Effect of charge compensators A+ (A+ = Li, Na and K) on photoluminescence properties of Ba2Ca(PO4)2:Eu3+ phosphor for solid state lighting

The Ba2Ca(PO4)(2):Eu3+ phosphors that were co-doped in the alkali metal ions A(+) (A(+) = Li, Na and K) to improve their luminescence property were synthesized by wet chemical method. X-ray diffraction confirmed the phase formation. When excited at 394 nm wavelength, the Ba2Ca(PO4)(2):Eu3+ phosphor showed an emission peak at 591 and 615 nm. The intensity of the Ba2Ca(PO4)(2):Eu3+ phosphor emission could reach a maximum of 0.5 mol % and then concentration quenching occurs. The emission intensity can be increased by introducing compensator charge A(+) (A(+) = Li, Na and K) into the Ba2Ca(PO4)(2):Eu3+ phosphor. In contrast, all three charge compensators may improve luminescence emission intensity, among these charge compensating ions Li+ being the most effective. The chromaticity coordinates of the Ba2Ca(PO4)(2):Eu3+, Li+ phosphor were (x = 0.680, y = 0.319) according to the CIE. The findings indicate that Ba2Ca(PO4)(2):Eu3+, A(+) (A(+) = Li, Na and K) phosphors with excellent photoluminescence properties will be used as a component in near-ultraviolet exciting solid state lighting.