Van der Waals Multilayer Heterojunction for Low‐Voltage Organic RGB Area‐Emitting Transistor Array

• Published in: Advanced materials (Weinheim) Vol. 35; no. 8; pp. e2209097 - n/a
• Main Authors: Pan, Zhichao, Liu, Kai, Miao, Zhagen, Guo, Ankang, Wen, Wei, Liu, Guocai, Liu, Yanwei, Shi, Wenkang, Kuang, Junhua, Bian, Yangshuang, Qin, Mingcong, Zhu, Mingliang, Zhao, Zhiyuan, Guo, Yunlong, Dong, Huanli, Liu, Yunqi
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 01.02.2023
• Subjects: Arrays; Carrier recombination; Carrier transport; Density distribution; Dipoles; Display devices; Electric contacts; Electric potential; Emission; Excitons; Heterojunctions; low voltage; Materials science; multilayer heterojunctions; Multilayers; organic light‐emitting transistor arrays; Power consumption; Quantum efficiency; RGB area emission; Semiconductor devices; Transistors; van der Waals interaction; Voltage; organic light-emitting transistor arrays; low voltage; van der Waals interaction; multilayer heterojunctions; RGB area emission
• ISSN: 0935-9648; 1521-4095; 1521-4095
• DOI: 10.1002/adma.202209097

Organic light‐emitting transistors (OLETs) have garnered considerable attention from academy and industry due to their potential applications in next‐generation display technologies, multifunctional devices, and organic electrically pumped lasers. However, overcoming the trade‐offs among power consumption, external quantum efficiency (EQE), and uniform area emission remains a long‐standing issue for OLETs. Herein, a van der Waals multilayer heterojunction methodology is proposed to enhance the layer‐to‐layer interfacial interaction and contact, resulting in better dipole shielding, carrier transport, exciton recombination, and current density distribution. The prepared multilayer heterojunction OLET (MLH‐OLET) array shows uniform and bright RGB area emission and low operating voltage (<30 V among the lowest applied voltage of reported lateral LETs). Additionally, a high brightness under area emission of 1060 cd m−2, a high EQE value of 0.85%, and a high loop stability (over 380 cycles, outperforming state‐of‐the‐art OLETs) indicate that the proposed multilayer heterojunction is obviously superior to the reported lateral device configuration. The van der Waals multilayer heterojunction developed for the preparation of OLET arrays sufficiently meets the low‐voltage, high‐performance, and low‐cost requirements of future display technologies. A van der Waals multilayer heterojunction methodology is proposed to realize an organic light‐emitting transistor (OLET) array. The OLET array shows uniform RGB area emission and low operating voltage <30 V. Furthermore, a high brightness of under area emission 1060 cd m−2, a high EQE value of 0.85%, and good operational stability indicate that the multilayer heterojunction is significantly superior to contemporary device structures.