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Temperature-dependent luminescence of CaFCl:Yb,Er upconverting nanocrystals
Journal of Luminescence ( IF 3.6 ) Pub Date : 2021-02-22 , DOI: 10.1016/j.jlumin.2021.117974
B. Dulani Dhanapala , Hashini N. Munasinghe , Federico A. Rabuffetti

CaFCl:Yb,Er upconverting nanocrystals were synthesized via solution-phase thermolysis of metal trifluoroacetates and trichloroacetic acid and their temperature-dependent luminescence was probed in the 150–450 K range. Nanocrystals exhibited anisometric shape with average length and width equal to 90 and 76 nm, respectively, and an aspect ratio of 1.2. The solubility limits of ytterbium and erbium codoped in the CaFCl host were estimated to be ≈0.60 and 0.09 mol. %, respectively. Green emissions and luminescence decays from the 2H11/2 and 4S3/2 thermally coupled levels of Er3+ were analyzed from the perspective of using CaFCl:Yb,Er for optical temperature sensing. When operating as a ratiometric thermometer, a maximum temperature sensitivity of 3.4 × 10−2 K−1 was obtained at 150 K. Much lower sensitivities were computed when nanocrystals were used as a lifetime thermometer, with a maximum of 2.0 × 10−3 K−1 at 275 K. Analysis of luminescence decays revealed the presence of a single type of Er3+ activator. Radiative constants of the 2H11/2 and 4S3/2 levels and activation energy for thermal quenching of the latter were estimated.

更新日期:2021-03-12
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