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A highly sensitive ratiometric optical cryothermometer using a new broadband emitting trivalent bismuth singly activated BaZnSc(BO)microcrystal

Dalton Transactions, ISSN: 1477-9234, Vol: 50, Issue: 40, Page: 14342-14351
2021
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Motivated by the growing demand for noncontact temperature sensing in cryogenic environments, the development of a high performance low temperature optical thermometer has become more and more urgent. Herein, we demonstrate a new broadband emitting bismuth singly activated BaZnSc(BO)optical thermometric material that exhibits a remarkable temperature-dependent emission color variation and a good low temperature sensing performance. First, Bidoped BaZnSc(BO)phosphors were successfully synthesized by a high-temperature solid-state reaction. Upon excitation at 320 nm, the emission spectra of BaZnSc(BO):Bicover almost the entire visible region from 350 to 720 nm because of the multiple crystallographic sites occupied by Biions, which have been verified by structure analysis and time-resolved emission spectroscopy. Interestingly, the temperature dependent emission characteristics indicated that the thermal quenching phenomena of Biat different lattice sites were different, resulting in a very sensitive emission color variation from orange to cyan. Further analysis indicated that these Bidoped luminescent materials showed a good performance in temperature sensing over a wide temperature range from 10 to 374 K, with a maximum relative sensitivity of 3.076% Kat 210 K. Finally, this study provides a new perspective for the design of superior thermosensitive phosphors, aimed toward non-rare earth ion doped thermosensitive phosphors for optical cryothermometry applications.

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