Luminescent properties of red phosphors K2Ba(MoO4)2:Eu3+ for white light emitting diodes

K2Ba(MoO4)2:Eu3+phosphors were synthesized by solid-state reaction. The emission and excitation spectra of K2Ba(MoO4)2:Eu3+ phosphors exhibited that the phosphors could be effectively excited by near ultraviolet (394 nm) and blue (465 nm) light, and emitted red light at 616 nm. The influence of Eu3+concentration, sintering temperature and charge compensators (K+, Na+ or Li+) on the emission intensity were investigated. The results indicated that concentration quenching of Eu3+ was not observed within 30 mol.% Eu3+, 600 °C was a suitable sintering temperature for preparation of K2Ba(MoO4)2:Eu3+ phosphors, and K+ ions gave the best improvement to enhance the emission intensity. The CIE chromaticity coordinates of K2Ba(MoO4)2:0.05Eu3+ phosphor were calculated to be (0.68, 0.32), and color purity was 97.4%.