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Conference Paper: Evolution of optical properties of tris (8-hydroxyquinoline) aluminum (Alq3) with atmosphere exposure

TitleEvolution of optical properties of tris (8-hydroxyquinoline) aluminum (Alq3) with atmosphere exposure
Authors
KeywordsPhotoluminescence
Tris (8-hydroxyquinoline) aluminum
Issue Date2002
PublisherS P I E - International Society for Optical Engineering. The Journal's web site is located at http://spie.org/x1848.xml
Citation
Organic Light-Emitting Materials and Devices VI, Seattle, Washington, USA, 8-10 July 2002, v. 4800, p. 200-207 How to Cite?
AbstractTris (8-hydroxyquinoline) aluminum (Alq3) represents a material of significant interest for electron transport and/or light emitting layer applications in organic light emitting diodes (OLEDs). In spite of advances in Alq3 based devices, the knowledge and understanding of the optical properties of Alq3 and its chemical and environmental stability is still limited. With the reports of decreased turn-on voltage and increased efficiency of OLEDs, the issues of lifetime and stability of those devices are attracting increasing attention. The degradation of Alq3 based OLEDs and dark spots formation and growth have been intensively studied. The studies on degradation of optical properties of Alq3 itself remain scarce. We have investigated effects of atmosphere exposure to properties of tris (8-hydroxyquinoline) aluminum (Alq3) thin films by photoluminescence (PL) and absorption measurements. Alq3 films were evaporated on glass substrates at different temperatures. The influence of annealing to the environmental stability of the films has also been investigated. It has been found that deposition at higher substrate temperature and annealing of the samples deposited at room temperature yields improvement in environmental stability of the films, i.e. less decrease of the PL intensity over time with atmosphere exposure, as well as increased PL intensity. To investigate further effects of the air exposure, films deposited at room temperature were stored for four days in air, nitrogen, and oxygen. No decrease in PL intensity has been found for storage in nitrogen, while decrease for the film stored in oxygen was smaller than that for film stored in air, indicating that both humidity and oxygen play a role in PL intensity decrease in Alq3 thin films.
Persistent Identifierhttp://hdl.handle.net/10722/45700
ISSN
References

 

DC FieldValueLanguage
dc.contributor.authorDjurišić, ABen_HK
dc.contributor.authorLau, TWen_HK
dc.contributor.authorKwong, CYen_HK
dc.contributor.authorLam, LSMen_HK
dc.contributor.authorChan, WKen_HK
dc.date.accessioned2007-10-30T06:33:02Z-
dc.date.available2007-10-30T06:33:02Z-
dc.date.issued2002en_HK
dc.identifier.citationOrganic Light-Emitting Materials and Devices VI, Seattle, Washington, USA, 8-10 July 2002, v. 4800, p. 200-207en_HK
dc.identifier.issn0277-786Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/45700-
dc.description.abstractTris (8-hydroxyquinoline) aluminum (Alq3) represents a material of significant interest for electron transport and/or light emitting layer applications in organic light emitting diodes (OLEDs). In spite of advances in Alq3 based devices, the knowledge and understanding of the optical properties of Alq3 and its chemical and environmental stability is still limited. With the reports of decreased turn-on voltage and increased efficiency of OLEDs, the issues of lifetime and stability of those devices are attracting increasing attention. The degradation of Alq3 based OLEDs and dark spots formation and growth have been intensively studied. The studies on degradation of optical properties of Alq3 itself remain scarce. We have investigated effects of atmosphere exposure to properties of tris (8-hydroxyquinoline) aluminum (Alq3) thin films by photoluminescence (PL) and absorption measurements. Alq3 films were evaporated on glass substrates at different temperatures. The influence of annealing to the environmental stability of the films has also been investigated. It has been found that deposition at higher substrate temperature and annealing of the samples deposited at room temperature yields improvement in environmental stability of the films, i.e. less decrease of the PL intensity over time with atmosphere exposure, as well as increased PL intensity. To investigate further effects of the air exposure, films deposited at room temperature were stored for four days in air, nitrogen, and oxygen. No decrease in PL intensity has been found for storage in nitrogen, while decrease for the film stored in oxygen was smaller than that for film stored in air, indicating that both humidity and oxygen play a role in PL intensity decrease in Alq3 thin films.en_HK
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dc.languageengen_HK
dc.publisherS P I E - International Society for Optical Engineering. The Journal's web site is located at http://spie.org/x1848.xmlen_HK
dc.relation.ispartofProceedings of SPIE - The International Society for Optical Engineeringen_HK
dc.rightsS P I E - the International Society for Optical Proceedings. Copyright © S P I E - International Society for Optical Engineering.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsCopyright 2003 Society of Photo-Optical Instrumentation Engineers. This paper was published in Organic Light-Emitting Materials and Devices VI, Seattle, Washington, USA, 8-10 July 2002, v. 4800, p. 200-207 and is made available as an electronic reprint with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.en_HK
dc.subjectPhotoluminescenceen_HK
dc.subjectTris (8-hydroxyquinoline) aluminumen_HK
dc.titleEvolution of optical properties of tris (8-hydroxyquinoline) aluminum (Alq3) with atmosphere exposureen_HK
dc.typeConference_Paperen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0277-786X&volume=4800&spage=200&epage=207&date=2003&atitle=Evolution+of+optical+properties+of+tris+(8-hydroxyquinoline)+aluminum+(Alq3)+with+atmosphere+exposureen_HK
dc.identifier.emailDjurišić, AB: dalek@hku.hken_HK
dc.identifier.emailChan, WK: waichan@hku.hken_HK
dc.identifier.authorityDjurišić, AB=rp00690en_HK
dc.identifier.authorityChan, WK=rp00667en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1117/12.451846en_HK
dc.identifier.scopuseid_2-s2.0-17344382113en_HK
dc.identifier.hkuros80252-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-17344382113&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume4800en_HK
dc.identifier.spage200en_HK
dc.identifier.epage207en_HK
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridDjurišić, AB=7004904830en_HK
dc.identifier.scopusauthoridLau, TW=36920289100en_HK
dc.identifier.scopusauthoridKwong, CY=35917741900en_HK
dc.identifier.scopusauthoridLam, LSM=7201984714en_HK
dc.identifier.scopusauthoridChan, WK=13310083000en_HK

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