Biomimetic Multicolored Polyfluorene Circularly Polarized Luminescence Micro‐Patterns towards Multilevel Encryption

Comprehensive Summary Circularly polarized luminescence (CPL) materials are attracting considerable attention due to their unique chiroptical properties and great potential in information encryption and smart sensing. However, arbitrary patterning of multicolor CPL materials with giant dissymmetry factor ( g lum > 1.5) in a scalable and customized way still remains challenging. Inspired by the cuticle of beetles, we present a general strategy for the fabrication of robust CPL films via twist‐stacking (TS) assembly of highly oriented polyfluorene (PF) films. We demonstrate strong CPL amplification via the continuous TS assembly of highly oriented PF films or the heterogeneous assembly with anisotropic poly(vinyl alcohol) (PVA) layer. Moreover, by mutually perpendicular stacking of two heterogeneous PF/PVA TS patterns, dual‐sided Janus displays, generating dynamic switchable CPL patterns on opposing surfaces, could be achieved. These hybrid films exclusively display decipherable information and tailorable CPL patterns under UV irradiation in darkness, while concealing all data in daylight. Thus, a multimodal information encryption system based on these biomimetic multicolored hybrid films can be devised through the programmed decryption process.