Transparent and conformable organic light-emitting diodes for skin-attachable invisible displays

• Published in: Materials today physics Vol. 36; p. 101157
• Main Authors: Xue, Chuang, Ni, Yanping, Zhao, Xiaoli, He, Ning, Li, Juntong, Yu, Hongyan, Zhang, Mingxin, Liu, Xiaoqian, Wang, Bin, Sun, Jing, Han, Xu, Zhang, Junru, Sun, Jingchun, Tong, Yanhong, Tang, Qingxin, Liu, Yichun
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.08.2023
• Subjects: Invisible display; Organic light-emitting diodes; Skin-attachable display; Wearable electronics; Skin-attachable display; Organic light-emitting diodes; Wearable electronics; Invisible display
• ISSN: 2542-5293; 2542-5293
• DOI: 10.1016/j.mtphys.2023.101157

A skin-attachable invisible display offers a new opportunity in next-generation electronic application, such as smart contact lenses, human-machine health monitoring interfaces and soft electronic skins. In response to this trend, transparent organic light-emitting diodes (OLEDs) offer enormous advantages in future skin-attachable invisible displays, including excellent flexibility and superior efficiency. Although several approaches reported recently attempt to manufacture transparent and flexible OLEDs, it is still a tremendous challenge to simultaneously meet the desired optical and mechanical properties. Herein, we develop a feasible strategy to achieve transparent and conformable OLEDs (TC-OLEDs). Benefiting from the intrinsic high transparency and outstanding deformability of our electrodes, the whole device shows high transmittance up to 85.0% at a wavelength of 400 nm and high mechanical flexibility with skin-like conformability. More strikingly, the resulting device maintains excellent photoelectric performance with a maximum current efficiency (CE) of 56.8 cd/A and external quantum efficiency (EQE) of 17.1%. Based on the versatile TC-OLEDs, we also report an all-organic and all-conformable invisible display driven by transparent and conformable organic thin film transistors (TC-OTFTs) for the first time. This work offers a meaningful guidance for the construction of TC-OLEDs and the development of skin-attachable invisible displays. Based on a novel strategy to achieve efficient, transparent and conformable OLEDs that enable seamless integration with human skin and further apply them to all-organic and all-conformable invisible display driven by transparent and conformable organic thin film transistors. This work offers a meaningful guidance for the construction of transparent and conformable OLEDs and the development of skin-attachable invisible displays. [Display omitted] •Achieving OLED with excellent transmittance and flexibility.•All-organic invisible display driven by OTFT is realized.