Highly efficient yellow and white phosphorescent organic light-emitting diodes using a benzothiazole-liganded new iridium complex
- Authors
- Xu, Fei; Kwon, Ji-Young; Kim, Ji-Hoon; Kim, Hee Un; Lim, Jong Min; Cho, Hyunduck; Lee, Changhee; Lee, Jonghee; Lee, Jeong-Ik; Hwang, Do-Hoon
- Issue Date
- Sep-2012
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Carbazole; Benzothiazole; Phosphorescent iridium(III) complex; Organic light-emitting devices
- Citation
- SYNTHETIC METALS, v.162, no.15-16, pp 1421 - 1428
- Pages
- 8
- Journal Title
- SYNTHETIC METALS
- Volume
- 162
- Number
- 15-16
- Start Page
- 1421
- End Page
- 1428
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/28136
- DOI
- 10.1016/j.synthmet.2012.06.009
- ISSN
- 0379-6779
- Abstract
- We designed and synthesized a novel yellow-emitting iridium complex, bis[2-(9-ethyl-9H-carbazol-3-yl)-benzothiazole]iridium(III) acetoacetonate [(Btc)(2)Ir(acac)], for use in phosphorescent organic light-emitting diodes. The synthesized compound was characterized by H-1 NMR and C-13 NMR. Photophysical and electrochemical studies revealed photoluminescence emission at 555 nm (in solution) with a band gap energy of 2.37 eV. The phosphorescent organic light-emitting diodes based on ITO/PEDOT:PSS/alpha-NPD/TCTA/CBP:(Btc)(2)Ir(acac)(8%)/BCP/Alq(3)/LiF/Al exhibited a yellow emission at 562 nm with a high luminous efficiency of 35.4 cd/A, a maximum external quantum efficiency of 12.9% at 7.4 V, and a very outstanding luminance of 100,048 cd/m(2). Because of its high electroluminescent performance, efficient white phosphorescent organic light-emitting devices using this new iridium complex in the structure of ITO/TAPC/DCzPPy(x%):FIrpic(14%):(Btc)(2)Ir(acac)(y%)/Bphen/LiF/Al were fabricated. The device, with a new iridium(III) complex doping concentration of 0.15%, exhibited a maximum luminous efficiency as high as 41.6 cd/A at 5 V, CIE coordinates of (0.34, 0.46), a maximum luminance of 25,010 cd/m(2), and a maximum power efficiency of 28.9 lm/W, respectively. (C) 2012 Elsevier B.V. All rights reserved.
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