Organic single‐crystal light‐emitting transistors with external quantum efficiency over 20%

作者：Jian Deng, Zejian Zhang, Pengpeng Sang, Shujun Yin, Shitong Zhang, Yuan Li, Bing Yang, Cheng Gu, Yuguang Ma · 发表于：Aggregate · 年份：2023 · DOI：10.1002/agt2.313 · 被引用次数：23 · 研究领域：Organic Electronics and Photovoltaics、Organic Light-Emitting Diodes Research、Luminescence and Fluorescent Materials

Abstract Organic light‐emitting transistors (OLETs) have attracted increasing attention because of their potential applications in next‐generation displays and high‐energy operating devices. However, the simultaneous achievement of high luminescent efficiency and carrier mobility in organic semiconductors remains challenging because the localized excitons are advantageous for light emission, whereas the delocalized carriers are beneficial for efficient charge migration. Herein, we report an organic single crystal of a cyano‐substituted styrene derivative with balanced mobility yielding a record‐high external quantum efficiency of 20.5% in OLETs. Temperature‐dependent I – V curves and electronic structure analyses based on first‐principles calculations were performed to disclose the underlying mechanism as a band transport, which provides an efficient way to achieve high quantum efficiency in OLETs.