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Article: High‐Performance Deep‐Red/Near‐Infrared OLEDs with Tetradentate [Pt(O^N^C^N)] Emitters

TitleHigh‐Performance Deep‐Red/Near‐Infrared OLEDs with Tetradentate [Pt(O^N^C^N)] Emitters
Authors
Keywordsaggregation forms
deep-red emission
near-infrared emission
organic light-emitting devices
platinum(II) complexes
Issue Date2019
PublisherWiley - VCH Verlag GmbH & Co. KGaA. The Journal's web site is located at http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2195-1071
Citation
Advanced Optical Materials, 2019, v. 7 n. 5, p. 1801452 How to Cite?
AbstractThe emission properties of two series of tetradentate Pt(II) emitters in aggregation forms are studied by density functional theory (DFT), time‐dependent DFT calculations, and photoluminescence (PL) measurements. PL quantum yields (PLQYs) of the complexes bearing type‐I O^N^C^N ligands (Pt‐X‐1 and Pt‐X‐2) increase with the dopant concentration in thin film until 100% [pristine Pt(II) complexes]. For complexes bearing type‐II O^N^C^N ligands (Pt‐X‐3 to Pt‐X‐5), their PLQYs in thin film increase as the dopant concentration increases up to a certain threshold and then quickly decrease with further increase in dopant concentration. Organic light‐emitting devices (OLEDs) with neat and doped Pt(II) emitters are fabricated and characterized. High‐efficiency near‐infrared OLEDs with λmax exceeding 700 nm and external quantum efficiencies (EQEs) of up to 15.84% are realized by using a neat Pt‐X‐1 thin film as the emitting layer (EML). For this device, a high EQE of 11.19% is retained at high current density of 100 mA cm−2; by doping Pt‐X‐5 (26 wt%) into a co‐host structure EML, a red emission with λmax of 661 nm, Commission Internationale de l'Eclairage (CIE) coordinates of (0.63, 0.37), and EQE of 21.75% at 1000 cd m−2 are achieved.
Persistent Identifierhttp://hdl.handle.net/10722/269398
ISSN
2023 Impact Factor: 8.0
2023 SCImago Journal Rankings: 2.216
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorCheng, G-
dc.contributor.authorWan, Q-
dc.contributor.authorAng, WH-
dc.contributor.authorKwong, CL-
dc.contributor.authorTo, WP-
dc.contributor.authorChow, PK-
dc.contributor.authorKwok, CCG-
dc.contributor.authorChe, CM-
dc.date.accessioned2019-04-24T08:06:53Z-
dc.date.available2019-04-24T08:06:53Z-
dc.date.issued2019-
dc.identifier.citationAdvanced Optical Materials, 2019, v. 7 n. 5, p. 1801452-
dc.identifier.issn2195-1071-
dc.identifier.urihttp://hdl.handle.net/10722/269398-
dc.description.abstractThe emission properties of two series of tetradentate Pt(II) emitters in aggregation forms are studied by density functional theory (DFT), time‐dependent DFT calculations, and photoluminescence (PL) measurements. PL quantum yields (PLQYs) of the complexes bearing type‐I O^N^C^N ligands (Pt‐X‐1 and Pt‐X‐2) increase with the dopant concentration in thin film until 100% [pristine Pt(II) complexes]. For complexes bearing type‐II O^N^C^N ligands (Pt‐X‐3 to Pt‐X‐5), their PLQYs in thin film increase as the dopant concentration increases up to a certain threshold and then quickly decrease with further increase in dopant concentration. Organic light‐emitting devices (OLEDs) with neat and doped Pt(II) emitters are fabricated and characterized. High‐efficiency near‐infrared OLEDs with λmax exceeding 700 nm and external quantum efficiencies (EQEs) of up to 15.84% are realized by using a neat Pt‐X‐1 thin film as the emitting layer (EML). For this device, a high EQE of 11.19% is retained at high current density of 100 mA cm−2; by doping Pt‐X‐5 (26 wt%) into a co‐host structure EML, a red emission with λmax of 661 nm, Commission Internationale de l'Eclairage (CIE) coordinates of (0.63, 0.37), and EQE of 21.75% at 1000 cd m−2 are achieved.-
dc.languageeng-
dc.publisherWiley - VCH Verlag GmbH & Co. KGaA. The Journal's web site is located at http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2195-1071-
dc.relation.ispartofAdvanced Optical Materials-
dc.rightsThis is the peer reviewed version of the following article: Advanced Optical Materials, 2019, v. 7 n. 5, p. 1801452, which has been published in final form at https://doi.org/10.1002/adom.201801452. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.-
dc.subjectaggregation forms-
dc.subjectdeep-red emission-
dc.subjectnear-infrared emission-
dc.subjectorganic light-emitting devices-
dc.subjectplatinum(II) complexes-
dc.titleHigh‐Performance Deep‐Red/Near‐Infrared OLEDs with Tetradentate [Pt(O^N^C^N)] Emitters-
dc.typeArticle-
dc.identifier.emailCheng, G: ggcheng@hku.hk-
dc.identifier.emailKwong, CL: clkwong4@hku.hk-
dc.identifier.emailTo, WP: kevintwp@hku.hk-
dc.identifier.emailKwok, CCG: cckwok@hku.hk-
dc.identifier.emailChe, CM: chemhead@hku.hk-
dc.identifier.authorityCheng, G=rp02145-
dc.identifier.authorityTo, WP=rp02410-
dc.identifier.authorityKwok, CCG=rp00847-
dc.identifier.authorityChe, CM=rp00670-
dc.description.naturepostprint-
dc.identifier.doi10.1002/adom.201801452-
dc.identifier.scopuseid_2-s2.0-85058979080-
dc.identifier.hkuros297281-
dc.identifier.volume7-
dc.identifier.issue5-
dc.identifier.spage1801452-
dc.identifier.epage1801452-
dc.identifier.isiWOS:000460336000007-
dc.publisher.placeGermany-
dc.identifier.issnl2195-1071-

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