaction products and defects in working devices have previously been viewed as fatal to stability. Here, the utilization of these excitonic reactions to create luminescent defects with extremely high (6.7%) external quantum efficiency in an operating device containing 1,1‐bis((di‐4‐tolylamino)phenyl) cyclohexane (TAPC) is reported. Transient photoluminescence reveals a long delayed fluorescence lifetime (2.7 µs) from these emissive defects, indicating that they exhibit thermally activated delayed fluorescence. It is shown that the functional group of tri‐p‐tolylamine (TPTA) follows similar processes as TAPC, suggesting that the chemical nature of the observed luminescent defects is directly related to TPTA.

中文翻译：

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工作有机发光二极管中的高发光缺陷的激子产生。

激子在有机光电器件中起着核心作用。有效的激子到光子和光子到电子的转换可提高光电器件（例如有机发光二极管和有机太阳能电池）的量子产率。激子相关的反应产物和工作装置中的缺陷以前被认为对稳定性具有致命性。在此，据报道，在包含1,1-双（（di-4-甲苯基氨基）苯基）环己烷（TAPC）的操作装置中，利用这些激子反应产生具有极高（6.7％）外部量子效率的发光缺陷。瞬态光致发光显示这些发射缺陷具有较长的延迟荧光寿命（2.7 µs），表明它们显示出热激活的延迟荧光。结果表明，三-官能团p甲苯胺（TPTA）遵循与TAPC类似的过程，这表明所观察到的发光缺陷的化学性质与TPTA直接相关。