Synthesis and characterization of solubility enhanced metal-free phthalocyanines for liquid crystal display black matrix of low dielectric constant

Nine yellow azo dyes were designed and synthesised by using different diazo components and pyridonyl coupling components for application in dye-pigment hybrid colour filters for liquid crystal displays. The synthesised dyes were characterised by proton nuclear magnetic resonance and elemental analysis. The thermal stability was examined by thermogravimetric analysis, and solubility was estimated in industrial solvents such as N-methyl-2-pyrrolidone and propylene glycol methyl ether acetate. The dyes, which exhibited suitable physical properties for use in a dye-pigment hybrid colour filter, were fabricated into colour filters, and their optical properties were measured. Coloration Technology Society of Dyers and Colourists 158

Section: Resultsmentioning

confidence: 99%

Synthesis of yellow pyridonylazo colorants and their application in dye–pigment hybrid colour filters for liquid crystal display

Park

Jung

Wang

et al. 2016

“…Regardless of their compatibility with the binders used in coloured photoresists, quencher molecules should dissolve in concentrations of more than 5 wt% in organic solvents to produce the desired optical properties without aggregation [8][9][10]. Regardless of their compatibility with the binders used in coloured photoresists, quencher molecules should dissolve in concentrations of more than 5 wt% in organic solvents to produce the desired optical properties without aggregation [8][9][10].…”

Section: Quencher Solubilitymentioning

confidence: 99%

Synthesis of quenchers to control the fluorescence of Rhodamine B and improve the contrast ratio of blue filters for LCDs

Lee

Kwon²,

Oh³

et al. 2016

In this study, seven quenchers (derived from either anthraquinone, phthalimidylazo, or dipyrromethene chromophores) were prepared as candidates for additives to suppress fluorescence in blue colour filters and thus improve their contrast ratio. To reduce fluorescence effectively, quenchers must have typical properties such as spectral compatibility by which the absorbance spectrum of the quencher overlaps the fluorescence emission spectrum, exhibit high molar extinction coefficients, and exert little influence on the colour of the blue filter. The seven quenchers possessed absorption maxima of approximately 570-620 nm and reduced fluorescence (by more than 24%). Those quenchers tested in filter coatings increased their contrast ratios by about 50%. They thus effectively quenched fluorescence of the blue filter but without greatly affecting the chromaticity coordinates of the filters.

“…Regardless of their compatibility with binders, the solubility of dyes should be at least 5% w/w in industrial solvents for obtaining the desired optical properties [14][15][16]. Regardless of their compatibility with binders, the solubility of dyes should be at least 5% w/w in industrial solvents for obtaining the desired optical properties [14][15][16].…”

Section: Dye Solubilitymentioning

confidence: 99%

Preparation of thermally stable dyes derived from diketopyrrolopyrrole pigment by polymerisation with polyisocyanate binder

Yoon

Kwon

Yoo

et al. 2015

Four thermally stable and solvent soluble dyes were prepared from diketopyrrolopyrrole pigment via an Nalkylation reaction. To improve the thermal stability of the dyes, a hydroxyl functional group that could react with blocked polyisocyanates was introduced into the dyes. The prepared dyes had absorption maxima near 500 nm, and the chromaticity diagrams of all synthesised dyes exhibited smaller x and y values than those of CI Pigment Red 254, indicating that the colour of the synthesised dyes was close to an orange shade. The dyes reacting with blocked polyisocyanates showed extremely high thermal stability compared with analogous dyes not reacting with polyisocyanates.