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Top Emission Organic Light Emitting Diode with a Cr/Al/Cr Anode
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- Authors
- Sung Mook Chung, Chi-Sun Hwang, Jeong-Ik Lee, Sang Hee Ko Park, Yong Suk Yang, Lee-Mi Do, Hye Yong Chu
- Issue Date
- 2007-05
- Citation
- Synthetic Metals, v.157, no.8-9, pp.327-331
- ISSN
- 0379-6779
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- Abstract
- A top emission organic light emitting diode (TEOLED) comprised of a Cr anode on PES film/NPB/Alq3/cathodes has been fabricated. The triple layer structure of Cr/Al/Cr allowed for fabrication of a crack-free anode and provided better thermal stability and higher work function than a conventional ITO anode. For the Cr/Al/Cr anodes, a series of Cr layers with various surface morphology has been tested. A Cr layer with a smooth surface morphology was found to be optimal. The TEOLED fabricated on PES film having good anode surface morphology showed similar device characteristics to that on a Si wafer. TEOLEDs on PES film and Si wafer exhibited a maximum luminous efficiency of 2.87 and 3.0 cd/A, respectively, at 1000 cd/m2 with a NPB/Alq3/LiF/Al/Ag structure on a Cr/Al/Cr anode. © 2007 Elsevier B.V. All rights reserved.
- KSP Keywords
- Device characteristics, Layer structure, Luminous efficiency, Organic light-emitting diodes(OLEDS), Si wafer, Smooth surface, Thermal stability(TGA), Top emission, Work Function, crack-free, light-emitting diode(LED)