Abstract
In this study, we analyzed angular-selective absorption in a guest–host liquid crystal (GHLC) cell for its application in smart windows. For reducing the energy consumption, angular-selective absorption is desired because the light transmitted through windows during the daytime is predominantly incident obliquely from direct sunlight. Owing to the absorption anisotropy of guest dichroic dyes, a GHLC cell can absorb the obliquely incident light, while allowing people to see through windows in a normal view. Therefore, the cell can provide a comfortable environment for occupants, and reduce the energy required for cooling by blocking the solar heat incident from the oblique direction. The GHLC cell can be switched between the transparent and opaque states for a normal view. The rising (falling) time was 6.1 (80.5) ms when the applied voltage was 10 V.
Highlights
Switchable windows allow users to control the sunlight entering a building and the solar heat throughput while allowing people to see through them; in other words, their view is not blocked even when the window is darkened [1,2,3]
Over the past few decades, most studies on switchable windows have focused on chromic materials, such as electrochromic [10,11,12,13], photochromic [14,15,16], and thermochromic [17,18,19,20] materials, which change their color with external stimuli
We measured the transmittance of the fabricated guest–host liquid crystal (GHLC) cell switching to the aon-state, verticalofvoltage of applied
Summary
Switchable windows allow users to control the sunlight entering a building and the solar heat throughput while allowing people to see through them; in other words, their view is not blocked even when the window is darkened [1,2,3]. Unlike switchable windows, tinted windows absorb incident light from all directions, owing to their isotropic absorption properties Regardless of their viewing angle, people always see a dark view through them. Windows with chromic materials have been proposed to realize the angular selectivity of incident light [30,31] This requires complex multilayer structures because chromic devices absorb light from all directions with isotropic absorption properties. GHLCincell demonstrated that it selectively switched from the transparent to opaqueastates theand normal view by applying the voltabsorbs incident light by exhibiting angular dependence. It can be switched from age as required. The transparent to opaque states in the normal view by applying the voltage as required
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