期刊
SYNTHETIC METALS
卷 160, 期 17-18, 页码 1994-1999出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2010.07.024
关键词
Phosphorescent OLED; Electromer; Carbazole; Near-IR; Solution process
资金
- MKE/KEIT [10035225]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10035225] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The solution process is more suitable for large-sized OLED in terms of small material usage and no need for fine mask patterning technique. Among soluble materials, dendrimers are acknowledged as a new class of emissive OLED materials that can carry both the emissive chromophore and the charge transporting moiety simultaneously. Here, we report on a new Ir(III)-based dendrimer and an efficient single emission layer OLED device by spin-coating the dendrimer itself on PEDOT:PSS polymer. This dendrimer carries a pair of carbazole functional groups on the pyridine side and a fluorinated phenyl on the other side of the Ir(ppy)(3) ligand. The latter functional group acts as an electron transporting material and the former as a host and hole-transporting material. The dendrimer device has a green emission at 540 nm with current efficiency as high as 25 Cd/A. Interestingly, we have found that the two neighboring carbazole form the electromer under the applied electrical current and, thus, that the EL device shows new near-IR emission over 720 nm. (C) 2010 Elsevier B.V. All rights reserved.
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