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Issue 23, 2021
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Inverse heavy-atom effect in near infrared photoluminescent gold nanoclusters

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Abstract

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.

Graphical abstract: Inverse heavy-atom effect in near infrared photoluminescent gold nanoclusters

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Submitted
17 Apr 2021
Accepted
19 May 2021
First published
24 May 2021

Nanoscale, 2021,13, 10462-10467
Article type
Paper

Inverse heavy-atom effect in near infrared photoluminescent gold nanoclusters

G. Pramanik, K. Kvakova, M. A. Thottappali, D. Rais, J. Pfleger, M. Greben, A. El-Zoka, S. Bals, M. Dracinsky, J. Valenta and P. Cigler, Nanoscale, 2021, 13, 10462 DOI: 10.1039/D1NR02440J

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