Journal
OPTICAL MATERIALS EXPRESS
Volume 6, Issue 10, Pages 3145-3158Publisher
OPTICAL SOC AMER
DOI: 10.1364/OME.6.003145
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Funding
- National Natural Science Foundation of China [61107014, 51573036]
- Program for New Century Excellent Talents in University [NCET-12-0839]
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A new cyclic chiral azobenzene compound Azo-o-Bi was synthesized, which exhibits photochemically reversible cis-trans isomerization in both organic solvents and liquid crystal hosts. When doping into a nematic liquid crystal, it displays high helical twisting power (HTP, beta) and a large change in HTP (Delta beta) due to photoisomerization. Therefore, we are able to reversibly tune the reflection colors from near-IR to blue using irradiation with light. For weak UV light irradiation, a broadband reflection film with pitch gradients can be obtained with superior stability in the dark. This stability is associated with the cyclo-shape of the Azo-o-Bi and the high viscosity of the host liquid crystal. The latter reduces the diffusion contribution of isomers to a negligible level. The spatial and temporal control of the light irradiation can be used to photoaddress the CLC with RGB reflection colors and white-on-black reflective displays. (C) 2016 Optical Society of America
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