Synthesis of novel Ir complexes and their application in organic light emitting diodes

Three new substituted arylpyridine coordinated iridium complexes Ir(DPP)2(acac), Ir(BPP)2(acac) and Ir(FPP)2(acac) have been synthesized and used as emitter in OLED. The EL devices based on these complexes emitted in the green to yellow spectral range. The results showed that these complexes have strong phosphorescent characters. For the device based on Ir(FPP)2(acac), the maximum brightness reached 14180 cd m−2 and the maximum external efficiency reached 17.0 cd A−1.