| Improving the outcoupling efficiency of indium-tin-oxide-free organic light-emitting diodes via rough internal interfaces. | |
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MedLine Citation:
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PMID: 21165096 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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We present low-cost texturing methods to produce different surface roughnesses on glass substrates. Using sand blasting, abrasion and wet etching we achieve roughnesses of about 50 nm to 250 nm (root mean squared roughness Rq). These textured substrates are used as extraction elements for guided modes and substrate modes in organic light-emitting diodes (OLEDs). We evaporate 50 nm of the high index material Ta₂O₅ on the textured substrate, which acts as waveguide layer, and flatten it with the transparent photoresist SU-8. On top of that, we fabricate indium tin oxide (ITO)-free OLEDs, which are characterized by electroluminescence and photoluminescence measurements. The devices with rough interfaces obtain an up to 37.4% and 15.5% (at 20 mA/cm²) enhanced emission and it is shown that the enhancement is due to an increased outcoupling efficiency. |
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Authors:
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Boris Riedel; Inga Kaiser; Julian Hauss; Uli Lemmer; Martina Gerken |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Optics express Volume: 18 Suppl 4 ISSN: 1094-4087 ISO Abbreviation: Opt Express Publication Date: 2010 Nov |
Date Detail:
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Created Date: 2010-12-17 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: A631-9 Citation Subset: IM |
Affiliation:
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Light Technology Institute, Karlsruhe Institute of Technology, Kaiserstrasse 12, D-76131 Karlsruhe, Germany. riedel@kit.edu |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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