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Phenylimidazole-based Homoleptic Iridium(III) Compounds for Blue Phosphorescent Organic Light-emitting Diodes with High Efficiency and Long Lifetime
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- Authors
- Hyunsu Cho, Jonghee Lee, Jeong-Ik Lee, Nam Sung Cho, Jung Hwan Park, Jun Yeob Lee, Youngjin Kang
- Issue Date
- 2016-07
- Citation
- Organic Electronics, v.34, pp.91-96
- ISSN
- 1566-1199
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- Abstract
- In order to obtain triplet emitters with high stability and efficiency, three homoleptic iridium(III) compounds - specifically, Ir(tpim)3 (1), Ir(mtpim)3 (2), and Ir(itpim)3 (3), where tpim = 1-([1,1??:3??,1??-terphenyl]-2??-yl)-2-(4-fluorophenyl)-1H-imidazole, mtpim = 2-(4-fluorophenyl)-1-(5??-methyl-[1,1??:3??,1??-terphenyl]-2??-yl)-1H-imidazole, and itpim = 2-(4-fluorophenyl)-1-(5??-isopropyl-[1,1??:3??,1??-terphenyl]-2??-yl)-1H-imidazole - were prepared by one-pot reaction of the corresponding phenylimidazole ligand with an Ir(I) complex as a starting material. Compounds 1-3 emit bright sky-blue phosphorescence with {\\lambda}max = 459-463 nm and phosphorescent quantum efficiencies of 0.38-0.50. Multi-layer phosphorescent organic light-emitting diodes using compounds 1-3 as the triplet emitters and mCBP (3,3-di(9H-carbazol-9-yl)biphenyl) as the host have been fabricated. Compound 3 doped in the emissive layer demonstrate external quantum efficiency as high as 20.1% at 1000 cd/m2. In addition, the device based on compound 1 as an emitter shows a stable lifetime greater than 300 h at 1000 cd/m2, which is one of the best results concerning the device lifetime.
- KSP Keywords
- As 2, External Quantum Efficiency, High stability, Methyl-, Starting material, Triplet emitters, blue phosphorescence, blue phosphorescent organic light-emitting diodes, device lifetime, emissive layer(EL), high efficiency