Preparation of Thermally Stable Red Dyes Derived from Diketo-Pyrrolo-Pyrrole Pigment for LCD Color Filter

Abstract

6 dyes derived from Diketo-pyrrolo-pyrrole pigment were prepared by introducing an N-alkyl group, an N-acyl group or an N-aryl group to the DPP-ring. Absorption maxima, thermal stability by a thermogravimetric analysis (TGA), and the chromatic characteristics of the fabricated films were measured. It was explained that the observed hypsochromic shift and the effects of N-substituent on thermal stability of the dyes as well as a chromaticity diagram.

Keywords:

• Diketo-pyrrolo-pyrrole (DPP)
• absorption maxima
• thermal stability
• N-acylation
• color filter
• chromaticity diagram

Acknowledgment

This research was supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, Republic of Korea.