Environment / Energy Field
Near-infrared resonance photosensitive dyes
These dyes have an absorption maximum wavelength at the near-infrared rays range (from 700 nm to 2000 nm).
As dyes for near-infrared rays absorption, we can point out cyanine compound, phthalocyanine compound, dichiol metal complex, naphthoquinone compound, diimonium compound, azo compound and others.
As the application of these dyes, we can classify roughly into the thermal function (properties which convert light to thermal energy) and the optical function (properties which absorb light selectively).
As dyes utilizing the thermal function, we can point out photo-thermal agents for CTP and flash fusing toners. And as dyes utilizing the optical function, there are PDP near-infrared rays absorption cutting filters, heat rays shielding films and others.
Application examples of near-infrared resonance photosensitive dyes
Laser resin welding agents
Resin welding by laser is the fixation method to weld the contacted parts of the resin parts to be welded each other by laser rays.
Our laser rays absorbing colorant is excellent colorant, unlike to other conventional colorants, which we can confirm the laser welding by visual as it becomes colorless state after laser irradiation. So we can say that our colorant is extremely effective as resin laser welding agents.
Laser resin welding
Dyes for agricultural films
By applying thermal rays shielding films, we can absorb heat rays in solar rays and suppress increase in the temperatures of plants and vegetables, and the temperature of the land.
By shielding thermal rays at cultivation in summer, we can prevent the articulation disorder of the crop plants, improve the germination rate, prevent the turion seeding and reduce manpower by reducing the times of the irrigation. And also, we can expect the growth promotion and increase in the yield by improvement of the cultivation condition.
In the growth of plants, the photomorphogenesis reaction is influenced by plant hormones called phytochrome. In phytochrome, there are Pr type and Pfr type. By reducing light at around 660 nm, plants are influenced by the Pr type one and become taller. On the other hand, by reducing light at around 730 nm, plants are influenced by the Pfr type one and become dwarf.
By controlling these lights by dye filters, we can control the growth of plants.
To this dye filter, our YKR Series near-infrared resonance photosensitive dyes have been applying.
Dyes for illumination sensors
The wavelength sensitivity of the photo-sensitive element of semi-conductors, which is used at the light receiving section of illumination sensors has a peak at the infrared region having longer wavelength than visible rays. It detects near-infrared rays which can’t be detected by the human eyes and mistakenly judges it as bright. By applying dyes filters which cut near-infrared rays, we can expect the properties near the spectral sensitivity of the eye.
In this dyes filter, our YKR Series near-infrared resonance photosensitive dyes have been applying.
Dyes for flash fusing toners
The conventional image fixation system of electro-photographic system is the heat roll method. In that case, we can’t escape from decrease in the resolution accompanying with the image change caused by the thermal compression bonding or limitation of the kind of the subjects to be printed.
On the other hand, in case of the melting fixation so-called flash fusing toner welding, it is a non-contacting method by xenon lamp on near-infrared ray absorption materials as photo-thermal conversion agents. So we will not face such a problem. To near-infrared ray absorption agents, stability of the toner and high visible transmittance in consideration of the influence on the image hue are required.