Please use this identifier to cite or link to this item: https://ktisis.cut.ac.cy/handle/10488/7603
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dc.contributor.authorChoulis, Stelios A.-
dc.contributor.authorKrummacher, Benjamin C.-
dc.contributor.authorMathai, Mathew K.-
dc.contributor.otherΧούλης, Στέλιος Α.-
dc.date.accessioned2013-03-04T14:13:30Zen
dc.date.accessioned2013-05-17T05:22:52Z-
dc.date.accessioned2015-12-02T10:11:52Z-
dc.date.available2013-03-04T14:13:30Zen
dc.date.available2013-05-17T05:22:52Z-
dc.date.available2015-12-02T10:11:52Z-
dc.date.issued2006-09-01-
dc.identifier.citationJournal of applied physics, 2006, vol.100, no. 5, pp. 1-6en_US
dc.identifier.issn1089-7550-
dc.description.abstractThe external light output of organic light emitting diodes (OLEDs) can be increased by modifying the light emitting surface. The apparent light extraction enhancement is given by the ratio between the efficiency of the unmodified device and the efficiency of the modified device. This apparent light extraction enhancement is dependent on the OLED architecture itself and is not the correct value to judge the effectiveness of a technique to enhance light outcoupling due to substrate surface modification. We propose a general method to evaluate substrate surface modification techniques for light extraction enhancement of OLEDs independent from the device architecture. This method is experimentally demonstrated using green electrophosphorescent OLEDs with different device architectures. The substrate surface of these OLEDs was modified by applying a prismatic film to increase light outcoupling from the device stack. It was demonstrated that the conventionally measured apparent light extraction enhancement by means of the prismatic film does not reflect the actual performance of the light outcoupling technique. Rather, by comparing the light extracted out of the prismatic film to that generated in the OLED layers and coupled into the substrate (before the substrate/air interface), a more accurate evaluation of light outcoupling enhancement can be achieved. Furthermore we show that substrate surface modification can change the output spectrum of a broad band emitting OLEDen_US
dc.formatpdfen_US
dc.language.isoenen_US
dc.publisherAmerican Institute of Physicsen
dc.relation.ispartofJournal of Applied Physicsen_US
dc.rights© American Institute of Physicsen_US
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/us/*
dc.subjectElectroluminescenceen_US
dc.subjectLight emitting diodesen_US
dc.titleGeneral method to evaluate substrate surface modification techniques for light extraction enhancement of organic light emitting diodesen_US
dc.typeArticleen_US
dc.affiliationOsram Opto Semiconductors, Inc.en
dc.collaborationUniversity of Erlangen-Nurembergen_US
dc.countryCyprusen_US
dc.subject.fieldEngineering and Technologyen_US
dc.publicationPeer Revieweden_US
dc.identifier.doi10.1063/1.2234550en_US
dc.dept.handle123456789/54en
dc.relation.issue5en_US
dc.relation.volume100en_US
cut.common.academicyear2006-2007en_US
dc.identifier.spage1en_US
dc.identifier.epage6en_US
item.cerifentitytypePublications-
item.fulltextNo Fulltext-
item.grantfulltextnone-
item.languageiso639-1en-
item.openairecristypehttp://purl.org/coar/resource_type/c_6501-
item.openairetypearticle-
crisitem.journal.journalissn1089-7550-
crisitem.journal.publisherAmerican Institute of Physics-
crisitem.author.deptDepartment of Mechanical Engineering and Materials Science and Engineering-
crisitem.author.facultyFaculty of Engineering and Technology-
crisitem.author.orcid0000-0002-7899-6296-
crisitem.author.parentorgFaculty of Engineering and Technology-
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