Abstract
Three green compounds for color filter dyes based on bis(cyclopentadienyl) titanium complexes including dithiolate ligand were synthesized. Physical properties by the change of the substitution groups of the synthesized materials were systematically examined. UV-visible absorption spectrum of the synthesized materials showed maximum absorbing wavelengths of 427 to 430 nm and 632 to 635 nm in solution state, and 434 to 438 nm and 637 to 651 nm in film state, indicating green and black colors. It was observed that the extinction coefficient values (log ε) of all the synthesized materials are very high at 4.0 or above. In addition, it was shown that since the Td values of three synthesized materials show thermal stability higher than 240°C, they possess high potential to be applied as dyes for LCD color filter and black matrix addictive.
Highlights
Thin-film transistor liquid crystal display (TFT LCD) panels have become increasingly important in the flat display panel industry [1]
A limited number of dyes and pigments for pure green color filters have been introduced because it is difficult to synthesize dye and pigment molecules which simultaneously absorb the light of both violet (600 nm) regions, but not that of around 500-nm region
We report a new class of green color filter materials of Cp2-Ti-dmit and its derivatives, consisting of a titanium (IV) metal, a dithiolate ligand, and different cyclopentadienyl ligands
Summary
Thin-film transistor liquid crystal display (TFT LCD) panels have become increasingly important in the flat display panel industry [1]. Among major parts in TFT LCD panels, red, green, and blue (RGB) color filters are a very essential component for rendering full color images in TFT LCD panels. Various types of dyes and pigments for RGB color filters have been extensively developed and commercially utilized in manufacturing color filters of TFT LCD panels. A wide range of blue and red color filter materials has been developed. A limited number of dyes and pigments for pure green color filters have been introduced because it is difficult to synthesize dye and pigment molecules which simultaneously absorb the light of both violet (600 nm) regions, but not that of around 500-nm region. In order to manufacture a color filter for large-sized TFT LCD panels, the ink-jet printing technology has been extensively used since it affords a facile and economic production process.
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