Liu Junchao, Wang Yao, Wang Jingxia, Zhou Guofu, Ikeda Tomiki, Jiang Lei
Key Laboratory of Bio-inspired Materials and Interfaces Sciences, Technique Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China.
ACS Appl Mater Interfaces. 2021 Mar 17;13(10):12383-12392. doi: 10.1021/acsami.0c22668. Epub 2021 Mar 3.
Rewritable paper, as an environment-friendly approach of information transmission, has potential possibility to conserve energy and promote a sustainable development of our society. Recently, photonic crystals (PCs) have become a research hotspot in the development of rewritable paper. However, there are still many shortcomings that limit the further application of PC paper, such as slow response sensitivity, short-cycle lifetime, poor storage stability, and so on. Herein, we constructed an optically rewritable azobenzene inverse opals (AZOIOs) with a thin film ( 1 μm) plated on an inverse opal structure based on the UV/vis switchable structure color of the sample. The top thin film acts as a protective layer to avoid the large deformation of the pore structure and the bottom inverse opal structure with refractive index/pore structure change that provides reversible structure color. Large, reversible, and rapid bandgap shift ( 60 nm, 2 s) of AZOIOs can be repeated more than 100 times under alternating UV/vis irradiation based on isomerization of high content of the azobenzene group. On-demand long-time preservation pattern can be obtained by the appearance of azobenzene's intrinsic color. The proof of concept for rewritable PC paper is demonstrated herein. Such inkless rewritable colorful paper paves a way for developing novel display technology.
可重写纸作为一种环保的信息传输方式，具有节约能源和促进社会可持续发展的潜在可能性。近年来，光子晶体（PCs）已成为可重写纸发展中的一个研究热点。然而，仍存在许多缺点限制了PC纸的进一步应用，如响应灵敏度低、循环寿命短、存储稳定性差等。在此，我们基于样品的紫外/可见可切换结构颜色，构建了一种光学可重写的偶氮苯反蛋白石（AZOIOs），在反蛋白石结构上镀有一层薄膜（1μm）。顶部薄膜作为保护层，可避免孔结构的大变形，而底部具有折射率/孔结构变化的反蛋白石结构提供可逆的结构颜色。基于高含量偶氮苯基团的异构化，AZOIOs在交替紫外/可见光照射下可实现大于60nm、2s的大的、可逆的和快速的带隙移动，且可重复100多次。通过偶氮苯固有颜色的出现可实现按需长期保存图案。本文展示了可重写PC纸的概念验证。这种无墨可重写彩色纸为开发新型显示技术铺平了道路。
