2013 Volume 86 Issue 6 Pages 190-197
Many functional dyes and pigments are widely applied in various displays, such as liquid crystal displays (LCD), plasma display panels,organic light emitting displays (OLED), optical data storage systems, digital printing systems, and dye-sensitized solar cells. In this outline of functional colorants, the functional dyes and pigments that are mainly used in displays and printing systems are illustrated. For example,organic pigments used for the color filter of LCD need to be present as fine particles to get high transparency and color ratio are taken from the high-performance pigments, such as diarylides, quinacridones and phthalocyanines, whereas dichromic dyes used in high-performance polarizing filters are taken from dis- or trisazo dyes. Some fluorescent dyes and cyclometalated iridium complexes are introduced as fluorescent and phosphorescent materials in OLED to give typical blue, green and red light sources.
In the field of ink-jet technology which is now widely used in all areas, some nano-pigments with a binder or a post-UV cured resin binder give much improved color space and brightness approaching dye-based inks. It is also explained that the color-formation and color-fading reactions in thermo-sensitive recording paper in which contains a fluoran leuco dye and an acidic compound with a long chain alkyl group are reversible.
