A ratiometric and lifetime-based luminescent thermometer exploiting the Co3+ luminescence in CaAl2O4:Co3+ and CaAl2O4:Co3+, Nd3+. Issue 24 (6th June 2022)

• Record Type: Journal Article
• Authors: Kniec, K.; Kochanowska, A.; Li, L.; Suta, M.; Marciniak, L.
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 24(2022)
• Page Start: 9278
• Page End: 9286
• Publication Date: 2022-06-06
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2tc00952h
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : The growing interest in luminescence thermometry and the desire to improve the thermometric properties of luminescent thermometers prompt the search for new solutions including new materials and types of luminescent ions. Abstract : The growing interest in luminescence thermometry and the desire to improve the thermometric properties of luminescent thermometers prompt the search for new solutions including new materials and types of luminescent ions. In this work, we present for the first time a systematic study verifying the application potential of materials doped with Co 3+ ions in luminescence thermometry. It was shown that the luminescence intensity of the emission band localized at 800 nm associated with a spin-forbidden 3 T1(g) (H) → 1 A1(g) (I) electronic transition of Co 3+ ions exhibits strong temperature quenching accompanied by a strong shortening of the lifetime of the 3 T1(g) (H) level upon temperature increase. This has enabled the development of a ratiometric luminescent thermometer in CaAl2 O4 :Co 3+, Nd 3+, particularly effective at temperatures around room temperature (250 K < T < 350 K). It is characterized by a relative sensitivity of S R of 1.86% K −1 at 263 K and a thermometer based on a luminescence lifetime of S R of 2.36% K −1 at 349 K. It is shown that changing the structure from hexagonal to monoclinic CaAl2 O4 does not change the spectral position of the emission band but increases the temperature quenching behavior of the Co 3+ luminescence.