Improved performance of electrophosphorescent devices based on Re(CO)3Cl‐dipyrido[3,2‐a:2′,3′‐c]phenazine

Abstract

Highly efficient orange-yellow organic electroluminescent (EL) devices based on Re(CO)3Cl‐dipyrido[3,2‐a:2′,3′‐c]phenazine (Re-DPPz) have been fabricated. By incorporating Re-DPPz into EL devices with balanced charge injection and efficient host-to-guest energy transfer, the EL performances were significantly improved comparing with previously reports based on the same complex. For EL device with 7wt% Re-DPPz doped emissive layer, turn-on voltage of 6V, maximum efficiency of 6.3cd∕A, and orange-yellow emission with brightness approaching 1000 cd∕m2 were achieved. The mechanism responsible for the significant improvement was discussed.