Photophysical properties of acid-responsive triphenylamine derivatives bearing pyridine fragments: Towards white light emission. (November 2017)

• Record Type: Journal Article
• Authors: Tydlitát, Jiří; Achelle, Sylvain; Rodríguez-López, Julián; Pytela, Oldřich; Mikýsek, Tomáš; Cabon, Nolwenn; Robin-le Guen, Françoise; Miklík, David; Růžičková, Zdeňka; Bureš, Filip
• Is Part Of: Dyes and pigments. Volume 146(2017)
• Page Start: 467
• Page End: 478
• Publication Date: 2017-11
• Subjects: Triphenylamine -- Pyridine -- Fluorescence -- White-light emission -- Protonation -- Intramolecular charge transfer; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2017.07.043
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: The synthesis, thermal, electrochemical, and optical properties of a series of triphenylamine derivatives bearing pyridine fragments and their trifluoroacetate salts are described. A dramatic increase in the intramolecular charge transfer is observed upon protonation, as evidenced by a significant reduction in the HOMO-LUMO gap and a red shift of both the absorption and the emission band. White photoluminescence was obtained in solution by the controlled protonation of blue emitting pyridine derivatives, which resulted in the yellow-orange emissive acidified form. In the solid state the emission color of doped polystyrene thin films could be tuned from steel blue to lawn green when the ratio of the protonated form was increased. These compounds have potential applications in the fabrication of multi-color OLEDs based on only one material. Graphical abstract: Highlights: Triphenylamines bearing pyridine(s) and their trifluoroacetate salts are described. Increase in the intramolecular charge transfer is observed upon protonation. White photoluminescence was obtained in solution by the controlled protonation.