Luminescence Intensity Ratio thermometry and Judd-Ofelt analysis of TiO2:Eu3+

Luminescence thermometry on europium doped TiO2 films, prepared by the plasma electrolytic oxidation, was investigated by the Luminescence Intensity Ratio method. The performance of the material for temperature sensing was tested from room temperature to 260 °C. The theoretical fit of the emission intensity ratio of Eu3+ 5D1→7F1 and 5D0→7F2 transitions revealed the energy difference between 5D1 and 5D0 levels of 1777 cm−1. Temperature sensitivity was calculated on the entire temperature range, with maximum value of 3.43 %K−1 at 293 K. The relationship between Judd-Ofelt and thermometric parameters was demonstrated, and further utilized for the calculation of the radiative transition probability, dipole strength and radiative lifetime of the 5D1 →7F1 transition. © 2018 Elsevier B.V