Ca/Ag bilayer cathode for transparent white organic light-emitting devices
| Autor: | Jeong In Han, C.J. Lee, Ramchandra Balaji Pode, D.G. Moon |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Materials science
Bilayer Analytical chemistry General Physics and Astronomy Surfaces and Interfaces General Chemistry Condensed Matter Physics Cathode Surfaces Coatings and Films Anode law.invention Metal X-ray photoelectron spectroscopy Sputtering law visual_art visual_art.visual_art_medium Transmittance Sheet resistance |
| Zdroj: | Applied Surface Science. 253:4249-4253 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2006.09.026 |
| Popis: | We have demonstrated that the compositional modification of the Ca/Ag films is principally responsible for a high transmittance (over 70% in the visible range) and low sheet resistance (10–12 Ω/sq). X-ray photoelectron spectroscopy (XPS) sputter depth profiling of Ca/Ag structure reveals the presence of Ca(OH) 2 and Ca metal. A chemical model of the Ca/Ag cathode is proposed. Using transparent ITO anode and Ca (10 nm)/Ag (10 nm) cathode, efficient white organic light-emitting devices (WOLEDs) emitting from both sides have been fabricated. Brightness of 3813 cd/m 2 and Commission Internationale de l’Eclairage (CIE) coordinates (0.36, 0.34) at 10 V through ITO anode and values of 1216 cd/m 2 and (0.33, 0.30) through Ca/Ag cathode are reported. A low turn-on voltage of 5.5 V is measured. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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