| Soft holographic interference lithography microlens for enhanced organic light emitting diode light extraction. | |
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MedLine Citation:
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PMID: 21747547 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Very uniform 2 μm-pitch square microlens arrays (μLAs), embossed on the blank glass side of an indium-tin-oxide (ITO)-coated 1.1 mm-thick glass, are used to enhance light extraction from organic light-emitting diodes (OLEDs) by ~100%, significantly higher than enhancements reported previously. The array design and size relative to the OLED pixel size appear to be responsible for this enhancement. The arrays are fabricated by very economical soft lithography imprinting of a polydimethylsiloxane (PDMS) mold (itself obtained from a Ni master stamp that is generated from holographic interference lithography of a photoresist) on a UV-curable polyurethane drop placed on the glass. Green and blue OLEDs are then fabricated on the ITO to complete the device. When the μLA is ~15 × 15 mm<sup>2</sup>, i.e., much larger than the ~3 × 3 mm<sup>2</sup> OLED pixel, the electroluminescence (EL) in the forward direction is enhanced by ~100%. Similarly, a 19 × 25 mm<sup>2</sup> μLA enhances the EL extracted from a 3 × 3 array of 2 × 2 mm<sup>2</sup> OLED pixels by 96%. Simulations that include the effects of absorption in the organic and ITO layers are in accordance with the experimental results and indicate that a thinner 0.7 mm thick glass would yield a ~140% enhancement. |
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Authors:
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Joong-Mok Park; Zhengqing Gan; Wai Y Leung; Rui Liu; Zhuo Ye; Kristen Constant; Joseph Shinar; Ruth Shinar; Kai-Ming Ho |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Optics express Volume: 19 Suppl 4 ISSN: 1094-4087 ISO Abbreviation: Opt Express Publication Date: 2011 Jul |
Date Detail:
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Created Date: 2011-07-12 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: A786-92 Citation Subset: IM |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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