A luminescence thermometer: temperature sensitive paint based on rare earth complexes and polymethyl methacrylate

Abstract

Well-defined probes based on rare earth complexes were prepared by using europium oxide (Eu₂O₃), gadolinium oxide (Gd₂O₃), 2-thenoyl trifluoroacetone (TTA), and 1,10-phenanthroline monohydrochloride monohydricrate (phen) as raw materials. Fluorescence spectroscopy was used to determine that 1:1 is the optimal ratio of Eu³⁺ and Gd³⁺. So a Eu_0.5Gd_0.5(TTA)₃phen/PMMA temperature sensitive paint was prepared composed of rare earth complexes Eu_0.5Gd_0.5(TTA)₃phen as probe molecules and polymethyl methacrylate (PMMA) as the matrix. The as-prepared Eu_0.5Gd_0.5(TTA)₃phen/PMMA exhibits a strong emission at 617 nm and has fine temperature quenching properties in the range of 20 °C–90 °C. Furthermore, the rate of change of luminescence and temperature sensitivity are enhanced due to doping of Gd³⁺, illustrating a synergistic effect between Gd³⁺ and Eu³⁺.

KEYWORDS:

• Rare earth ion
• temperature sensitive paint
• temperature quenching

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This research was funded by the Doctoral Scientific Research Foundation of Inner Mongolia Minzu University (BS397 and BS411).