Magnetic Assembly‐Assisted Photoprogrammable Circularly Polarized Luminescence Patterns in Flexible PDMS Films

Abstract Circularly polarized luminescence (CPL) material has been widely exploited in 3D display, information encryption, etc. However, in situ generation and dynamic modulation of CPL signals to achieve programmable CPL patterns remains challenging due to elusory interactions between fluorescence and the chiral microstructures. A novel strategy is proposed combining the controllable magnetic field‐assisted assembly and photo‐patterning technique to form the twisted stacking chiral heterostructure, consisting of orientated magnetic Ag@Fe 3 O 4 nanowires (NWs) and polydimethylsiloxane (PDMS) film embedded with achiral dyes and orientated polydiacetylene (PDA) chains. In a designed chiral system, the orientated PDA chains after in situ photo‐polymerization can serve as the polarizer to produce linear polarized fluorescence, while the aligned Ag@Fe 3 O 4 NWs on the surface of PDMS films act as phase retarder, favoring in situ CPL generation. Furthermore, the CPL characteristics, including the wavelength and handedness, can be switched by the thermo‐chromatic transition of PDA, thus, the programmable micropatterns with tailorable CPL distributions can be achieved. By employing the above fluorescence and CPL signals as two orthogonal information channels, the system possesses brilliant information storage capabilities, favoring multistage information encryption. This study proposes a novel strategy for the fabrication of programmable CPL micropatterns toward multiple information storage and encryption.