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The use of energy looping between Tm3+ and Er3+ ions to obtain an intense upconversion under the 1208 nm radiation and its use in temperature sensing

Grzyb, Tomasz; Martín, Inocencio R.; Popescu, Radian 1
1 Laboratorium für Elektronenmikroskopie (LEM), Karlsruher Institut für Technologie (KIT)

Abstract:

The upconversion phenomenon allows for the emission of nanoparticles (NPs) under excitation with near-infrared (NIR) light. Such property is demanded in biology and medicine to detect or treat diseases such as tumours. The transparency of biological systems for NIR light is limited to three spectral ranges, called biological windows. However, the most frequently used excitation laser to obtain upconversion is out of these ranges, with a wavelength of around 975 nm. In this article, we show an alternative – Tm3+/Er3+-doped NPs that can convert 1208 nm excitation radiation, which is in the range of the 2nd biological window, to visible light within the 1st biological window. The spectroscopic properties of the core@shell NaYF4:Tm3+@NaYF4 and NaYF4:Er3+,Tm3+@NaYF4 NPs revealed a complex mechanism responsible for the observed upconversion. To explain emission in the studied NPs, we propose an energy looping mechanism: a sequence of ground state absorption, energy transfers and cross-relaxation (CR) processes between Tm3+ ions. Next, the excited Tm3+ ions transfer the absorbed energy to Er3+ ions, which results in green, red and NIR emission at 526, 546, 660, 698, 802 and 982 nm. ... mehr

Zugehörige Institution(en) am KIT Laboratorium für Elektronenmikroskopie (LEM)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 25.01.2024
Sprache Englisch
Identifikator ISSN: 2040-3364, 2040-3372
KITopen-ID: 1000167165
Erschienen in Nanoscale
Verlag Royal Society of Chemistry (RSC)
Band 16
Heft 4
Seiten 1692–1702
Vorab online veröffentlicht am 22.12.2023
Nachgewiesen in OpenAlex
Web of Science
Dimensions
Scopus
Globale Ziele für nachhaltige Entwicklung Ziel 7 – Bezahlbare und saubere Energie

Verlagsausgabe §
DOI: 10.5445/IR/1000167165
Veröffentlicht am 10.01.2024
Originalveröffentlichung
DOI: 10.1039/d3nr04418a
Scopus
Zitationen: 10
Web of Science
Zitationen: 9
Dimensions
Zitationen: 11
Seitenaufrufe: 38
seit 10.01.2024
Downloads: 21
seit 13.01.2024
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