Fac-Tris(2-phenylpyridine)iridium (III)s, covalently surrounded by six bulky host dendrons, for a highly efficient solution-processed organic light emitting device

Abstract

The fully surrounded complexes by six host dendrons showed high photoluminescence quantum efficiency in a neat film, comparable to in a dilute solution. The surrounding host dendrons efficiently suppressed intermolecular interaction between central Ir complexes and prevented concentration quenching. The complex, (mCP) 6Ir , fully surrounded by six carbazole type hosts showed much better performance, compared with the complex, (DAP) 6Ir , surrounded by arylamine type hosts, because of well balanced charge injection and transporting in the devices.