Recyclable soft photonic crystal film with overall improved circularly polarized luminescence

Abstract

Existing circularly polarized luminescence materials can hardly satisfy the requirements of both large luminescence dissymmetry factor and high luminescent quantum yield, which hinders their practical applications. Here, we present a soft photonic crystal film embedded with chiral nanopores that possesses excellent circularly polarized luminescence performance with a high luminescence dissymmetry factor as well as a large luminescent quantum yield when loaded with various luminescent dyes. Benefitting from the retention of chiral nanopores imprinted from a chiral liquid crystal arrangement, the chiral soft photonic crystal film can not only endow dyes with chiral properties, but also effectively avoid severe aggregation of guest dye molecules. More importantly, the soft photonic crystal film can be recycled many times by loading and eluting guest dye molecules while retaining good stability as well as circularly polarized luminescence performance, enabling various applications, including smart windows, multi-color circularly polarized luminescence and anticounterfeiting.

Circularly Polarized Luminescence of Cholesteric Liquid Crystal Polymer Networks with a Europium(III) Complex as an Emitter

“…That is, the CPL with the opposite handedness as the CP was passed, while the same-handed CPL was blocked. Such phenomena have also been reported in the literature . These observations matched the CPL result ( g lum = −0.60).…”

“…Such phenomena have also been reported in the literature. 58 These observations matched the CPL result (g lum = −0.60). Colorful patterns were also prepared with masks using 1.8 wt % of R5011 (Figure 7a−c), and the unpolymerized area was washed out with acetone.…”

Inverted and Amplified Circularly Polarized Luminescence Behavior Originated from Structure–Activity Regulation of Achiral Pyrene-Based Polymers in Chiral Coassemblies

“… , More interestingly, the fluorescence intensity of the ( S -D) 0.2 -(BP-2) 0.8 film showed obvious distinctions under the left-handed circular polarizer ( L -CP) and right-handed circular polarizer ( R -CP) (Figure S8). This is because ( S -D) 0.2 -(BP-2) 0.8 can emit a strong signal of left-handed circularly polarized light, facilitating its passage through a L -CP . Furthermore, atomic force microscopy was used to determine the film-forming properties of ( S / R -D) 0.1 -(BP-1) 0.9 and ( S / R -D) 0.2 -(BP-2) 0.8 .…”

“…This is because (S-D) 0.2 -(BP-2) 0.8 can emit a strong signal of left-handed circularly polarized light, facilitating its passage through a L-CP. 58 Furthermore, atomic force microscopy was used to determine the filmforming properties of (S/R-D) 0.1 -(BP-1) 0.9 and (S/R-D) 0.2 -(BP-2) 0.8 . As shown in Figure S9, (S-D) 0.2 -(BP-2) 0.8 displays a smoother morphology and has a smaller root-mean-square (RMS) roughness value (RMS = 0.426 nm) than that of (S-D) 0.1 -(BP-2) 0.9 (RMS = 0.528 nm), demonstrating that the chiral S-D can be well-coassembled with the achiral BP-2 emitter.…”

Amplified Circularly Polarized Luminescence Behavior in Chiral Co-assembled Liquid Crystal Polymer Films via the Strategic Manipulation of Chiral Inducers

“…Chiral emission liquid crystals (N*-LCs) are regarded as a typical chiral supramolecular system that they can assemble themselves to form a highly regular and ordered helical arrangement in a liquid crystal medium. − This is very advantageous for the enlargement of the induced CPL signal through a strong intermolecular stacking interaction or under an annealing treatment. In particular, liquid crystal polymers (LCPs) have the advantages of chiral transfer induction and CPL emission response enhancement, and their anisotropy and self-assembly capabilities have broad prospects for increasing the g em values of CPL materials. − In general, the methods to obtain chiral LCPs include doping with foreign liquid crystal polymers (F8BT) or the construction of their own liquid crystal polymers. , For instance, Akagi’s team provides a strategy for adding chiral nematic liquid crystals as elementary molecules to conjugated polymers to generate strong CPL signals. , Recently, Cheng’s group has successfully developed a chiral co-assembly using a flexible main chain achiral pyrene (Py)-based liquid crystal polymer and a rigid binaphthyl chiral inducer via intermolecular π–π stacking . This innovative strategy not only amplifies the CPL signal but also adjusts the direction of the CPL emission.…”