High Reflectance of Cholesteric Liquid Crystal Reflector by Double-Layer Structure

Abstract

Cholesteric liquid crystal (CLC) has a helical structure with either of left-handedness or right-handedness. Due to the helical structure, the selective reflection occurs depending on the chrial pitch. However, the reflectance of the CLC layer is theoretically limited to 50% because only one of right-or left-handed circularly polarized light is reflected. In this paper, we demonstrate high reflectance with double layer structure for the color reflector application.

A hyper-reflective cholesteric liquid crystal polymer network with double layers

“…37 To increase the reflectance, double-layered CLCN films constructed using left-and righthanded CLCN films were also prepared. [38][39][40] The reflectance of the film can reach 98%. Moreover, the hyper-reflective CLCN films can also be prepared using a half wave retarder.…”

Structural coloured epoxy resin patterns prepared using thermochromic epoxy liquid crystal mixtures

“…16 Polyacrylate CLCN films have been extensively studied since 1980s and 1990s, [17][18][19] and much attention has been paid to functionalities on them. [20][21][22][23][24][25][26][27][28][29] They are potentially applied in decoration, displays, and anti-counterfeiting. However, since oxygen can react with the initiator, primary and polymer radicals, the polymerization of acrylate monomers is usually inhibited by the formation of peroxyl radicals.…”

Colorful patterned polyacrylate films prepared using cholesteric liquid-crystalline mixtures with a smectic order

“…For broadening the Bragg reflection band, temperature [15], pressure [16], electric field [17,18], dyes [19], light intensity [20] and molecular structures of the LCs [21] were controlled. For increasing the reflectivity of light, the PSCLC films with both left-and right-handed supramolecular helical structures were prepared [29,30]. To enhance the elasticity, LC oligomers were selected as the starting materials [31][32][33].…”