Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1443072 | Synthetic Metals | 2009 | 5 Pages |
Abstract
We have synthesized a new solution processable iridium complex, di[2-(4â²-octyloxyphenyl) benzothiazole]iridium(III)acetoacetone, [(OPBT)2Ir(acac)], based on benzothiazole derivative for organic electro-phosphorescent devices. The synthesized molecule was identified by 1H NMR and 13C NMR, and readily soluble in common organic solvents such as chlorobenzene. The UV-visible absorption and photoluminescence properties of pristine [(OPBT)2Ir(acac) thin film as well as poly(N-vinylcarbzole) (PVK) thin film doped with the iridium complex were studied. The maximum UV-visible absorption and photoluminescence (PL) spectra are found to be at 337Â nm and 547Â nm, respectively. We have fabricated phosphorescent organic light-emitting devices using the ITO/PEDOT:PSS (40Â nm)/PVK:(OPBT)2Ir(acac) (40Â nm)/Balq (40Â nm)/LiF (1Â nm)/Al (80Â nm) configuration with the iridium complex as a triplet emissive dopant in poly(N-vinylcarbazole) (PVK) host. The electroluminescence (EL) devices showed greenish yellow light emission with maximum peak at 551Â nm. Especially, the maximum external quantum and current efficiency of 1Â mol% doped device were 1.74% and 4.89Â cd/A, respectively.
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Authors
Jae-Ho Choi, Choong-Hwa Jung, Ji Young Kwon, Hoon-Je Cho, Jonghee Lee, Jeong-Ik Lee, Hye-Yong Chu, Do-Hoon Hwang,