Development of dimeric triarylmethine derivatives with improved thermal and photo stability for color filters. (September 2017) - Kong, Nam Sik
Abstract: Five novel triarymethine derivatives containing a two chromophore moiety within the molecule have been designed, synthesized and investigated as potential color filter dyes. These new "dimer-type" triarylmethines showed increased photostability and thermal stability compared to the Victoria Blue BO unit and notably manipulation of the dye counter ion also led to increased thermal stability. To evaluate the dyes in color filters, filters were fabricated and the photo- and thermo-stability was determined after heat treatment (230 °C for 30 min). The fabricated color filters showed approximately 80% transmittance at 450 nm and the ΔEab values were in the range 3.03–9.26. These results indicate that the synthesized dimer-type triarylmethine derivatives have the potential for application as color filters for blue dyes. Graphical abstract: Highlights: Five novel triarymethine derivatives have been designed, synthesized and investigated as potential color filter dyes. New designed "dimer-type" triarylmethines showed increased photo/thermal stability. Substitution such as methyl phenylene and naphthylene (Na-BTM) groups can control photo stability. Counter ion substituted with TFMS and DHFMS ions increased the thermal stability more than chloride.