Characteristic evaluation of chameleon luminophore dispersed in polymer

A temperature-sensitive paint (TSP) using a chameleon luminophore [Tb_0.99Eu_0.01 (hfa)₃ (dpbp)]_n is proposed. The chameleon luminophore was dispersed in isobutyl methacrylate polymer in a toluene solvent to fix it on a sample coupon. Temperature and pressure sensitivities of the chameleon luminophore-based TSP were measured using a spectrofluorophotometer. The emission for each wavelength was confirmed to be dependent on the temperature and pressure. The temperature and pressure sensitivities of the TSP were 0.81–2.8%/K and 0.08–0.12%/kPa, respectively. Higher temperature sensitivity can be obtained using the ratio of emissions from the two lanthanide ions, Tb^III and Eu^III . The temperature sensitivity when using the ratio of the emission intensities at 616 nm derived from Eu^III and at 545 nm derived from Tb^III was 3.2%/K, which was the highest value in the present study. In addition, the pressure sensitivity for the case using the ratio of the emission intensities at 616 and 545 nm was 4.8 × 10⁻²%/kPa. Higher temperature sensitivity and lower pressure sensitivity than that with a single wavelength can be achieved using the ratio of the emission intensities at the two peak wavelengths derived from Tb^III and Eu^III .