九州大学 エネルギー基盤技術国際教育研究センター

Energy Conversion Division -Hirotsugu KIKUCHI-

Photoelectric Conversion Technology

Professor

Hirotsugu KIKUCHI

Specialization

Organic material chemistry

Affiliation

Institute for Materials Chemistry and Engineering

Research Topics

  • Electro-optical materials using liquid crystals
  • Photonic liquid crystals
  • Display device materials
  • Research Outline

    We create new “soft matter” by equipping functionalized molecules such as liquid crystal and polymer molecules with unique order structures and organizational structures, and by fusing the original functions of the molecules with the functions brought about by their aggregate forms. We investigate the structures and the physical properties of those soft matters and apply them to materials that demonstrate advanced electronics and photonics functions. Liquid display devices with high-speed response and low energy consumption are being developed based on the polymer-stabilized blue phases.

Structural colors by chiral liquid crystal

Structural colors by chiral liquid crystal

Chiral liquid crystals show structural colors because of the helical structure of which pith length is comparable to visible wavelength. This property can be applied to display devices with low energy consumption.

Schematic illustration of blue phase structure

Schematic illustration of blue phase structure

Liquid crystal blue phases have cubic lattice structure and show fast electro-optical response.

Polarizing optical micrograph of liquid crystal blue phase

Polarizing optical micrograph of liquid crystal blue phase

Blue phases shows Bragg reflections in a visible range because they form giant cubic lattice comparable to visible wavelength in the lattice constant.