Highly efficient non-doped orange-red phosphorescent organic light-emitting devices based on a novel iridium complex

Yige Qi; Xu Wang; Ming Li; Junsheng Yu; Zhiyun Lu

doi:10.1117/12.2069831

2 September 2014 Highly efficient non-doped orange-red phosphorescent organic light-emitting devices based on a novel iridium complex

Yige Qi, Xu Wang, Ming Li, Junsheng Yu, Zhiyun Lu

Author Affiliations +

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.

Citation Download Citation

Yige Qi, Xu Wang, Ming Li, Junsheng Yu, and 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); https://doi.org/10.1117/12.2069831

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