Turn-On Mode Circularly Polarized Luminescence in Self-Organized Cholesteric Superstructure for Active Photonic Applications

作者：Siyang Lin, Shuangshuang Zeng, Ziyuan Li, Qingyan Fan, Jinbao Guo · 发表于：ACS Applied Materials & Interfaces · 年份：2022 · DOI：10.1021/acsami.2c05678 · 被引用次数：75 · 研究领域：Photochromic and Fluorescence Chemistry、Synthesis and Properties of Aromatic Compounds、Photoreceptor and optogenetics research

Developing circularly polarized luminescence (CPL)-active materials with a large luminescence dissymmetry factor ( g lum ) or stimulus responses has evoked a lot of interest in the past few years; however, the light-controllable “on/off” CPL still remains a challenge. Here, a novel diarylethene-based chiral fluorescent photoswitch featuring “turn-on” CPL characteristic is developed, designated as ( S, S )-switch 6, which can undergo reversible photocyclization/cycloreversion upon irradiation with UV and visible light. ( S, S )-Switch 6 shows completely reversible “off–on–off”-responsive CPL behavior in solution. By doping ( S, S )-switch 6 into nematic liquid crystals (LCs), the consequent luminescent cholesteric LCs (CLCs) exhibit a larger g lum value enhanced 2 orders of magnitude when irradiated with UV light, which can be attributed to the highly ordered helical arrangement of CLCs. The potentials of this turn-on type CPL material for anticounterfeiting and information encryption are illustrated. Furthermore, the visualization of circularly polarized (CP) fluorescent patterns can be successfully achieved by constructing the double-layer CPL system consisting of a CP luminescent layer and a polymer cholesteric reflective layer. The proposed concept establishes a light-controlled off–on–off CPL platform that is of tremendous potential for applications in multi-informational data storage and encryption devices.