Triphenylamine-functionalized rhenium (I) complex as a highly efficient yellow-green emitter in electrophosphorescent devices

A complex (3-ethyl-2-(4(')-triphenylamino)imidazo[4,5-f] 1,10-phenanthroline) Re(CO)(3)Br functionalized by a hole-transport group triphenylamine was used to fabricate organic light-emitting devices (OLEDs). A current efficiency up to 17.6 cd/A corresponding to a power efficiency of 9.2 ml/W and a peak brightness as high as 6500 cd/m(2) were obtained. These results represent the best values reported for OLEDs based on rhenium complexes. Enhanced carrier injection capability of Re complex and efficient charge-trapping formation followed by triplet exciton confinement in the emissive layer make for the outstanding electrophosphorescent performances. (c) 2006 American Institute of Physics.