© WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
September 07, 2010
Functional Polymers: Liquid crystalline polymers with tunable photoluminescence color and polarized light emission
Nobuhiro Kawatsuki,* Ryoichi Ando, Ryosuke Ishida, Mizuho Kondo, and Yuta Minami
N. Kawatsuki et al. present their results on tunable photoluminescent color and polarized light emission of fluorene derivatives reversibly embedded into a liquid crystalline polymer. The fluorene derivatives possess terminal pyridine rings and are able to form H-bonds to the side-on attached cinnamic acid moieties of the polymer thus varying the photoluminescence properties. Additionally, cinnamic acid changes its acidity when undergoing a [2 + 2] photo crosslinking reaction; hence the acidity of the material can be controlled via the degree of photoreaction. As the λmax of the photoluminescence depends on the extent of formed H-bonds correlating to the acidity of the material it can be tuned by the position of the N-atom in the pyridine as well as the degree of photoreaction of the cinnamic acid. The polymer bearing cinnamic acid side-groups can be employed as a photoalignment layer to obtain oriented materials possessing anisotropic photoluminescence. This behavior paves the way for applications in backlighting LC displays or polarized luminescent devices.
Macromol. Chem. Phys., DOI: 10.1002/macp.201000183
Other contributions to the special series on functional polymers can be found here.