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Article: Molecular Design of Efficient Yellow- to Red-Emissive Alkynylgold(iii) Complexes for the Realization of Thermally Activated Delayed Fluorescence (TADF) and Their Applications in Solution-Processed Organic Light-Emitting Devices

TitleMolecular Design of Efficient Yellow- to Red-Emissive Alkynylgold(iii) Complexes for the Realization of Thermally Activated Delayed Fluorescence (TADF) and Their Applications in Solution-Processed Organic Light-Emitting Devices
Authors
KeywordsLake level
Mid-latitude Asia
Organic carbon isotope
Paq
Submerged plants
Issue Date2021
PublisherRoyal Society of Chemistry: Open Access Journals. The Journal's web site is located at http://www.rsc.org/publishing/journals/sc/About.asp
Citation
Chemical Science, 2021, v. 12 n. 27, p. 9516-9527 How to Cite?
AbstractHere, we report the design and synthesis of a new class of fused heterocyclic alkynyl ligand-containing gold(III) complexes, which show tunable emission colors spanning from the yellow to red region in the solid state and exhibit thermally activated delayed fluorescence (TADF) properties. These complexes display high photoluminescence quantum yields of up to 0.87 and short excited-state lifetimes in sub-microsecond timescales, yielding high radiative decay rate constants on the order of up to 106 s−1. The observation of the drastic enhancement in the emission intensity of the complexes with insignificant change in the excited-state lifetime upon increasing the temperature from 200 to 360 K indicates an increasing radiative decay rate. The experimentally estimated energy splitting between the lowest-lying singlet excited state (S1) and the lowest-lying triplet excited state (T1), ΔES1–T1, is found to be as small as ∼0.03 eV (250 cm−1), comparable to the value of ∼0.05 eV (435 cm−1) obtained from computational studies. The delicate choice of the cyclometalating ligand and the fused heterocyclic ligand is deemed the key to induce TADF through the control of the energy levels of the intraligand and the ligand-to-ligand charge transfer excited states. This work represents the realization of highly emissive yellow- to red-emitting gold(III) TADF complexes incorporated with fused heterocyclic alkynyl ligands and their applications in organic light-emitting devices.
Persistent Identifierhttp://hdl.handle.net/10722/304946
ISSN
2020 Impact Factor: 9.825
2020 SCImago Journal Rankings: 3.687
PubMed Central ID

 

DC FieldValueLanguage
dc.contributor.authorAU YEUNG, CC-
dc.contributor.authorLi, LK-
dc.contributor.authorTang, MC-
dc.contributor.authorLai, SL-
dc.contributor.authorCHEUNG, WL-
dc.contributor.authorNg, M-
dc.contributor.authorChan, MY-
dc.contributor.authorYam, VWW-
dc.date.accessioned2021-10-05T02:37:31Z-
dc.date.available2021-10-05T02:37:31Z-
dc.date.issued2021-
dc.identifier.citationChemical Science, 2021, v. 12 n. 27, p. 9516-9527-
dc.identifier.issn2041-6520-
dc.identifier.urihttp://hdl.handle.net/10722/304946-
dc.description.abstractHere, we report the design and synthesis of a new class of fused heterocyclic alkynyl ligand-containing gold(III) complexes, which show tunable emission colors spanning from the yellow to red region in the solid state and exhibit thermally activated delayed fluorescence (TADF) properties. These complexes display high photoluminescence quantum yields of up to 0.87 and short excited-state lifetimes in sub-microsecond timescales, yielding high radiative decay rate constants on the order of up to 106 s−1. The observation of the drastic enhancement in the emission intensity of the complexes with insignificant change in the excited-state lifetime upon increasing the temperature from 200 to 360 K indicates an increasing radiative decay rate. The experimentally estimated energy splitting between the lowest-lying singlet excited state (S1) and the lowest-lying triplet excited state (T1), ΔES1–T1, is found to be as small as ∼0.03 eV (250 cm−1), comparable to the value of ∼0.05 eV (435 cm−1) obtained from computational studies. The delicate choice of the cyclometalating ligand and the fused heterocyclic ligand is deemed the key to induce TADF through the control of the energy levels of the intraligand and the ligand-to-ligand charge transfer excited states. This work represents the realization of highly emissive yellow- to red-emitting gold(III) TADF complexes incorporated with fused heterocyclic alkynyl ligands and their applications in organic light-emitting devices.-
dc.languageeng-
dc.publisherRoyal Society of Chemistry: Open Access Journals. The Journal's web site is located at http://www.rsc.org/publishing/journals/sc/About.asp-
dc.relation.ispartofChemical Science-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectLake level-
dc.subjectMid-latitude Asia-
dc.subjectOrganic carbon isotope-
dc.subjectPaq-
dc.subjectSubmerged plants-
dc.titleMolecular Design of Efficient Yellow- to Red-Emissive Alkynylgold(iii) Complexes for the Realization of Thermally Activated Delayed Fluorescence (TADF) and Their Applications in Solution-Processed Organic Light-Emitting Devices-
dc.typeArticle-
dc.identifier.emailLai, SL: slllai@hku.hk-
dc.identifier.emailChan, MY: chanmym@hku.hk-
dc.identifier.emailYam, VWW: deanmail@hku.hk-
dc.identifier.authorityChan, MY=rp00666-
dc.identifier.authorityYam, VWW=rp00822-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1039/D1SC02256C-
dc.identifier.pmid34349927-
dc.identifier.pmcidPMC8278967-
dc.identifier.scopuseid_2-s2.0-85110152709-
dc.identifier.hkuros326364-
dc.identifier.volume12-
dc.identifier.issue27-
dc.identifier.spage9516-
dc.identifier.epage9527-
dc.publisher.placeUnited Kingdom-

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