Dependence of the reflection spectrum of the polymer-stabilized cholesteric liquid crystal on the length of the diacrylate and monoacrylate reactive mesogen molecules

Abstract

We investigated the dependence of the reflection spectrum of the polymer-stabilized cholesteric liquid crystal (PSCLC) on the length of the diacrylate and the monoacrylate reactive mesogen (RM) molecules. The reflection bandwidth, the reflection center wavelength, and the peak reflectance of the PSCLC with a short diacrylate and a monoacrylate RM were similar to those of the pure cholesteric liquid crystal (CLC). When a longer diacrylate RM was used, the specular reflection bandwidth was broadened and the reflection center wavelength was shifted to the longer wavelength region. When a longer monoacrylate RM was used, a smaller specular reflectance and a greater diffusional reflectance from the top substrate were observed.

Bistable Cholesteric Liquid Crystal Films with Excellent Electro-Optical Performance and Spacing Stability for Reflective Displays

“…In the planar state, the sample’s transmittance at 560 nm decreased from 24.8% at 1% content to 11.1% at 5%. This is attributed to the fact that light scattering is enhanced due to the increased density of the polymer network, with a consequent declining transmittance . However, the transmittance of the focal cone state shows a trend of decreasing and then increasing and reaches a minimum value of 3.2% at an HDDA content of 3%.…”

“…This is attributed to the fact that light scattering is enhanced due to the increased density of the polymer network, with a consequent declining transmittance. 40 However, the transmittance of the focal cone state shows a trend of decreasing and then increasing and reaches a minimum value of 3.2% at an HDDA content of 3%. Therefore, it can be concluded that the CR of samples a1−a5 shows a trend of increasing and then decreasing according to the above definition of CR, as shown in Figure 3c.…”