Applied Physics Letters · 2003 · 611 citations · 10 references
Natural SciencesChemistryMaterials ScienceOptical MaterialsOrganic ChemistryPhotonicsLight-emitting DiodesLuminescent MaterialsOptoelectronic MaterialsOrganic Electronic MaterialsOrganic SemiconductorsCurrent EfficiencyExternal Quantum EfficiencyLight-emitting DevicesMaximum Power OutputOrganic ElectronicsPower EfficiencyQuantum EfficiencyTriplet States
We have significantly improved the emission efficiency in an organic light-emitting device (OLED) based on iridium (III)bis[(4,6-di-fluoropheny)-pyridinato-N,C2′]picolinate (FIrpic). To improve the efficiency, 4,4′-bis(9-carbazolyl)-2,2′-dimethyl-biphenyl, which has a high triplet energy, was used as the carrier-transporting host for the emissive layer. The FIrpic-based OLED exhibited a maximum external quantum efficiency of 10.4%, corresponding to a current efficiency of 20.4 cd/A, and a maximum power efficiency of 10.5 lm/W. The efficiency was drastically improved compared to that of a previously reported FIrpic-based OLED. This result indicates that triplet energy is efficiently confined on FIrpic molecules, resulting in the high efficiency.
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Highly efficient phosphorescent emission from organic electroluminescent devices
Marc A. Baldo, D. F. O’Brien, Yujian You et al. · Nature · 1998 · 7.2K citations