Synthesis and photoluminescence characteristics of color-tunable BaY2ZnO5:Eu3+ phosphors

Color-tunable phosphors of BaY2-xEuxZnO5 (x=0.001-0.9) were synthesized using a vibrating milled solid state reaction. The results indicate that the emission spectra of BaY2-xEuxZnO5 samples excited at 395 nm exhibit a series of shaped peaks assigned to the D-5(0)-> F-7(J) (J=0,1,2,3,4) transitions. Luminescence from the higher excited states, such as D-5(1), D-5(2), and D-5(3), were also observed even though the Eu3+ concentration was up to x=0.2. The chromaticity coordinate of BaY2-xEuxZnO5 phosphors varies with the Eu3+-doped concentrations from blue, white, to red, and which may be potentially applicable as a white light emitting phosphor for ultraviolet light emitting diodes.