• Abram, Christopher
• Betke, Ulf
• Rashed, Arwa
• Dalipi, Linda
• Fond, Benoit
• Elashry, Mohamed

Abstract

<jats:p>If the temperature-sensitive range of luminescent thermometers could be continuously adjusted by the material properties, a sensor material could be selected to finely resolve key thermal phenomena occurring around specific temperatures, such as the physiological temperature or the boiling points of certain substances. In this study, solid solutions of YVO4 and ScVO4 doped with bismuth are synthesised to explore the impact of the solution composition on the phosphor luminescence properties, in particular the temperature dependence of the luminescence decay time. Substituting Sc3+ ions with the slightly larger Y3+ ions causes a continuous shift in the decay time temperature sensitivity towards higher temperatures. Using X-ray diffraction measurements, a relationship between the thermal quenching temperature and the Bi3+-V5+ interatomic distance is proposed. This paper introduces a systematic framework for tunable decay time luminescence thermometers with a peak sensitivity above 2.2%/°C at a temperature that can be adjusted anywhere between -15°C and 220°C. Owing to their microsecond decay time, the luminescence emission of these phosphors can be detected using cameras with short interframe times for temperature imaging of fast temperature transients with a precision below 1°C.</jats:p>

Topics

• impedance spectroscopy
• x-ray diffraction
• quenching
• Bismuth
• luminescence