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Synthesis and the luminescent properties of Ba2ZnS3:Ba2ZnS3:Ce,Ag phosphors

Ba 2 ZnS 3 :Ce,Ag phosphors, emitting bluish to yellowish-green light, were synthesized by a double-crucible method. X-ray diffraction results indicate that the raw materials were completely sulfurized at 1000°C for 2 h, and all samples had a orthorhombic crystal structure with doping 0.1-1 mol % Ce 3 + and codoping 0-0.2 mol % Ag + . The emission spectra resulted from (i) host-activator transition and (ii) 2 D(5d)- 7 F 5 / 2 (4f) and 2 D(5d)- 7 F 7 / 2 (4f)Ce 3 + transitions. The photoluminescence spectra show that the emission peaks in the 494-508 nm range (excited at λ e x c = 420 nm) and in the 493-537 nm range (excited around λ e x c = 356 nm), like the CIE color coordinate, depend on the doping concentration of the Ce 3 + and Ag + ions.