The dye's character

   Since ancient times, human beings have used natural dyes collected from plants and animals to enrich their colors. Moreover, when organic synthetic dyes were discovered in the 19th century, synthetic dyes became popular all over the world due to their sharpness and robustness, as well as their low price. For example, from natural dye indigo to synthetic dye Indico. Synthetic dyes have been developed and innovated according to their applications.

   "Functional pigments" have been advocated from Japan as a material that can utilize unique functionalities other than the original coloring properties of dyes. Today, along with the development of electronics, it is used in various industrial products such as display devices, energy, and light control materials. Further development is expected as a material that supports 

various electronics fields.

What are Functional Dyes?

   "Functional DyesIs a pigment that exerts a new function with a small amount of external energy (light, heat, electric field, pressure, etc.) in addition to the coloring property which is the original performance of the dye. MolecularπBy controlling the electron-conjugated system, it absorbs light in a specific wavelength range from the ultraviolet light range to the visible light and near-infrared light range (“light selective absorption”), and produces various colors in the visible light range. indicate . Some of these pigments have optical and electrochemical properties such as "photoconductivity, dichroism, fluorescence, sublimation, chromism, non-linear optical property, photoelectric conversion property" in addition to the original coloring property of the dye. 

Application introduction

   Visible Light Absorbing MaterialsIs used as a toning dye for the color filters built into LCDs. The transparency and sharp spectral characteristics unique to organic dyes accurately absorb the light from the backlight and show high color separation. This kind of performance contributes to improving the color reproducibility of the display.

  "Visible light absorbing materials" can be applied to optical recording materials, optical recording materials, organic solar cells, and organic electrochromic applications.

Infrared rays contained in sunlight raise the sensible temperature with long-wavelength invisible light.

   It is used as a window glass for cars and building materials, and is drawing attention as an energy-saving material.

  These materials that efficiently absorb light in the near infrared region can be applied to laser welding, anti-counterfeit inks, and various sensor applications in addition to various filter applications.

  "Photochromic DyesIs a pigment that responds to light and repeats coloring and decoloring. A functional lens that uses a photochromic dye is transparent indoors, but develops outdoors by the ultraviolet light contained in sunlight. Such functional lenses are used as sunglasses.

   In addition, it is expected to be applied to various applications such as light control materials and UV indicators that utilize the optical switch function.

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