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Gold nanoclusters with bright near-infrared photoluminescence
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SYSNO ASEP 0489710 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Gold nanoclusters with bright near-infrared photoluminescence Author(s) Pramanik, Goutam (UOCHB-X) ORCID
Humpolíčková, Jana (UOCHB-X) ORCID
Valenta, J. (CZ)
Kundu, P. (BE)
Bals, S. (BE)
Bouř, Petr (UOCHB-X) RID, ORCID
Dračínský, Martin (UOCHB-X) RID, ORCID
Cígler, Petr (UOCHB-X) RID, ORCIDSource Title Nanoscale. - : Royal Society of Chemistry - ISSN 2040-3364
Roč. 10, č. 8 (2018), s. 3792-3798Number of pages 7 s. Language eng - English Country GB - United Kingdom Keywords aggregation-induced emission ; excited state behavior ; quantum yield Subject RIV CF - Physical ; Theoretical Chemistry OECD category Physical chemistry R&D Projects GA16-05935S GA ČR - Czech Science Foundation (CSF) LTC17012 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA18-12533S GA ČR - Czech Science Foundation (CSF) Institutional support UOCHB-X - RVO:61388963 UT WOS 000426148500026 EID SCOPUS 85042607015 DOI 10.1039/c7nr06050e Annotation The increase in nonradiative pathways with decreasing emission energy reduces the luminescence quantum yield (QY) of near-infrared photoluminescent (NIR PL) metal nanoclusters. Efficient surface ligand chemistry can significantly improve the luminescence QY of NIR PL metal nanoclusters. In contrast to the widely reported but modestly effective thiolate ligand-to-metal core charge transfer, we show that metal-to-ligand charge transfer (MLCT) can be used to greatly enhance the luminescence QY of NIR PL gold nanoclusters (AuNCs). We synthesized water-soluble and colloidally stable NIR PL AuNCs with unprecedentedly high QY (similar to 25%) upon introduction of triphenylphosphonium moieties into the surface capping layer. By using a combination of spectroscopic and theoretical methods, we provide evidence for gold core-to-ligand charge transfer occurring in AuNCs. We envision that this work can stimulate the development of these unusually bright AuNCs for promising optoelectronic, bioimaging, and other applications. Workplace Institute of Organic Chemistry and Biochemistry Contact asep@uochb.cas.cz ; Kateřina Šperková, Tel.: 232 002 584 ; Jana Procházková, Tel.: 220 183 418 Year of Publishing 2019 Electronic address http://pubs.rsc.org/en/content/articlehtml/2018/nr/c7nr06050e
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