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Article: Red organic light emitting devices with reduced efficiency roll-off behavior by using hybrid fluorescent/phosphorescent emission structure

TitleRed organic light emitting devices with reduced efficiency roll-off behavior by using hybrid fluorescent/phosphorescent emission structure
Authors
KeywordsEfficiency Roll-Off
Energy Transferring
Fluorescence
Organic Light Emitting Devices
Phosphorescence
Issue Date2010
PublisherElsevier S.A.. The Journal's web site is located at http://www.elsevier.com/locate/tsf
Citation
Thin Solid Films, 2010, v. 519 n. 2, p. 872-875 How to Cite?
AbstractOrganic light emitting device (OLED) with a fluorescence-interlayer- phosphorescence emissive structure (FIP EML) is proposed to solve efficiency roll-off issue effectively. By doping fluorescent emitter of 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) and phosphorescent emitter of tris(1-phenylisoquinolinolato-C2,N) iridium(III) (Ir(piq)3) into the different regions of emission zone to form FIP EML in red OLED, an improvement of more than 20% in luminance efficiency roll-off compared with that of typical phosphorescent OLED with single EML in 10-500 mA/cm2 range has been obtained. Detailed mechanisms have been studied. Such improvement should be attributed to the distinct roles of the two emitters, where DCJTB mainly used to influence the carrier transport leading to an improved balance of charge carriers while Ir(piq)3 functions as the radiative decay sites for most generated excitons. Meanwhile, with the help of the formation of FIP EML, the redistribution of excitons in recombination zone, the suppression of non-radiative exciton quenching processes and the elimination of energy transfer loss also contribute to the enhancement of efficiency roll-off. The method proposed here may provide a route to develop efficient OLED for high luminance applications. © 2010 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/155588
ISSN
2015 Impact Factor: 1.761
2015 SCImago Journal Rankings: 0.726
ISI Accession Number ID
Funding AgencyGrant Number
Research Grant Council of the HK Special Administrative Region ChinaHKU 712108
Funding Information:

This work is supported by the grant (HKU# 712108) from the Research Grant Council of the HK Special Administrative Region China We would like to thank Mr Xiaoming He for the measurements of photophysical properties of organic semiconductor materials

References

 

DC FieldValueLanguage
dc.contributor.authorZheng, Ten_US
dc.contributor.authorChoy, WCHen_US
dc.date.accessioned2012-08-08T08:34:14Z-
dc.date.available2012-08-08T08:34:14Z-
dc.date.issued2010en_US
dc.identifier.citationThin Solid Films, 2010, v. 519 n. 2, p. 872-875en_US
dc.identifier.issn0040-6090en_US
dc.identifier.urihttp://hdl.handle.net/10722/155588-
dc.description.abstractOrganic light emitting device (OLED) with a fluorescence-interlayer- phosphorescence emissive structure (FIP EML) is proposed to solve efficiency roll-off issue effectively. By doping fluorescent emitter of 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) and phosphorescent emitter of tris(1-phenylisoquinolinolato-C2,N) iridium(III) (Ir(piq)3) into the different regions of emission zone to form FIP EML in red OLED, an improvement of more than 20% in luminance efficiency roll-off compared with that of typical phosphorescent OLED with single EML in 10-500 mA/cm2 range has been obtained. Detailed mechanisms have been studied. Such improvement should be attributed to the distinct roles of the two emitters, where DCJTB mainly used to influence the carrier transport leading to an improved balance of charge carriers while Ir(piq)3 functions as the radiative decay sites for most generated excitons. Meanwhile, with the help of the formation of FIP EML, the redistribution of excitons in recombination zone, the suppression of non-radiative exciton quenching processes and the elimination of energy transfer loss also contribute to the enhancement of efficiency roll-off. The method proposed here may provide a route to develop efficient OLED for high luminance applications. © 2010 Elsevier B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier S.A.. The Journal's web site is located at http://www.elsevier.com/locate/tsfen_US
dc.relation.ispartofThin Solid Filmsen_US
dc.subjectEfficiency Roll-Offen_US
dc.subjectEnergy Transferringen_US
dc.subjectFluorescenceen_US
dc.subjectOrganic Light Emitting Devicesen_US
dc.subjectPhosphorescenceen_US
dc.titleRed organic light emitting devices with reduced efficiency roll-off behavior by using hybrid fluorescent/phosphorescent emission structureen_US
dc.typeArticleen_US
dc.identifier.emailChoy, WCH:chchoy@eee.hku.hken_US
dc.identifier.authorityChoy, WCH=rp00218en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.tsf.2010.09.010en_US
dc.identifier.scopuseid_2-s2.0-77958468042en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77958468042&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume519en_US
dc.identifier.issue2en_US
dc.identifier.spage872en_US
dc.identifier.epage875en_US
dc.identifier.isiWOS:000284499500057-
dc.publisher.placeSwitzerlanden_US
dc.identifier.scopusauthoridZheng, T=26427890900en_US
dc.identifier.scopusauthoridChoy, WCH=7006202371en_US
dc.identifier.citeulike7854780-

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