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Article: Optical and ESR studies of Tris(8-hydroxyquinoline)aluminum

TitleOptical and ESR studies of Tris(8-hydroxyquinoline)aluminum
Authors
KeywordsESR
Stability
Tris-(8-hydroxyquinoline)aluminum (AlQ)
Issue Date2004
PublisherElsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/mseb
Citation
Materials Science And Engineering B: Solid-State Materials For Advanced Technology, 2004, v. 106 n. 1, p. 85-88 How to Cite?
AbstractTris(8-hydroxyquinoline)aluminum (AlQ) powder has been characterized using photoluminescence and electron spin resonance (ESR). The broad asymmetric excitation band is centered at ∼425nm, while the emission band centered at ∼505nm is similar to those reported in films. A significant ESR signal with a linewidth of 10G and g-value of 2.0038 has been observed in as synthesized AlQ powder at room temperature. The signal at same position is present in AlQ powder as-received from Aldrich, as synthesized AlQ powder, and AlQ powder purified by vacuum sublimation. The appearance of the ESR signal is attributed to organic free radicals. Moreover, exposure of AlQ powder to humid air enhances the ESR signal intensity which increases linearly with exposure duration. This is in agreement with recently proposed degradation mechanism in AlQ based organic light emitting diodes, where degradation was attributed to unstable cationic AlQ species. The discovery of natural free radicals in freshly synthesized AlQ may be useful to prevent the degradation of AlQ and other analogous compounds in organic light emitting diodes (OLEDs). © 2003 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/80735
ISSN
2015 Impact Factor: 2.331
2015 SCImago Journal Rankings: 0.723
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorRoy, VALen_HK
dc.contributor.authorPode, RBen_HK
dc.contributor.authorRao, TKGen_HK
dc.contributor.authorDjurišić, ABen_HK
dc.contributor.authorBaldacchini, Gen_HK
dc.date.accessioned2010-09-06T08:09:42Z-
dc.date.available2010-09-06T08:09:42Z-
dc.date.issued2004en_HK
dc.identifier.citationMaterials Science And Engineering B: Solid-State Materials For Advanced Technology, 2004, v. 106 n. 1, p. 85-88en_HK
dc.identifier.issn0921-5107en_HK
dc.identifier.urihttp://hdl.handle.net/10722/80735-
dc.description.abstractTris(8-hydroxyquinoline)aluminum (AlQ) powder has been characterized using photoluminescence and electron spin resonance (ESR). The broad asymmetric excitation band is centered at ∼425nm, while the emission band centered at ∼505nm is similar to those reported in films. A significant ESR signal with a linewidth of 10G and g-value of 2.0038 has been observed in as synthesized AlQ powder at room temperature. The signal at same position is present in AlQ powder as-received from Aldrich, as synthesized AlQ powder, and AlQ powder purified by vacuum sublimation. The appearance of the ESR signal is attributed to organic free radicals. Moreover, exposure of AlQ powder to humid air enhances the ESR signal intensity which increases linearly with exposure duration. This is in agreement with recently proposed degradation mechanism in AlQ based organic light emitting diodes, where degradation was attributed to unstable cationic AlQ species. The discovery of natural free radicals in freshly synthesized AlQ may be useful to prevent the degradation of AlQ and other analogous compounds in organic light emitting diodes (OLEDs). © 2003 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier SA. The Journal's web site is located at http://www.elsevier.com/locate/mseben_HK
dc.relation.ispartofMaterials Science and Engineering B: Solid-State Materials for Advanced Technologyen_HK
dc.subjectESRen_HK
dc.subjectStabilityen_HK
dc.subjectTris-(8-hydroxyquinoline)aluminum (AlQ)en_HK
dc.titleOptical and ESR studies of Tris(8-hydroxyquinoline)aluminumen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0921-5093&volume=106&spage=85&epage=88&date=2004&atitle=Optical+and+ESR+studies+of+Tris(8-hydroxyquinoline)aluminumen_HK
dc.identifier.emailDjurišić, AB: dalek@hku.hken_HK
dc.identifier.authorityDjurišić, AB=rp00690en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.mseb.2003.09.017en_HK
dc.identifier.scopuseid_2-s2.0-0344014305en_HK
dc.identifier.hkuros85641en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0344014305&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume106en_HK
dc.identifier.issue1en_HK
dc.identifier.spage85en_HK
dc.identifier.epage88en_HK
dc.identifier.isiWOS:000187405800013-
dc.publisher.placeSwitzerlanden_HK
dc.identifier.scopusauthoridRoy, VAL=7005870324en_HK
dc.identifier.scopusauthoridPode, RB=7004113563en_HK
dc.identifier.scopusauthoridRao, TKG=8057786700en_HK
dc.identifier.scopusauthoridDjurišić, AB=7004904830en_HK
dc.identifier.scopusauthoridBaldacchini, G=7005238792en_HK

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