Two-Dimensional Graphene and MXene Electrodes for Stretchable Displays

<br/>Two-dimensional (2D) materials, exemplified by graphene and MXenes, hold immense potential for various flexible display applications. Nevertheless, the practical use of these materials has been hampered by the high charge injection barrier at the interface between stretchable electrodes and organic layers. In this study, we innovatively introduced a 2D graphene layer onto silver nanowire percolation networks, creating a comprehensive two-dimensional contact stretchable electrode (TCSE). This graphene layer effectively tailored the work function, facilitated charge distribution, and acted as a barrier against the ingress of oxygen and moisture. Our breakthrough enabled the development of intrinsically stretchable organic light-emitting diodes (ISOLEDs) boasting a remarkable efficiency of 20.3 cd/A. To further enhance electrode solution processability, we designed an environmentally stable MXene conductive electrode characterized by outstanding conductivity and a work function (WF) of 5.84 eV. Implementing the MXene electrode in ISOLEDs resulted in a substantial boost in current efficiency over 25 cd/A. These pivotal advancements not only establish a robust foundation but also offer a comprehensive blueprint for the creation of highly-efficient stretchable displays.<br/> <br/><b>Reference</b><br/><i>Adv. Mater.</i> 2022, 34, 2203040.<br/><i>Adv. Mater</i>. 2022, 34, 2206377.