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Organic light-emitting diodes with F16CuPC as an efficient hole injection layer

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Authors
Lee, H. K.; Shin, Y. C.; Kwon, D. S.; Lee, C. H.
Issue Date
2006
Publisher
한국물리학회 = The Korean Physical Society
Citation
J. Korean Phys. Soc. 49, 1037
Abstract
We report a new hole-injection material, copper hexadecafluorophthalocyanine (F$_{16}$CuPC) for organic light-emitting diodes (OLEDs) consisting of N,N'-di(1-naphthyl)-N,N'-diphenylbenzidine ($\alpha$-NPD) as a hole-transport layer and 8-tris-hydroxyquinoline aluminum (Alq$_3$) as a light-emitting and electron-transport layer. The insertion of the F$_{16}$CuPC between indium-tin oxide (ITO) and $\alpha$-NPD reduces the operating voltage significantly and thereby increases the luminous efficiency. By measuring the device characteristics for various F$_{16}$CuPC thicknesses, we find that an optimum F$_{16}$CuPC thickness is about 15 nm. At a luminance of 1000 cd/m$^2$, the device with 15-nm-thick F$_{16}$CuPC shows a luminous efficiency of 1.5 lm/W and a device operating voltage of 7.2 V while the device without the F$_{16}$CuPC layer shows 1.1 lm/W and 10.4 V. The significant decrease in a driving voltage and increase in the luminous efficiency can be attributed to the high hole-injection efficiency when F$_{16}$CuPC is inserted between ITO and $\alpha$-NPD
ISSN
0374-4884 (Print)
1976-8524 (Online)
Language
English
URI
https://hdl.handle.net/10371/13820
DOI
https://doi.org/10.3938/jkps.49.1037
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Journal Papers (저널논문_전기·정보공학부)