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Interface Pattern Engineering in Core-Shell Upconverting Nanocrystals: Shedding Light on Critical Parameters and Consequences for the Photoluminescence Properties

Hudry, Damien; De Backer, Annick; Popescu, Radian; Busko, Dmitry; Howard, Ian A.; Bals, Sara; Zhang, Yang; Pedrazo-Tardajos, Adrian; Van Aert, Sandra; Gerthsen, Dagmar; Altantzis, Thomas; Richards, Bryce S.

Abstract:
Advances in controlling energy migration pathways in core-shell lanthanide (Ln)-based hetero-nanocrystals (HNCs) have relied heavily on assumptions about how optically active centers are distributed within individual HNCs. In this article, it is demonstrated that different types of interface patterns can be formed depending on shell growth conditions. Such interface patterns are not only identified but also characterized with spatial resolution ranging from the nanometer- to the atomic-scale. In the most favorable cases, atomic-scale resolved maps of individual particles are obtained. It is also demonstrated that, for the same type of core-shell architecture, the interface pattern can be engineered with thicknesses of just 1 nm up to several tens of nanometers. Total alloying between the core and shell domains is also possible when using ultra-small particles as seeds. Finally, with different types of interface patterns (same architecture and chemical composition of the core and shell domains) it is possible to modify the output color (yellow, red, and green-yellow) or change (improvement or degradation) the absolute upconversion quantum yield. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000139774
Veröffentlicht am 12.11.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Laboratorium für Elektronenmikroskopie (LEM)
Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 25.11.2021
Sprache Englisch
Identifikator ISSN: 1613-6810, 1613-6829
KITopen-ID: 1000139774
HGF-Programm 38.01.05 (POF IV, LK 01) Simulations, Theory, Optics and Analytics (STOA)
Erschienen in Small
Verlag John Wiley and Sons
Band 17
Heft 47
Seiten Art.-Nr. 2104441
Vorab online veröffentlicht am 25.10.2021
Nachgewiesen in Web of Science
Scopus
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