Blue excited photoluminescence of Pr doped CaBi2Ta2O9 based ferroelectrics

Pr3+ doped CaBi2Ta2O9 based bismuth layered-structure oxides were synthesized by a simple solid state reaction method. The photoluminescence properties of the samples were investigated by excitation and emission spectra. Photoluminescence excitation spectra show that the samples have broad blue excitation band located at 430–510 nm, which covers the emission wavelength of commercial blue light-emitting diode (LED) chips. Upon the excitation of 450 nm light, a novel red emission centered at 621 nm of Pr doped CaBi2Ta2O9 makes it useful in the white LEDs. In addition, it was also found that the photoluminescence can been improved by partial substituting Sr for Ca. These Pr3+ doped CaBi2Ta2O9 based ferroelectrics could possibly be used as a multifunctional material for a wide range of applications, such as integrated electro-optical devices.

► Photoluminescence excitation spectra shows that the Pr doped CaBi2Ta2O9 based ferroelectrics have broad blue excitation band.
► Upon the excitation of blue light, the samples exhibits a strong emission peak centered at 621 nm at room temperature.
► The photoluminescence of the samples can be improved by partial substituting Sr for Ca.