Abstract
Organic dyes with low electrical conductivity have recently been suggested as replacements for Cr/CrOx and carbon black in developing black matrices with low dielectric constants for liquid crystal displays (LCDs). Two perylene diimide dyes with broad absorption spectra were synthesized, and dye-type, hybrid-type and carbon black-type black matrices were fabricated using one of the dyes. Donating groups were substituted on the bay positions of the dyes by C–N coupling to enhance their solubility in propylene glycol methyl ether acetate, one of the most widely used industrial solvents in the LCD manufacturing processes. The thermal and spectral properties of the dyes were studied by thermogravimetric analysis and UV–Visible spectroscopy. Furthermore, the thermal, optical and dielectric properties of the black matrices were examined by color spectroscopy, optical density measurement and impedance analysis. The hybrid-type black matrix showed promising results with a low dielectric constant, low transmittance spectrum and high thermal stability.
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