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

Abstract

Crystalline BaMoO₄:Dy³⁺ and BaMoO₄:Sm³⁺ 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 BaMoO₄:Dy³⁺ excited with UV wavelength showed a yellow spectrum. BaMoO₄:Sm³⁺ 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.