Ratiometric thermometry using single Er3+-doped CaWO4phosphors

Ilya E Kolesnikov; Daria V Mamonova; Mikhail A Kurochkin; Vassily A Medvedev; Gongxun Bai; Evgenii Yu Kolesnikov

doi:10.1088/1361-6528/ac9a55

Ratiometric thermometry using single Er³⁺-doped CaWO₄phosphors

Nanotechnology. 2022 Nov 15;34(5). doi: 10.1088/1361-6528/ac9a55.

Authors

Ilya E Kolesnikov¹, Daria V Mamonova¹, Mikhail A Kurochkin¹, Vassily A Medvedev¹, Gongxun Bai², Evgenii Yu Kolesnikov³

Affiliations

¹ St. Petersburg State University, Universitetskaya nab. 7-9, 199034, St. Petersburg, Russia.
² Key Laboratory of Rare Earth Optoelectronic Materials and Devices of Zhejiang Province, China Jiliang University, Hangzhou 310018, People's Republic of China.
³ Peter the Great St. Petersburg Polytechnic University, Polytechnicheskaya str. 29, 195251, St. Petersburg, Russia.

PMID: 36240676
DOI: 10.1088/1361-6528/ac9a55

Abstract

Single doped CaWO₄:Er³⁺phosphors were synthesized and studied for application of optical thermal sensing within a wide range of 98-773 K. Ratiometric strategy utilizing two luminescence intensity ratios, one between host and Er³⁺band (LIR₁) and second between different Er³⁺transitions (LIR₂), results in self-referencing temperature readouts. The presence of two temperature-dependent parameters could improve thermometric characteristics and broaden the working temperature range compared to a usual single-parameter thermometer. Thermometric performances of prepared samples were evaluated in terms of thermal sensitivities, temperature resolution and repeatability. The highest sensitivity of 2.09% K^-1@300 K was found for LIR₁, whereas LIR₂provided more accurate thermal sensing with a temperature resolution of 0.06-0.1 K. Effect of Er³⁺doping concentration on sensing properties were studied. The presented findings indicate that CaWO₄:Er³⁺phosphors are perspective in dual-mode thermal sensing with high sensitivity and sub-degree resolution.

Keywords: Er3+; luminescence intensity ratio; optical thermometry; phosphors; thermal sensitivity.