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Article: Aggregation-Enhanced Emission in a Red Cu(I) Emitter with Quantum Yield >99%

TitleAggregation-Enhanced Emission in a Red Cu(I) Emitter with Quantum Yield >99%
Authors
Issue Date2-Sep-2022
PublisherAmerican Chemical Society
Citation
ACS Materials Letters, 2022, v. 4, p. 1921-1928 How to Cite?
Abstract

It is a significant challenge to achieve a high photoluminescence quantum yield of Cu(I) complexes, particularly for red Cu(I) emitters, because of their considerable reorganization energy and weak spin–orbit coupling. Herein, we report a red phosphorescent cyclic trinuclear Cu(I) complex (denoted as 1), which was formed by reacting alkyl-substituted pyrazole ligands (4-isobutyl-3,5-dimethyl-1H-pyrazole) with in situ generated Cu(I) ions. Complex 1 was nonemissive in a pure tetrahydrofuran (THF) solution, whereas it emitted intense red light when its molecules were aggregated by adding water to the THF solution. Near-unity photoluminescence quantum yields were achieved in a mixed solvent of THF/water (fe = volwater/volwater+THFfe = 90%), poly(methyl methacrylate) films, and in the solid state. Photophysical analysis and theoretical calculations revealed that the excellent photoluminescence performance was due to the aggregation-enhanced emission. In the aggregation state, cuprophilic interactions dominated the excited state, and the restricted movement of alkyl through CH···C/CH···π interactions diminished nonradiative transition. A cyclic trinuclear Cu(I) complex was used to fabricate a nondoped organic light-emitting diode (OLED), which is the first instance of such Cu(I) materials.


Persistent Identifierhttp://hdl.handle.net/10722/331824
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorYang, H-
dc.contributor.authorZheng, J-
dc.contributor.authorXie, M-
dc.contributor.authorLuo, D-
dc.contributor.authorTang, WJ-
dc.contributor.authorPeng, SK-
dc.contributor.authorCheng, G-
dc.contributor.authorZhang, XJ-
dc.contributor.authorZhou, XP-
dc.contributor.authorChe, CM-
dc.contributor.authorLi, D-
dc.date.accessioned2023-09-21T06:59:14Z-
dc.date.available2023-09-21T06:59:14Z-
dc.date.issued2022-09-02-
dc.identifier.citationACS Materials Letters, 2022, v. 4, p. 1921-1928-
dc.identifier.urihttp://hdl.handle.net/10722/331824-
dc.description.abstract<p>It is a significant challenge to achieve a high photoluminescence quantum yield of Cu(I) complexes, particularly for red Cu(I) emitters, because of their considerable reorganization energy and weak spin–orbit coupling. Herein, we report a red phosphorescent cyclic trinuclear Cu(I) complex (denoted as <strong>1</strong>), which was formed by reacting alkyl-substituted pyrazole ligands (4-isobutyl-3,5-dimethyl-1H-pyrazole) with in situ generated Cu(I) ions. Complex <strong>1</strong> was nonemissive in a pure tetrahydrofuran (THF) solution, whereas it emitted intense red light when its molecules were aggregated by adding water to the THF solution. Near-unity photoluminescence quantum yields were achieved in a mixed solvent of THF/water (<em>f</em><sub>e</sub> = vol<sub>water</sub>/vol<sub>water+THF</sub>, <em>f</em><sub>e</sub> = 90%), poly(methyl methacrylate) films, and in the solid state. Photophysical analysis and theoretical calculations revealed that the excellent photoluminescence performance was due to the aggregation-enhanced emission. In the aggregation state, cuprophilic interactions dominated the excited state, and the restricted movement of alkyl through CH···C/CH···π interactions diminished nonradiative transition. A cyclic trinuclear Cu(I) complex was used to fabricate a nondoped organic light-emitting diode (OLED), which is the first instance of such Cu(I) materials.<br></p>-
dc.languageeng-
dc.publisherAmerican Chemical Society-
dc.relation.ispartofACS Materials Letters-
dc.titleAggregation-Enhanced Emission in a Red Cu(I) Emitter with Quantum Yield >99%-
dc.typeArticle-
dc.identifier.doi10.1021/acsmaterialslett.2c00661-
dc.identifier.scopuseid_2-s2.0-85137867533-
dc.identifier.volume4-
dc.identifier.spage1921-
dc.identifier.epage1928-
dc.identifier.eissn2639-4979-
dc.identifier.isiWOS:000875149200001-
dc.identifier.issnl2639-4979-

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