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An up-conversion luminophore with high quantum yield and brightness based on BaF$_{2}$:Yb$^{3+}$,Er$^{3+}$ single crystals

Madirov, Eduard I. 1; Konyushkin, Vasilii A.; Nakladov, Andrey N.; Fedorov, Pavel P.; Bergfeldt, Thomas 2; Busko, Dmitry 1; Howard, Ian A. 1,3; Richards, Bryce S. ORCID iD icon 1,3; Kuznetsov, Sergey V.; Turshatov, Andrey 1
1 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)
2 Karlsruher Institut für Technologie (KIT)
3 Lichttechnisches Institut (LTI), Karlsruher Institut für Technologie (KIT)

Up-conversion (UC) of near-infrared radiation to visible light has received much attention because of its use in the conversion of solar radiation, luminescence thermometry, biosensing, and anti-counterfeiting applications. However, the main issue hindering the successful utilization of UC is the relatively low quantum efficiency of the process. In order to design new UC systems with high quantum yield (ϕ$_{UC}$) values, we synthesized two series of co-doped BaF$_{2}$ single crystals with nominal concentrations of Yb$^{3+}$ (2–15 mol%)/Er$^{3+}$ (2 mol%) as well as Yb$^{3+}$ (3 mol%)/Er$^{3+}$ (2–15 mol%). The highest ϕ$_{UC}$ value of 10.0% was demonstrated for the BaF$_{2}$:Er$^{3+}$ (2 mol%) and Yb$^{3+}$ (3 mol%) sample under 490 W cm$^{-2}$ of 976 nm excitation. To study the natural limit of UC efficiency, quantum yield values upon direct excitation (ϕ$_{DS}$) of the $^{4}$S$_{3/2}$ (ϕ$_{DS}$ ≤ 26%) levels were measured. Comparison of experimental values of quantum yields to the ones obtained using Judd–Ofelt theory reveals strong quenching of the $^{4}$S$_{3/2}$ state for all investigated compositions. In addition, we observed an unusually strong contribution of the Er$^{3+}$:4I$_{9/2}$ excited state to both UC and down-shifting luminescent processes. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000130442
Veröffentlicht am 11.03.2021
DOI: 10.1039/d1tc00104c
Zitationen: 11
Web of Science
Zitationen: 9
Zitationen: 11
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Institut für Mikrostrukturtechnik (IMT)
Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2050-7526, 2050-7534
KITopen-ID: 1000130442
HGF-Programm 38.01.05 (POF IV, LK 01) Simulations, Theory, Optics and Analytics (STOA)
Erschienen in Journal of materials chemistry / C
Verlag Royal Society of Chemistry (RSC)
Band 9
Heft 10
Seiten 3493-3503
Vorab online veröffentlicht am 27.01.2021
Nachgewiesen in Dimensions
Web of Science
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