Bionic chiral superstructure fluorescent composite film as well as preparation method and application thereof

Abstract

The invention relates to a preparation method of a bionic chiral superstructure fluorescent composite film and a simple method for regulating circularly polarized luminescence. The method comprises the following steps: designing and preparing a bionic chiral superstructure aggregation-induced emission film; based on a selective transmission-reflection mechanism, the inclination angle of the film is changed to realize chiral inversion and asymmetry regulation and control of circular polarization luminescence; different AIEgens are selected to be added into a chiral polymer system, so that flexible regulation and control of a circularly polarized luminescence emission frequency band are realized; aIEgens is chemically grafted to a chiral matrix, the leading effect of a chiral superstructure on chiral regulation of a composite system is verified, and the application of a chiral polymer system in the field of circularly polarized luminescence regulation is further expanded. The preparation method of the bionic chiral superstructure fluorescent composite film is simple, the flexibility of the polymer film is maintained, the circularly polarized luminescence chirality can be synchronously regulated and controlled on a platform through simple film inclination, the applicability and the stability of a system in chiral optical application are ensured, and a practical method is provided for large-scale material production.

Description

technical field [0001] The invention belongs to the field of circularly polarized luminescence and its application in the field of luminescence regulation, and in particular relates to a method for realizing circularly polarized luminescence regulation by a bionic chiral superstructure fluorescent composite film. Background technique [0002] Circularly polarized luminescence (CPL), that is, the light-emitting system emits left-handed and right-handed circularly polarized light (L and R-CPL) with different proportions, has great potential in the fields of asymmetric catalysis, information storage and encryption, and optical displays, so Widespread concern. Chiral microenvironment and fluorescence emission are two essential conditions for the generation of CPL. To realize CPL, a general approach is to attach chiral molecules to π-conjugated molecules via covalent or non-covalent bonds, This type of molecule can form a helical structure, and the obtained material has the perf...

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Problems solved by technology

Inspired by this mechanism, researchers have developed several circularly polarized luminescent systems that break through molecular or first-order supramolecular chirality (e.g., twisted ribbons, helical fibers), however, the following problems still exist: (i) chirality The system mostly adopts a multi-layer structure, which requires precise design and complicated preparation process; (ii) when the achiral fluorophore is mixed into the chiral system to form a composite material, often only a single chiral system corresponding to the chiral system can be obtained. However, it is difficult to realize the simple and effective regulation of CPL, and obtain the conversion of different chiralities in a single material; (iii) due to the characteristics of aggregation-induced quenching of traditional fluorescent molecules, the luminous intensity of the obtained solid circularly polarized fluorescent materials is weak

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