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Ir(ppy)2(acac), OLED material with high quantum yields
Higher external quantum efficiency than Ir(ppy)3
Like Ir(ppy)3, bis[2-(2-pyridinyl-N)phenyl-C](acetylacetonato)iridium(III), or Ir(ppy)2(acac), is one of the most studied OLED materials due to its high quantum yields. When doped into 3,5-Diphenyl-4-(1-naphthyl)-1H-1,2,4-triazole (TAZ), very high external quantum efficiencies of (19.06 ± 1.0%) and luminous power efficiencies of 60±5 lm/W were achieved. This was attributed to the nearly 100% internal phosphorescence efficiency of Ir(ppy)2(acac), coupled with balanced hole and electron injection, and triplet exciton confinement within the light-emitting layer.
Ir(ppy)2(acac) demonstrated higher external quantum efficiency when compared with Ir(ppy)3. It was suggested that Ir(ppy)2(acac) molecules preferentially align so that their transition dipole moment is parallel to the substrate, whereas the orientation of Ir(ppy)3 molecules is nearly isotropic.
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Exciplex-Forming Co-host for Organic Light-Emitting Diodes with Ultimate Efficiency, Y-S. Park et al., Adv. Funct. Mater., 23, 4914–4920 (2013); DOI: 10.1002/adfm.201300547.
1,3,5-Triazine derivatives as new electron transport–type host materials for highly efficient green phosphorescent OLEDs,H-Fan Chen et al., J. Mater. Chem., 19, 8112–8118 (2009).
A white organic light-emitting diode with ultra-high color rendering index, high efficiency, and extremely low efficiency roll-off, N. Sun et al., Appl. Phys. Lett. 105, 013303 (2014); http://dx.doi.org/10.1063/1.4890217.
A multi-zoned white organic light-emitting diode with high CRI and low color temperature, T. Zhang et al., Sci. Reports, 6:20517; DOI: 10.1038/srep20517.
Achieving Above 60% External Quantum Efﬁ ciency in Organic Light-Emitting Devices Using ITO-Free Low-Index Transparent Electrode and Emitters with Preferential Horizontal Emitting Dipoles, C-Y. Lu et al., Adv. Funct. Mater. 2016; DOI: 10.1002/adfm.201505312.
High-Efficiency Green Phosphorescent Organic Light-Emitting Diode Based on Simplified Device Structures, M. Zhang et al., Chin. Phys. Lett., 32, 097803 (2015).
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