The photoluminescence of Pr doped (Bi0.5Na0.5)TiO3 ferroelectric ceramics prepared by conventional solid-state reaction were investigated. A bright red emission is observed at room temperature, which ascribed to 1D2→3H4 transition. The excitation bands are mainly located at 440 ∼ 505 nm, which is adaptable to the emission band of commercial blue light-emitting diodes (LEDs) chips. The optimal emission intensity was also obtained when Pr doping level was 0.003 mol. Meanwhile, the enhanced ferroelectric properties were obtained by Pr doping. The results show that Pr doped (Bi0.5Na0.5)TiO3 ceramics as a multifunctional material may be useful for white LEDs, sensor, and optical-electro integration.

The photoluminescence properties of Pr-doped K0.5Na0.5NbO3 (KNN) ceramics were prepared by the solid-state reaction method and investigated as a function of Pr concentration and sintering temperature. The excitation band ranging from 430 to 500 nm covers the emission wavelength of all commercial blue light-emitting diode chips. The photoluminescence spectra of KNN:Pr exhibit strong green (528 nm) and red (617 nm and 650 nm) emissions. The optimum doping concentration of Pr in KNN is 0.5 mol. %, and the optimized sintering temperature is 1170 °C. In addition to the admirable intrinsic piezoelectric properties of KNN, Pr-doped KNN may take an important role in many fields as a multifunctional material.

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