Photoluminescent and Dielectric Characterizations of Pr Doped CaBi_2Nb_2O_9 Multifunctional Ferroelectrics

摘要

We examine the Pr~(3+) doped CaBi_2Nb_2O_9 (CBNO) bismuth layered ferroelectrics and demonstrate that a certain amount of Pr~(3+) doped ceramic sample shows a red photoluminescence with blue and ultraviolet excitation at room temperature. The blue excitation attributes to the f-f transitions from the ~3H_4 ground state to the ~3P_J (J = 0,1,2) excited states of Pr~(3+) and the ultraviolet excitation is associated with the electronic transition within the host solid respectively. The red emission is ascribed to ~1D_2→~3H_4 transition. The excitation of the blue wavelength region covers the emission wavelength of the commercial blue LED chips;;meaning that Pr doped CBNO could be used for white LEDs. At the same time, CBNO is an intrinsic ferroelectric and piezoelectric material. Pr doped CBNO would be useful in multifunctional sensor, future electrical-optical integration and coupling devices.