Highly Efficient Ultrathin Fluorescent OLEDs through Synergistic Sensitization Effects of Phosphor and Exciplex,ACS Applied Electronic Materials

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Highly Efficient Ultrathin Fluorescent OLEDs through Synergistic Sensitization Effects of Phosphor and Exciplex
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2020-11-09 , DOI: 10.1021/acsaelm.0c00734
Mingguang Li ₁ , Yizhong Dai ₁ , Ying Zhang ₁ , Jun Wang ₁ , Ye Tao ₁ , Chao Zheng ₁ , Runfeng Chen ₁ , Wei Huang ₁

Affiliation

Organic light-emitting diodes (OLEDs) with ultrathin emissive layers (EMLs) have attracted much attention recently due to their great potential in the solid-state lighting and flat panel display areas. Here, phosphorescent, fluorescent, and thermally activated delayed fluorescent (TADF) ultrathin OLEDs were developed and investigated to reveal their exact mechanisms in energy transfer for exciton sensitization. It was found that the formation of an interface exciplex is crucial for realizing high-performance ultrathin OLEDs, and the energy transfer from exciplexes to phosphorescent molecules is the most efficient among three kinds of electroluminescent devices. Moreover, the synergistic sensitization using both interface exciplex and phosphor can significantly improve the performance of ultrathin fluorescent OLEDs by the efficient Förster resonance energy transfer (FRET) through multiple channels from the exciplexes and/or phosphors to fluorescent molecules. By employing the phosphor-assisted interface exciplex sensitization strategy, the green ultrathin fluorescent OLEDs reach a high external quantum efficiency (EQE) of up to 8.1%, which is by far the first report on ultrathin fluorescent OLEDs with EQE exceeding 5%. These results demonstrate the fundamental advance of exciton manipulation in improving the device performance of ultrathin OLEDs with the newly proposed synergistic sensitization strategy, shedding light on the development of highly efficient ultrathin fluorescent devices.

中文翻译：

通过荧光粉和激基化合物的协同增感作用实现高效的超薄荧光OLED

具有超薄发光层（EML）的有机发光二极管（OLED）由于其在固态照明和平板显示领域中的巨大潜力，最近引起了人们的广泛关注。在这里，磷光，荧光和热激活延迟荧光（TADF）超薄OLED被开发和研究，以揭示它们在激子敏化的能量转移中的确切机制。已经发现，界面激基复合物的形成对于实现高性能超薄OLED至关重要，并且从激基复合物到磷光分子的能量转移在三种电致发光器件中是最有效的。此外，通过使用从激基复合物和/或磷光体到荧光分子的多个通道进行有效的福斯特共振能量转移（FRET），可以同时使用界面激基复合物和荧光粉进行协同增感，从而显着提高超薄荧光OLED的性能。通过采用荧光粉辅助的界面激基复合物敏化策略，绿色超薄荧光OLED可以达到高达8.1％的高外部量子效率（EQE），这是迄今为止关于EQE超过5％的超薄荧光OLED的首次报道。这些结果证明了激子操纵在利用新提出的协同敏化策略改善超薄OLED的器件性能方面的根本进展，为高效超薄荧光器件的发展提供了启示。

更新日期：2020-11-25

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