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Oishi, Tomoji*; Kimura, Yu*; Nakajima, Kiyohiko*; Watanabe, Masayuki; Aoyagi, Noboru
Materials Sciences and Applications, 11(3), p.195 - 203, 2020/03
A high-efficiency synthesis method for a latent pigment of red pigment diketo-pyrrolo-pyrrole (Pig. Red 272:272DPP), which is important as a functional organic pigment, was investigated, and the investigation results revealed that irradiation of microwaves (MWs) for several seconds to 272 DPP in NMP (N-methyl-2-pyrrolidone) solvent yielded DPP latent pigment (272DPP-BOC) at a high yield of 86.2%. Two kinds of latent-pigment crystals, namely, red and yellow, were obtained by recrystallization, and it was found that the fluorescence-emission properties of the two kinds differ significantly. Single-crystal X-ray structural analysis showed that the difference in the fluorescence-emission properties of the two types is derived from the difference in their crystal structures.
Nakano, Masaki*; Oishi, Tomoji*; Watanabe, Masayuki; Aoyagi, Noboru
no journal, ,
In accordance with the development of display devices, study of the organic pigment for colour filter (CF) has become an active area of research. In this manner, the latent pigment has been drawn attention because of its both robustness and solubilization to organic solvent where latent pigment has blocking groups to avoid molecular aggregation in order to solubilize to organic solvent. This latent pigment returns to original pigment by heating treatment. These properties advantage in the usability of pigment to form films and the onset of robustness to utilize as pigment. In this study, derivatives of diketo pyrrolo pyrole (DPP) as a red CF pigment were synthesized efficiently by microwave and produce latent pigment and its film and investigated their luminescence properties.
Nakano, Masaki*; Oishi, Tomoji*; Watanabe, Masayuki; Aoyagi, Noboru
no journal, ,
no abstracts in English
Nakano, Masaki*; Oishi, Tomoji*; Watanabe, Masayuki; Aoyagi, Noboru
no journal, ,
In this study, we have focused on the development of the bright color filter(CF) by the solubilization of pigment. The diketo pyrrolo pyrole(DPP) derivatives are one of the most important CF pigment for LCD as a red pigment. The efficient synthesis of the latent by the microwave and the fluorescence properties of the pigments were investigated by using a variety of the substituent groups and the number of the substituents on the pigment.
