Barium molybdate white emitting phosphor synthesized at room temperature by co-precipitation.

ABSTRACT

Crystalline BaMoO4Dy3+ and BaMoO4Sm3+ phosphors were synthesized by co-precipitation at room temperature. The main peak (112) phase and tetragonal structure were confirmed using X-ray diffraction analysis. The lattice constant and Raman signal on d (112) were changed by the rare earth doping. A strong absorption wavelength appeared in the UV region, and BaMoO4Dy3+ excited with UV wavelength showed a yellow spectrum. BaMoO4Sm3+ showed a reddish orange spectrum. BaMoO4[Sm3+]/[Dy3+] was synthesized for use as a white light phosphor, and the change in the emission characteristics of yellow, white, and reddish orange could be observed depending on the doping concentration of Sm3+ ions. The synthesized phosphor powder and PDMS polymer were mixed to form a flexible composite, and when applied on a UV-LED chip, the same color as the powder was realized, suggesting its use as an LED color filter.