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Spectral fingerprints of individual Mn2+ impurities and Mn2+ pairs in magic-sized nanoclusters

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Title
Spectral fingerprints of individual Mn2+ impurities and Mn2+ pairs in magic-sized nanoclusters
Author(s)
Bieniek, J.; Woonhyuk Baek; Taeghwan Hyeon; Bacher, G.; Fainblat, R.
Publication Date
2023-06
Journal
The Journal of chemical physics, v.158, no.22
Publisher
NLM (Medline)
Abstract
The chemical synthesis of (CdSe)13 magic-sized clusters (MSCs) allows the replacement of host atoms by individual transition metals such as Mn. By analyzing the spectral fingerprints of the Mn2+ photoluminescence (PL) in MSCs with different dopant concentrations, we are able to distinguish between single Mn2+ ions and coupled Mn2+ pairs. In case of Mn2+ pair emission, temperature-dependent studies show a pronounced red shift, followed by a distinct blue shift of the PL energy upon heating. This is related to a spin ladder formation of the ground and excited states due to Mn2+-Mn2+ exchange interaction at cryogenic temperatures, which is assumed to vanish at higher temperatures. In contrast, single Mn2+ ion PL exhibits a unique redshift with increasing temperature, which can be attributed to a particularly strong coupling to vibronic modes due to the ultimate small size of the MSCs. © 2023 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
URI
https://pr.ibs.re.kr/handle/8788114/14405
DOI
10.1063/5.0144867
ISSN
0021-9606
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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