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Conference Paper: Improved performance of OLEDs with ITO surface treatments

TitleImproved performance of OLEDs with ITO surface treatments
Authors
KeywordsITO surface treatment
Organic light emitting diodes
Issue Date2005
PublisherElsevier S.A.. The Journal's web site is located at http://www.elsevier.com/locate/tsf
Citation
Thin Solid Films, 2005, v. 477 n. 1-2, p. 57-62 How to Cite?
Abstract
In this work, we performed systematic study of the influence of oxidative (ultraviolet (UV) ozone) and acid treatments and their combinations on the ITO parameters (work function, carrier concentration and mobility, surface roughness and morphology) and the performance of organic light emitting diodes (OLEDs) fabricated on ITO treated with different treatments. ITO substrates were characterized by Hall measurements, Seebeck coefficient measurements, and surface probe microscopy. After characterization of ITO, we deposited 100 nm (N,N′-di(naphthalene-1-yl)-N,N′-diphenyl-benzidine (NPB) film on the surface of ITO substrates treated with different treatments and characterized it with surface probe microscopy and Seebeck coefficient measurements. Then, OLEDs with structure ITO/NPB/rubrene/tris (8-hydroxyquinoline) aluminum (Alq 3)/LiF/Al were fabricated. The device performance was related to the ITO surface morphology and the ITO work function, while there was no obvious relationship to the ITO carrier concentration and mobility. From the treatments investigated here, it is not possible to distinguish whether relatively flat surface with isolated high spikes is sufficient on its own for good performance, or high work function value together with such surface morphology is required. The maximum luminous efficiency of 2.0 lm/W was obtained for ITO/NPB/rubrene/Alq 3/LiF/Al OLED with HCl followed by UV ozone treatment compared to 1.7 lm/W with UV ozone treatment only. © 2004 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/69773
ISSN
2013 Impact Factor: 1.867
2013 SCImago Journal Rankings: 0.884
ISI Accession Number ID
References

 

Author Affiliations
  1. Jilin University
  2. The University of Hong Kong
DC FieldValueLanguage
dc.contributor.authorLi, CNen_HK
dc.contributor.authorKwong, CYen_HK
dc.contributor.authorDjurišić, ABen_HK
dc.contributor.authorLai, PTen_HK
dc.contributor.authorChui, PCen_HK
dc.contributor.authorChan, WKen_HK
dc.contributor.authorLiu, SYen_HK
dc.date.accessioned2010-09-06T06:16:42Z-
dc.date.available2010-09-06T06:16:42Z-
dc.date.issued2005en_HK
dc.identifier.citationThin Solid Films, 2005, v. 477 n. 1-2, p. 57-62en_HK
dc.identifier.issn0040-6090en_HK
dc.identifier.urihttp://hdl.handle.net/10722/69773-
dc.description.abstractIn this work, we performed systematic study of the influence of oxidative (ultraviolet (UV) ozone) and acid treatments and their combinations on the ITO parameters (work function, carrier concentration and mobility, surface roughness and morphology) and the performance of organic light emitting diodes (OLEDs) fabricated on ITO treated with different treatments. ITO substrates were characterized by Hall measurements, Seebeck coefficient measurements, and surface probe microscopy. After characterization of ITO, we deposited 100 nm (N,N′-di(naphthalene-1-yl)-N,N′-diphenyl-benzidine (NPB) film on the surface of ITO substrates treated with different treatments and characterized it with surface probe microscopy and Seebeck coefficient measurements. Then, OLEDs with structure ITO/NPB/rubrene/tris (8-hydroxyquinoline) aluminum (Alq 3)/LiF/Al were fabricated. The device performance was related to the ITO surface morphology and the ITO work function, while there was no obvious relationship to the ITO carrier concentration and mobility. From the treatments investigated here, it is not possible to distinguish whether relatively flat surface with isolated high spikes is sufficient on its own for good performance, or high work function value together with such surface morphology is required. The maximum luminous efficiency of 2.0 lm/W was obtained for ITO/NPB/rubrene/Alq 3/LiF/Al OLED with HCl followed by UV ozone treatment compared to 1.7 lm/W with UV ozone treatment only. © 2004 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier S.A.. The Journal's web site is located at http://www.elsevier.com/locate/tsfen_HK
dc.relation.ispartofThin Solid Filmsen_HK
dc.subjectITO surface treatmenten_HK
dc.subjectOrganic light emitting diodesen_HK
dc.titleImproved performance of OLEDs with ITO surface treatmentsen_HK
dc.typeConference_Paperen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0040-6090&volume=477&spage=57&epage=62&date=2005&atitle=Improved+performance+of+OLEDs+with+ITO+surface+treatmentsen_HK
dc.identifier.emailDjurišić, AB: dalek@hku.hken_HK
dc.identifier.emailLai, PT: laip@eee.hku.hken_HK
dc.identifier.emailChui, PC: pcchui@hkucc.hku.hken_HK
dc.identifier.emailChan, WK: waichan@hku.hken_HK
dc.identifier.authorityDjurišić, AB=rp00690en_HK
dc.identifier.authorityLai, PT=rp00130en_HK
dc.identifier.authorityChui, PC=rp00114en_HK
dc.identifier.authorityChan, WK=rp00667en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.tsf.2004.08.111en_HK
dc.identifier.scopuseid_2-s2.0-14644388214en_HK
dc.identifier.hkuros97391en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-14644388214&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume477en_HK
dc.identifier.issue1-2en_HK
dc.identifier.spage57en_HK
dc.identifier.epage62en_HK
dc.identifier.isiWOS:000227825600012-
dc.publisher.placeSwitzerlanden_HK
dc.identifier.scopusauthoridLi, CN=8570971400en_HK
dc.identifier.scopusauthoridKwong, CY=35917741900en_HK
dc.identifier.scopusauthoridDjurišić, AB=7004904830en_HK
dc.identifier.scopusauthoridLai, PT=7202946460en_HK
dc.identifier.scopusauthoridChui, PC=13309913400en_HK
dc.identifier.scopusauthoridChan, WK=13310083000en_HK
dc.identifier.scopusauthoridLiu, SY=7409465380en_HK

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