2019
DOI: 10.1364/oe.27.004480
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Photo-responsive dye-doped liquid crystals for smart windows

Abstract: An electric field drives most dye-doped liquid crystal devices. Here, we demonstrate a new photo-responsive dye-doped self-organized cholesteric liquid crystal device. Upon UV or blue light exposure, the helical twisting power of the chiral azobenzene changes because of the trans-cis isomerization. As a result, the initially vertically aligned liquid crystal directors and dye molecules will change from transparent state to dark state. Such a polarizer-free photo-activated dimmer can be used for wide range of a… Show more

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Cited by 48 publications
(27 citation statements)
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“…Dye-doped LC have found numerous applications in smart window for light-tuning and privacy protection. A lot of related research have been carried out [1][2] [3]. In addition to the light absorption dye-doped LC, polymer-stabilized LC(PDLC) [4] and polymerdispersed LC(PSLC) [5] based on light-scattering effect have been developed.…”
Section: Introductionmentioning
confidence: 99%
“…Dye-doped LC have found numerous applications in smart window for light-tuning and privacy protection. A lot of related research have been carried out [1][2] [3]. In addition to the light absorption dye-doped LC, polymer-stabilized LC(PDLC) [4] and polymerdispersed LC(PSLC) [5] based on light-scattering effect have been developed.…”
Section: Introductionmentioning
confidence: 99%
“…As is well known, cholesteric LCs (CLCs) with self‐organized helical superstructures have received a great deal of attention owing to their unique optical property like selective light reflection and helical pitch sensitive to the impact of the external environment such as electric field, temperature, light, and so on. [ 12,13 ] Recently, our group has developed various of light‐responsive emissive CLCs by doping with chiral fluorescent photoswitches into the nematic LCs. [ 14 ] However, achieving a large‐scale fluorescence color switching in the photoresponsive emissive CLCs remains a challenge.…”
Section: Introductionmentioning
confidence: 99%
“…The advantage of a photo-controllable liquid crystal smart window is that it can automatically adjust transmittance from high to low upon exposure to UV, as in sunlight, and so self-adjust without extra energy input. The photo-controllable liquid crystal smart window requires additional photo-sensitive material (such as photosensitive chiral azobenzene [14,15], photochromic dye [16], or azo dye [17]). Most of the photo-controlled liquid crystal smart windows perform the sole function of either absorption or scattering.…”
Section: Introductionmentioning
confidence: 99%