Photonic crystal comprising photo-responsive molecules and method of preparing the same
AssigneeKorea Advanced Institute of Science and Technology
InventorsDong Ki Yoon, Wongi Park, Min Yong Yang
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Abstract
Disclosed are photonic crystals containing photoresponsive molecules and a method of preparing the same. More particularly, it is possible to synthesize photonic crystals containing photoresponsive molecules that induce photoalignment of azobenzene by ultraviolet irradiation using bent-shaped liquid crystal molecules containing azobenzene, which causes photo-isomerization upon ultraviolet irradiation, form a periodic structure in a visible light region using a self-assembly phenomenon occurring as temperature decreases, realize a reflection color and enable reversible pattering.
Claims8
A photonic crystal comprising a photoresponsive bent-shaped liquid crystal molecule in which two azobenzene groups are bonded via a linker interposed therebetween,
- wherein the photoresponsive bent-shaped liquid crystal molecule is represented by Chemical Formula 3 or Chemical Formula 4,
- wherein the photoresponsive bent-shaped liquid crystal molecule has a multilayer structure of a periodic 200 to 280 nm twisted layered structure in a visible light region, in order to realize a reflection color, and
- wherein the photonic crystal has a reflection wavelength close to green light of 550 nm from blue of 450 nm as a number of n in —(CH2)n—, wherein n is an odd number from 1 to 3, increases:
- wherein n is an odd number from 3 to 11,
- wherein X is F, Cl, Br or I and n is an odd number from 3 to 11.
Dependencies are inferred from the claim text.