| MgO nano-facet embedded silver-based dielectric/metal/dielectric transparent electrode. | |
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MedLine Citation:
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PMID: 22274430 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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We replace Indium Tin Oxide (ITO) with an MgO nano-facet Embedded WO<sub>3</sub>/Ag/WO<sub>3</sub>(WAW) multilayer for electrodes of high efficiency OLEDs. WAW shows higher values for transmittance (93%) and conductivity (1.3×10<sup>5</sup> S/cm) than those of ITO. Moreover, WAW shows higher transmittance (92.5%) than that of ITO (86.4%) in the blue region (<500 nm). However, due to the large difference in refractive indices (n) of glass (n=1.55) and WO<sub>3</sub> (n=1.95), the incident light has a small critical angle (52°). Thus, the generated light is confined by the glass/WAW interface, resulting in low light outcoupling efficiency (~20%). This can be enhanced by using a nano-facet structured MgO (n=1.73) layer and a ZrO<sub>2</sub> (n=1.84) layer as a graded index layer. Using these optimized electrodes, ITO-free, OLEDs with various emission wavelengths have been produced. The luminance of OLEDs using MgO/ZrO<sub>2</sub>/WAW layers is enhanced by 24% compared to that of devices with ITO. |
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Authors:
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Sungjun Kim; Hak Ki Yu; Kihyon Hong; Kisoo Kim; Jun Ho Son; Illhwan Lee; Kyoung-Bo Kim; Tae-Yeob Kim; Jong-Lam Lee |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Optics express Volume: 20 ISSN: 1094-4087 ISO Abbreviation: Opt Express Publication Date: 2012 Jan |
Date Detail:
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Created Date: 2012-01-25 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101137103 Medline TA: Opt Express Country: United States |
Other Details:
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Languages: eng Pagination: 845-53 Citation Subset: IM |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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