Luo Ziqing, Chen Wenfu, Lai Mengnan, Shi Shiyang, Chen Pengyu, Yang Xiaolong, Chen Zhan, Wang Ben, Zhang Yaokang, Zhou Xuechang
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518055, P. R. China.
Adv Mater. 2024 May;36(21):e2313909. doi: 10.1002/adma.202313909. Epub 2024 Feb 19.
Hufu, serving as evidence of imperial authorization in ancient China, comprises two parts in the form of tiger-shaped tallies that only become effective when matched. Drawing inspiration from the concept of Hufu, a reconfigurable electroluminescent (EL) device is designed by separating conventional integral devices into two parts that contain the EL layer (part A) and the transparent electrode (part B), respectively. The key to realizing such strategy is employing an adhesive and stretchable polymer gel composite as the transparent electrodes for the EL devices. The polymer gel composite facilitates robust yet reversible contact between the EL layer and transparent electrode, enabling high-performance and stretchable EL devices that can be readily disassembled and reassembled: the EL devices can maintain ≈81% of their initial luminance after 1000 times of repeated disassembly and reassembly. Moreover, the precursor ink of the polymer gel composite is compatible with a wide variety of coating and printing technologies, such as spin-coating, inkjet printing, dispensing, and brush painting. Importantly, the reconfigurable feature of the devices opens up a new path to encryption display systems, and as a proof-of-concept, EL encrypted password, and content-changeable digital clock are demonstrated.
虎符作为中国古代皇权授权的凭证，由两部分组成，呈虎形符节状，只有两者匹配时才生效。受虎符概念的启发，一种可重构电致发光（EL）器件被设计出来，它将传统的一体式器件分为两部分，分别包含EL层（A部分）和透明电极（B部分）。实现这种策略的关键是采用一种粘性且可拉伸的聚合物凝胶复合材料作为EL器件的透明电极。这种聚合物凝胶复合材料有助于EL层与透明电极之间形成牢固且可逆的接触，从而实现高性能且可拉伸的EL器件，这种器件可以很容易地拆卸和重新组装：在经过1000次重复拆卸和重新组装后，EL器件仍能保持其初始亮度的约81%。此外，聚合物凝胶复合材料的前驱体墨水与多种涂布和印刷技术兼容，如旋涂、喷墨印刷、点涂和刷涂。重要的是，器件的可重构特性为加密显示系统开辟了一条新途径，作为概念验证，展示了EL加密密码和内容可变的数字时钟。
