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• W2900828867 abstract "This article reports new tris‐cyclometalated Ir III complexes containing mixed‐ C ^ N ligands, ( C ^ N 1 ) 2 Ir( C ^ N 2 ), which are a rarely explored class of complexes. Two mixed 2‐phenylpyridine (ppy)/4‐methyl‐2,5‐diphenylpyridine (mdp) complexes (ppy) 2 Ir(mdp) 3 and (ppy)Ir(mdp) 2 4 have been synthesized and their optoelectronic properties have been systematically characterized. Photoluminescence quantum yield values are 0.76–0.85; excited state lifetimes are 0.07–0.11 µs. Phosphorescent organic light emitting devices (PhOLEDs) based on these emissive complexes in a very simple device architecture reproducibly showed slightly higher external quantum efficiency (EQE) and power efficiency (PE) values compared with devices using the analogous conventional homoleptic Ir complexes Ir(ppy) 3 and Ir(mdp) 3 , and the heteroleptic complexes (ppy) 2 Ir(acac) and (mdp) 2 Ir(acac). The new complexes (ppy) 2 Ir(mdp) 3 and (ppy)Ir(mdp) 2 4 give PhOLEDs with EQE max and PE max values of 26.7 and 26.0 %/94.7 and 94.1 lm W –1 , respectively, and very high values are retained at the practical luminances of 100 and 1000 cd m –2 . The values for (ppy) 2 Ir(mdp) are 26.3 % and 73.6 lm W –1 (at 100 cd m –2 ) and 24.6 % and 53.5 lm W –1 (at 1000 cd m –2 ). These efficiencies are comparable with the highest reported values of PhOLEDs using conventional Ir III emitters in more complicated device structures. Mixed C ^ N ligand systems are, therefore, a viable strategy for developing new efficient phosphorescent emitters." @default.
• W2900828867 created "2018-11-29" @default.
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• W2900828867 date "2018-11-06" @default.
• W2900828867 modified "2023-09-26" @default.
• W2900828867 title "New Mixed‐ <i> C ^{^} N </i> Ligand Tris‐Cyclometalated Ir ^III Complexes for Highly‐Efficient Green Organic Light‐Emitting Diodes with Low Efficiency Roll‐Off" @default.
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• W2900828867 doi "https://doi.org/10.1002/ejic.201800550" @default.
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