Copolymers of carbazole- and indolocarbazole-containing phenylquinolines as new materials for electroluminescent devices

The photophysical and electrical properties of copolymers based on 2,6-polyphenylquinolines containing a bridging oxygen or phenylamine group between quinoline rings and octyl- or dodecylcarbazole or dioctylindolo[3,2-$b$]carbazole fragments in the aromatic radical are studied. It is shown that the introduction of carbazole and indolo[3,2-$b$]carbazole fragments emitting in the visible spectral range into the aromatic radical of a copolymer makes it possible to obtain white luminescence. The intensity of this luminescence exceeds, for copolymers in a photoinert matrix, that of the initial homopolymers. This circumstance, combined with rather high carrier mobilities on the order of 5 $\times$ 10$^{-6}$ cm$^2$ V$^{-1}$ s$^{-1}$, makes the copolymers promising for the development of electroluminescent devices on their basis.