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Article: Improving the viewing angle properties of microcavity OLEDs by using dispersive gratings

TitleImproving the viewing angle properties of microcavity OLEDs by using dispersive gratings
Authors
Issue Date2007
PublisherOptical Society of America. The Journal's web site is located at http://www.opticsexpress.org
Citation
Optics Express, 2007, v. 15 n. 20, p. 13288-13294 How to Cite?
AbstractThe changes of emission peak wavelength and angular intensity with viewing angles have been issues for the use of microcavity OLEDs. We will investigate Distributed Bragg Gratings (DBRs) constructed from largely dispersive index materials for reducing the viewing angle dependence. A DBR stack mirror, aiming at a symmetric structure and less number of grating period for a practical fabrication, is studied to achieve a chirp-featured grating for OLEDs with blue emission peak of 450nm. For maximizing the compensation of the viewing angle dependence, the effects of dispersive index, grating structure, thickness of each layer of the grating, grating period and chirp will be comprehensively investigated. The contributions of TE and TM modes to the angular emission power will be analyzed for the grating optimization, which have not been expressed in detail. In studying the light emission of OLEDs, we will investigate the Purcell effect which is important but has not been properly considered. Our results show that with a proper design of the DBR, not only a wider viewing angle can be achieved but also the color purity of OLEDs can be improved. © 2007 Optical Society of America.
Persistent Identifierhttp://hdl.handle.net/10722/155394
ISSN
2015 Impact Factor: 3.148
2015 SCImago Journal Rankings: 2.186
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorChoy, WCHen_US
dc.contributor.authorHo, CYen_US
dc.date.accessioned2012-08-08T08:33:16Z-
dc.date.available2012-08-08T08:33:16Z-
dc.date.issued2007en_US
dc.identifier.citationOptics Express, 2007, v. 15 n. 20, p. 13288-13294en_US
dc.identifier.issn1094-4087en_US
dc.identifier.urihttp://hdl.handle.net/10722/155394-
dc.description.abstractThe changes of emission peak wavelength and angular intensity with viewing angles have been issues for the use of microcavity OLEDs. We will investigate Distributed Bragg Gratings (DBRs) constructed from largely dispersive index materials for reducing the viewing angle dependence. A DBR stack mirror, aiming at a symmetric structure and less number of grating period for a practical fabrication, is studied to achieve a chirp-featured grating for OLEDs with blue emission peak of 450nm. For maximizing the compensation of the viewing angle dependence, the effects of dispersive index, grating structure, thickness of each layer of the grating, grating period and chirp will be comprehensively investigated. The contributions of TE and TM modes to the angular emission power will be analyzed for the grating optimization, which have not been expressed in detail. In studying the light emission of OLEDs, we will investigate the Purcell effect which is important but has not been properly considered. Our results show that with a proper design of the DBR, not only a wider viewing angle can be achieved but also the color purity of OLEDs can be improved. © 2007 Optical Society of America.en_US
dc.languageengen_US
dc.publisherOptical Society of America. The Journal's web site is located at http://www.opticsexpress.orgen_US
dc.relation.ispartofOptics Expressen_US
dc.rightsOptics Express. Copyright © Optical Society of America-
dc.rightsThis paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-15-20-13288. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleImproving the viewing angle properties of microcavity OLEDs by using dispersive gratingsen_US
dc.typeArticleen_US
dc.identifier.emailChoy, WCH:chchoy@eee.hku.hken_US
dc.identifier.authorityChoy, WCH=rp00218en_US
dc.description.naturepublished_or_final_versionen_US
dc.identifier.doi10.1364/OE.15.013288en_US
dc.identifier.scopuseid_2-s2.0-35148837514en_US
dc.identifier.hkuros147766-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-35148837514&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume15en_US
dc.identifier.issue20en_US
dc.identifier.spage13288en_US
dc.identifier.epage13294en_US
dc.identifier.isiWOS:000250006700076-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridChoy, WCH=7006202371en_US
dc.identifier.scopusauthoridHo, CY=22634399300en_US

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