2 September 2014 Highly efficient non-doped orange-red phosphorescent organic light-emitting devices based on a novel iridium complex
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Proceedings Volume 9284, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronics Materials and Devices for Sensing and Imaging; 928404 (2014) https://doi.org/10.1117/12.2069831
Event: 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2014), 2014, Harbin, China
Abstract
The non-doped orange-red phosphorescent organic light-emitting device (PHOLED) based on a newly synthesized iridium complex, bis[2-(biphenyl-4-yl)benzothiazole-N,C2']iridium(III)(acetylacetonate) [(4Phbt)2Ir(acac)] has been demonstrated. The non-doped device with (4Phbt)2Ir(acac) as the emissive layer achieved ideal turn-on voltage (<4 V) and superior power efficiency (5 lm/W) as well as luminance efficiency (6 cd/A), respectively. Our device performance indicates that (4Phbt)2Ir(acac) possesses excellent self-quenching-resistant property. The potential of this property is originated from the introduction of bulky and twisted aromatic substituents in ligands, which break the molecular planarity and obstruct the molecular packing. Besides, the high electroluminescence efficiency is also attributed to that the energy level alignment between (4Phbt)2Ir(acac) and adjacent charge-transporting materials forms a well-like structure, which confines exciton effectively in emissive layer.
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Yige Qi, Xu Wang, Ming Li, Junsheng Yu, Zhiyun Lu, "Highly efficient non-doped orange-red phosphorescent organic light-emitting devices based on a novel iridium complex", Proc. SPIE 9284, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronics Materials and Devices for Sensing and Imaging, 928404 (2 September 2014); doi: 10.1117/12.2069831; https://doi.org/10.1117/12.2069831
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