Lim, Seok-In Jang, Eunji Yu, Dongmin Koo, Jahyeon Kang, Dong-Gue Lee, Kyung Min Godman, Nicholas P. P. McConney, Michael E. E. Kim, Dae-Yoon Jeong, Kwang-Un 2024-01-19T10:31:35Z 2024-01-19T10:31:35Z 2022-12-15 2023-01 0935-9648 https://pubs.kist.re.kr/handle/201004/114172 Light manipulation strategies of nature have fascinated humans for centuries. In particular, structural colors are of considerable interest due to their ability to control the interaction between light and matter. Here, wrinkled photonic crystal papers (PCPs) are fabricated to demonstrate the consistent reflection of colors regardless of viewing angles. The nanoscale molecular self-assembly of a cholesteric liquid crystal (CLC) with a microscale corrugated surface is combined. Fully polymerizable CLC paints are uniaxially coated onto a wrinkled interpenetrating polymer network (IPN) substrate. Photopolymerization of the helicoidal nanostructures results in a flexible and free-standing PCP. The facile method of fabricating the wrinkled PCPs provides a scalable route for the development of novel chirophotonic materials with precisely controlled helical pitch and curvature dimensions. The reflection notch position of the flat PCP shifts to a lower wavelength when the viewing angle increased, while the selective reflection wavelength of wrinkled PCP is remained consistent regardless of viewing angles. The optical reflection of the 1D stripe-wrinkled PCP is dependent on the wrinkle direction. PCPs with different corrugated directions can be patterned to reduce the angular-dependent optical reflection of wrinkles. Furthermore, 2D wavy-wrinkled PCP is successfully developed that exhibit directionally independent reflection of color. English WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim When Chirophotonic Film Meets Wrinkles: Viewing Angle Independent Corrugated Photonic Crystal Paper Article 10.1002/adma.202206764 1 Advanced Materials, v.35, no.1 Advanced Materials 35 1 N scie scopus 000891042800001 2-s2.0-85142801356 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article CHOLESTERIC LIQUID-CRYSTALS DIFFRACTION GRATINGS STRUCTURAL COLORS COLORATION REFLECTION EVOLUTION interpenetrating polymer networks photonic crystal papers wrinkle structures angle independence cholesteric liquid crystals