Organic single‐crystal light‐emitting transistors with external quantum efficiency over 20%
Jian Deng,
Zejian Zhang,
Pengpeng Sang,
Shujun Yin,
Shitong Zhang,
Yuan Li,
Bing Yang,
Cheng Gu,
Yuguang Ma
Affiliations
Jian Deng
State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and Devices South China University of Technology Guangzhou P. R. China
Zejian Zhang
State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and Devices South China University of Technology Guangzhou P. R. China
Pengpeng Sang
School of Information Science and Engineering Shandong University Qingdao P. R. China
Shujun Yin
State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and Devices South China University of Technology Guangzhou P. R. China
Shitong Zhang
State Key Laboratory of Supramolecular Structure and Materials Institute of Theoretical Chemistry College of Chemistry Jilin University Changchun P. R. China
Yuan Li
School of Information Science and Engineering Shandong University Qingdao P. R. China
Bing Yang
State Key Laboratory of Supramolecular Structure and Materials Institute of Theoretical Chemistry College of Chemistry Jilin University Changchun P. R. China
Cheng Gu
State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and Devices South China University of Technology Guangzhou P. R. China
Yuguang Ma
State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and Devices South China University of Technology Guangzhou P. R. China
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.
