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Ratiometric Luminescent Thermometry with Excellent Sensitivity over a Broad Temperature Range Utilizing Thermally‐Assisted and Multiphoton Upconversion in Triply‐Doped La₂O₃:Yb³⁺/Er³⁺/Nd³⁺

Gao, Guojun 1; Busko, Dmitry 1; Katumo, Ngei 1; Joseph, Reetu 1; Madirov, Eduard 1; Turshatov, Andrey 1; Howard, Ian A. 1,2; Richards, Bryce S. ORCID iD icon 1,2
1 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)
2 Lichttechnisches Institut (LTI), Karlsruher Institut für Technologie (KIT)

A ratiometric optical thermometer based on triply‐doped La$_{2}$O$_{3}$:Yb$^{3+}$/Er$^{3+}$/Nd$^{3+}$ microcrystals is reported with a relative sensitivity above 1% K$^{-1}$ in the entire range from 300–700 K, and is between 1.8–0.7% K$^{-1}$ over the range 290–833 K. The 825 nm upconversion (UC) emission from the Nd$^{3+ 4}$F$_{5/2}$ level relies on thermally‐assisted energy transfer from Yb$^{3+}$; thus, unusually, the near‐infrared emission increases with increasing temperature in the relevant range. More typically, the two‐photon 660 nm UC from Er$^{3+ 4}$F$_{9/2}$ level decreases in intensity with increasing temperature due to increasing non‐radiative rates. The variation of fluorescent intensity ratio between these emissions is amplified by their opposite responses to temperature change leading to excellent sensitivity. Concurrently, the different pathways for the temperature response in the two emitting ions enable the high sensitivity to be maintained over an atypically broad temperature range. The wide separation in wavelength means that a standard silicon‐based monochrome camera with broad (inexpensive) band pass filters is sufficient to use this phosphor for thermography. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000128072
Veröffentlicht am 05.01.2021
DOI: 10.1002/adom.202001901
Zitationen: 6
Web of Science
Zitationen: 4
Zitationen: 8
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 04.03.2021
Sprache Englisch
Identifikator ISSN: 2195-1071, 2195-1071
KITopen-ID: 1000128072
HGF-Programm 38.01.05 (POF IV, LK 01) Simulations, Theory, Optics and Analytics (STOA)
Erschienen in Advanced optical materials
Verlag John Wiley and Sons
Band 9
Heft 5
Seiten Art.-Nr.: 2001901
Nachgewiesen in Web of Science
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