Effect of rare earth ion on fluorescent properties of Eu(TTA)3phen/PMMA temperature sensitive paint

The temperature sensitive paint (TSP) technology is widely used in the temperature distribution measurement of large area solid field, especially for the in-depth research in the mechanical behavior of complex flow gas around the aircraft, because of its advantages of non-contact, full-field measurement, easy manufacture and use. In this work, we synthesized the rare earth ion(Y3+, Er3+) doped Eu(TTA)3phen/PMMA temperature sensitive paint respectively based on the probe molecules of the rare earth ion (Y3+, Er3+) doped Eu(TTA)3phen and polymethyl methacrylate(PMMA). The structure of probe molecules and the fluorescent properties of TSP were also studied. The result show that the optimal ratio of Eu3+:Y3+ (or Er3+) is 0.5:0.5, rare earth ions are coordinated with ligands and the doping of Y3+ and Er3+ do not affect the structure of Eu(TTA)3phen. Y3+ and Er3+ have gain effect on the fluorescent emission of Eu(TTA)3phen/PMMA and the strongest fluorescent intensity (616 nm) is decreased with the increasing of temperature, which show that the Y3+ and Er3+ doped Eu (TTA)3phen/PMMA have temperature quenching properties in the temperature range of 20–80 °C. What’s more, the doping of Y3+ and Er3+ can improve the change rate of the fluorescent intensity and the temperature measurement sensitivity.