Single doped CaWO:Erphosphors 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 Erband (LIR) and second between different Ertransitions (LIR), 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@300 K was found for LIR, whereas LIRprovided more accurate thermal sensing with a temperature resolution of 0.06-0.1 K. Effect of Erdoping concentration on sensing properties were studied. The presented findings indicate that CaWO:Erphosphors are perspective in dual-mode thermal sensing with high sensitivity and sub-degree resolution.
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