Synthesis and characterization of novel triazatetrabenzcorrole dyes for LCD color filter and black matrix

•Novel triazatetrabenzcorrole dyes were synthesized by ring-contraction reaction.•Red-shifted strong Soret band and blue-shifted Q-band appeared in absorption peaks.•Superior solubility was achieved by the introduction of bulky axial substituents.•Ideal transmittance spectrum was obtained without yellow compensating dye.•Successfully applied as colorants for both the LCD color filter and black matrix.

We have synthesized three novel triazatetrabenzcorrole dyes via a ring-contraction reaction to be applied as colorants for dye-based liquid crystal display color filter and black matrix. The absorption peaks of the synthesized dyes showed a red-shifted Soret band and a blue-shifted Q-band compared to phthalocyanine dyes, and this can be extremely beneficial when applied for liquid crystal display color filter and black matrix. These dyes exhibited enhanced solubility in the industrial solvents by the introduction of bulky axial substituents. The dyes were successfully spin-coated with binders on the substrate showing a lowered aggregating tendency as illustrated in the field emission scanning electron microscopy images. The spin-coated films prepared with these dyes exhibited superior optical and chromatic properties compared to the phthalocyanine-based or pigment-based ones for green color filter, even without the addition of a yellow compensating dye. In addition, they showed satisfactory dielectric properties for the black matrix of color filter on array mode.

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