In this work, we demonstrate a potential thermometric material after systematic studies on the concentration/temperature-dependent spectroscopic properties of Pr3+ excited multiplets and of the Pr3+-Ti4+ intervalence charge transfer (IVCT) state in (La1-xPrx)2MgTiO6. The experimental results indicate that the electron population efficiency between the involved Pr3+ 4f multiplets is directly governed by multi-phonon relaxation (MPR) and cross relaxation (CR), and the IVCT state provides an additional contribution to the 1D2 luminescence. A schematic energy level diagram is proposed to illustrate the electron population pathway in Pr3+ doped La2MgTiO6. The observations clarify that the dramatic thermal-quenching of 3P0 luminescence is mainly induced by the electronic configuration crossover between the 3P0 multiplet and the IVCT state. On the other hand, the 1D2 luminescence possesses an excellent thermal stability in a large temperature region. These temperature sensing features of the Pr3+ doped La2MgTiO6 material indicate its potential application in optical thermometric techniques.
|Number of pages||9|
|Journal||Journal of Materials Chemistry C: materials for optical and electronic devices|
|Publication status||Published - 2017|