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Article: High performance gold(III)-based white organic light-emitting devices with extremely small efficiency roll-off

TitleHigh performance gold(III)-based white organic light-emitting devices with extremely small efficiency roll-off
Authors
KeywordsBinary alloys
Energy transfer
Gold alloys
Gold compounds
Luminance
Issue Date2019
PublisherRSC Publications. The Journal's web site is located at http://pubs.rsc.org/en/journals/journalissues/tc#!recentarticles&all
Citation
Journal of Materials Chemistry C, 2019, v. 7 n. 27, p. 8457-8464 How to Cite?
AbstractHigh performance phosphorescent WOLEDs with small efficiency roll-offs (Δroll-off) at practical brightness levels have been constructed based on a traditional dichromatic structure consisting of yellow emission from alkynylgold(III) Au-Y and blue emission from FIrpic. The optimized WOLED with mCP and PYD2Cz as yellow and blue emissive hosts demonstrates a high current efficiency and EQE of 31.8 cd A−1 and 13.1%, respectively, and a stable cool white emission with CIE coordinates of (0.32 ± 0.02, 0.40 ± 0.01) over a wide luminance range. Unlike some other reported phosphorescent WOLEDs in the literature, our WOLED could operate high efficiencies of 30.4 cd A−1 and 12.9% even operating at a high practical brightness of 1000 cd m−2, giving a small Δroll-off of only 4%. This performance has been greatly improved over those of control devices with standard TCTA/mCBP hosts as well as with TCTA/[mCBP/PYD2Cz] having a composite blue host. The very short-lived emissive lifetime of only 0.4–0.7 μs for Au-Y is a key factor responsible for the small Δroll-off of the devices. Photoluminescence quantum yield (ΦPL) studies also reveal that the increase in ΦPL of Au-Y:mCP due to a more efficient host–emitter energy transfer could lead to a substantial enhancement of the overall performance of the WOLEDs.
Persistent Identifierhttp://hdl.handle.net/10722/277193
ISSN
2019 Impact Factor: 7.059

 

DC FieldValueLanguage
dc.contributor.authorCHEUNG, WL-
dc.contributor.authorLai, SL-
dc.contributor.authorTang, MC-
dc.contributor.authorLee, CH-
dc.contributor.authorChan, MY-
dc.contributor.authorYam, VWW-
dc.date.accessioned2019-09-20T08:46:24Z-
dc.date.available2019-09-20T08:46:24Z-
dc.date.issued2019-
dc.identifier.citationJournal of Materials Chemistry C, 2019, v. 7 n. 27, p. 8457-8464-
dc.identifier.issn2050-7526-
dc.identifier.urihttp://hdl.handle.net/10722/277193-
dc.description.abstractHigh performance phosphorescent WOLEDs with small efficiency roll-offs (Δroll-off) at practical brightness levels have been constructed based on a traditional dichromatic structure consisting of yellow emission from alkynylgold(III) Au-Y and blue emission from FIrpic. The optimized WOLED with mCP and PYD2Cz as yellow and blue emissive hosts demonstrates a high current efficiency and EQE of 31.8 cd A−1 and 13.1%, respectively, and a stable cool white emission with CIE coordinates of (0.32 ± 0.02, 0.40 ± 0.01) over a wide luminance range. Unlike some other reported phosphorescent WOLEDs in the literature, our WOLED could operate high efficiencies of 30.4 cd A−1 and 12.9% even operating at a high practical brightness of 1000 cd m−2, giving a small Δroll-off of only 4%. This performance has been greatly improved over those of control devices with standard TCTA/mCBP hosts as well as with TCTA/[mCBP/PYD2Cz] having a composite blue host. The very short-lived emissive lifetime of only 0.4–0.7 μs for Au-Y is a key factor responsible for the small Δroll-off of the devices. Photoluminescence quantum yield (ΦPL) studies also reveal that the increase in ΦPL of Au-Y:mCP due to a more efficient host–emitter energy transfer could lead to a substantial enhancement of the overall performance of the WOLEDs.-
dc.languageeng-
dc.publisherRSC Publications. The Journal's web site is located at http://pubs.rsc.org/en/journals/journalissues/tc#!recentarticles&all-
dc.relation.ispartofJournal of Materials Chemistry C-
dc.subjectBinary alloys-
dc.subjectEnergy transfer-
dc.subjectGold alloys-
dc.subjectGold compounds-
dc.subjectLuminance-
dc.titleHigh performance gold(III)-based white organic light-emitting devices with extremely small efficiency roll-off-
dc.typeArticle-
dc.identifier.emailLai, SL: slllai@hku.hk-
dc.identifier.emailTang, MC: kobetang@hku.hk-
dc.identifier.emailLee, CH: mrcllee@connect.hku.hk-
dc.identifier.emailChan, MY: chanmym@hku.hk-
dc.identifier.emailYam, VWW: wwyam@hku.hk-
dc.identifier.authorityChan, MY=rp00666-
dc.identifier.authorityYam, VWW=rp00822-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1039/C9TC01796H-
dc.identifier.scopuseid_2-s2.0-85068967704-
dc.identifier.hkuros305986-
dc.identifier.volume7-
dc.identifier.issue27-
dc.identifier.spage8457-
dc.identifier.epage8464-
dc.publisher.placeUnited Kingdom-

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