Investigating blue phosphorescent iridium cyclometalated dopant with phenyl-imidazole ligands

- We evaluate blue PHOLED devices using Ir(iprpmi)3 as the emitting dopant.
- The charge recombination zone is controlled by varying the Ir(iprpmi)3 concentration.
- External quantum efficiencies (EQE) greater than 20% have been achieved.
- Devices with Ir(iprpmi)3 have improved lifetimes over those using the classic light-blue dopant FIrpic.