Solution processable organic electro-phosphorescent iridium complex based on a benzothiazole derivative
- Authors
- Choi, Jae-Ho; Jung, Choong-Hwa; Kwon, Ji Young; Cho, Hoon-Je; Lee, Jonghee; Lee, Jeong-Ik; Chu, Hye-Yong; Hwang, Do-Hoon
- Issue Date
- Aug-2009
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Electro-phosphorescence; Benzothiazole; Iridium complex; Solution processable
- Citation
- SYNTHETIC METALS, v.159, no.15-16, pp 1517 - 1521
- Pages
- 5
- Journal Title
- SYNTHETIC METALS
- Volume
- 159
- Number
- 15-16
- Start Page
- 1517
- End Page
- 1521
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/27314
- DOI
- 10.1016/j.synthmet.2009.04.021
- ISSN
- 0379-6779
- Abstract
- We have synthesized a new solution processable iridium complex, di[2-(4'-octyloxyphenyl) benzothiazole]iridium(III)acetoacetone, [(OPBT)(2)Ir(acac)], based on benzothiazole derivative for organic electro-phosphorescent devices. The synthesized molecule was identified by H-1 NMR and C-13 NMR, and readily soluble in common organic solvents such as chlorobenzene. The UV-visible absorption and photoluminescence properties of pristine [(OPBT)(2)Ir(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 337 nm and 547 nm, respectively. We have fabricated phosphorescent organic light-emitting devices using the ITO/PEDOT:PSS (40 nm)/PVK:(OPBT)(2)Ir(acac) (40 nm)/Balq (40 nm)/LiF (1 nm)/Al (80nm) 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 551 nm. Especially, the maximum external quantum and Current efficiency of 1 mol% doped device were 1.74% and 4.89 cd/A, respectively. (C) 2009 Elsevier B.V. All rights reserved.
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