A series of novel poly(carbazole-co-pyridine)s conjugated with copolymerized chelated Ir complexes in the main chain were synthesized by Suzuki polycondensation. Based on such copolymers, the electroluminescent devices were fabricated with configuration of ITO/PEDOT:PSS/polymer＋PBD (w＝30%)/ CsF/Al. The best device performances were achieved based on copolymer PCzPyIrMppy2, which showed the maximal quantum efficiency (QEext) and luminous efficiency (LE) of 4.1% and 6.1 cd/A, respectively, at current density (J) of 20.8 mA/cm2. Besides, the QEext and LE remained 3.2% and 4.8 cd/A, respectively, with peak emission at 570 nm and maximal luminance of 13251 cd/m2. This result indicated that incorporation of the phosphorescent complex into the conjugated polymer main chain was a new way to simultaneously realize high efficiency, long-term stability of phosphorescent polymer light-emitting diodes.

Key words: poly(carbazole-co-pyridine), Ir complex, orange light-emitting