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Next gen television and computer screens: Creating optically active polymers

June 17, 2022
University of Tsukuba
A University of Tsukuba researcher describes a new method for obtaining conjugated polymers in a helical configuration. By using twisted liquid crystals as a template, the resulting polymers were found to be able to convert linearly polarized light into circularly polarized light. This work may be used for next-generation television and computer screens.

A scientist from the Faculty of Pure and Applied Sciences at the University of Tsukuba developed a method for producing electrically conductive polymers that assume a helical configuration. By using a liquid crystal as a template, he was able to produce optically active polymers that can convert light into a circular polarization. This approach may help lower the cost of smart displays.

Walking into an electronic store these days can be an overwhelming experience if you happen to wander into the television aisle. The sizes of TVs have significantly expanded in recent years, while the prices have dropped. This is mainly due to the adoption of organic light emitting devices (OLEDs), which are carbon-based polymers that can glow at tunable optical wavelengths. These conjugated polymers, which have alternating single and double bonds, are both electrically conductive, and have colors that can be controlled by chemical doping with other molecules. Their oxidation state can also be rapidly switched using an electric voltage, which affects their coloration. However, future advancement may require new materials that can take advantage of other kinds of optical properties, such as circular polarization.

Now, a researcher from the University of Tsukuba has introduced a technique for creating polymers locked into a helical configuration, using a sacrificial liquid crystal template. "Polymers that both have optical activity and luminescent function can emit circularly polarized light," author Professor Hiromasa Goto says. For this process, the liquid crystal molecules were originally in a straight configuration. The addition of monomer molecules caused the liquid crystals to twist into a helical configuration. This imprints a "chirality" or handedness to the structure, making it oriented either clockwise or counterclockwise. An electric voltage was applied, which triggered polymerization of the monomers. The liquid crystal template was then removed, leaving a polymer frozen in a helical shape. By breaking the mirror symmetry, the polymer has the ability to convert linearly polarized light into a circular polarization. The furan rings in the polymer not only contribute to the electrical conductivity, they also help stabilize the helical structure. "The pi-stacking interactions between the rings allows the polymer to aggregate into a highly ordered chiral system," Professor Goto says. The resulting polymer was tested using circular dichroism absorption spectroscopy and was found to have strong optical activity at visible wavelengths. Future applications of this process may include cheaper and more energy efficient electronic displays.

This work was supported by the Japan Society for the Promotion of Science (JSPS), Grants-in-Aid for Scientific Research (Magnetic Properties of Magneto-Optically Active Helical Polymers, No. 20K05626).

Story Source:

Materials provided by University of Tsukuba. Note: Content may be edited for style and length.

Journal Reference:

  1. Hiromasa Goto. Reaction field induction self-amplification optical activity during polymerization in liquid crystal. Molecular Crystals and Liquid Crystals, 2022; 1 DOI: 10.1080/15421406.2022.2073421

Cite This Page:

University of Tsukuba. "Next gen television and computer screens: Creating optically active polymers." ScienceDaily. ScienceDaily, 17 June 2022. <>.
University of Tsukuba. (2022, June 17). Next gen television and computer screens: Creating optically active polymers. ScienceDaily. Retrieved December 5, 2023 from
University of Tsukuba. "Next gen television and computer screens: Creating optically active polymers." ScienceDaily. (accessed December 5, 2023).

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