期刊
THIN SOLID FILMS
卷 520, 期 23, 页码 6954-6958出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2012.07.084
关键词
Organic light emitting diode; Inkjet; Solution process; Small molecules
类别
资金
- Industrial strategic technology development program [10035225]
- MKE/KEIT
- Korea Evaluation Institute of Industrial Technology (KEIT) [10035225] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
High efficiency phosphorescent organic light emitting diodes (OLEDs) are realized by inkjet printing based on small molecules commonly used in vacuum processes in spite of the limitation of the limited solubility. The OLEDs used the inkjet printed 5 wt.% tris(2-phenylpyridine)iridium(III) (Ir(ppy)(3)) doped in 4,4'-Bis(carbazol-9-yl)biphenyl (CBP) as the light emitting layer on various small molecule based hole transporting layers, which are widely used in the fabrication of OLEDs by vacuum processes. The OLEDs resulted in the high power and the external quantum efficiencies of 29.9 lm/W and 11.7%, respectively, by inkjet printing the CBP:Ir(ppy)(3) on a 40 nm thick 4,4',4 ''-tris(carbazol-9-yl)triphenylamine layer. The performance was very close to a vacuum deposited device with a similar structure. (C) 2012 Elsevier B.V. All rights reserved.
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