Multifunctional Iridium Complexes Based on Carbazole Modules as Highly Efficient Electrophosphors

Abstract

Getting the green light: Highly efficient organic light-emitting diodes (OLEDs) have been synthesized from robust green-electrophosphorescent IrIII complexes based on carbazole derivatives (see picture, HT=hole transporting, EL=electroluminescence). The combination of short triplet lifetime, high emission efficiency, and improved charge-transporting properties allows these OLEDs to achieve peak efficiencies of 12 % photons per electron and 38 cd A−1.