Number of the records: 1
Inverse heavy-atom effect in near infrared photoluminescent gold nanoclusters
- 1.
SYSNO ASEP 0543233 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Inverse heavy-atom effect in near infrared photoluminescent gold nanoclusters Author(s) Pramanik, Goutam (UOCHB-X) ORCID
Kvaková, Klaudia (UOCHB-X) ORCID
Thottappali, Muhammed Arshad (UMCH-V) RID
Rais, David (UMCH-V) RID
Pfleger, Jiří (UMCH-V) RID
Greben, M. (CZ)
El-Zoka, A. (BE)
Bals, S. (BE)
Dračínský, Martin (UOCHB-X) RID, ORCID
Valenta, J. (CZ)
Cígler, Petr (UOCHB-X) RID, ORCIDSource Title Nanoscale. - : Royal Society of Chemistry - ISSN 2040-3364
Roč. 13, č. 23 (2021), s. 10462-10467Number of pages 6 s. Language eng - English Country GB - United Kingdom Keywords excited-state behavior ; protected gold ; optical properties OECD category Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect) R&D Projects GA18-12533S GA ČR - Czech Science Foundation (CSF) LTAUSA19066 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UOCHB-X - RVO:61388963 ; UMCH-V - RVO:61389013 UT WOS 000657052500001 EID SCOPUS 85108531117 DOI 10.1039/d1nr02440j Annotation Fluorophores functionalized with heavy elements show enhanced intersystem crossing due to increased spin–orbit coupling, which in turn shortens the fluorescence decay lifetime (τPL). This phenomenon is known as the heavy-atom effect (HAE). Here, we report the observation of increased τPL upon functionalisation of near-infrared photoluminescent gold nanoclusters with iodine. The heavy atom-mediated increase in τPL is in striking contrast with the HAE and referred to as inverse HAE. Femtosecond and nanosecond transient absorption spectroscopy revealed overcompensation of a slight decrease in lifetime of the transition associated with the Au core (ps) by a large increase in the long-lived triplet state lifetime associated with the Au shell, which contributed to the observed inverse HAE. This unique observation of inverse HAE in gold nanoclusters provides the means to enhance the triplet excited state lifetime. 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 2022 Electronic address https://doi.org/10.1039/D1NR02440J
Number of the records: 1