Preparation and optical properties of BaZnOS:Bi3+ phosphor
A series of blue-green BaZnOS phosphors doped with bismuth(Bi)was synthesized by a high temperature solid-state method using barium carbonate,zinc sulfide and bismuth oxide as raw materials.The correlation between site occupation,unit cell change and luminescence properties of Bi in BaZnOS was studied.In BaZnOS,according to the principle of the same ion coordination and similar radius,Ba is the most suitable and stable site for Bi to occupy.Because the radius of Bi3+ is slightly smaller than that of Ba2+,the unit cell parameters after doping are reduced.Under the ultraviolet light excitation of 372 nm,both BaZnOS and BaZnOS:Bi3+ phosphors showed very wide emission bands at 400-600 nm.The luminescence of undoped BaZnOS is attributed to the oxygen vacancy defects in the synthesis process,and after doping with Bi3+,Bi3+ can be combined into the lattice of BaZnOS.Due to the 3P1,0→1S0 transition of Bi3+,the photoluminescence is further enhanced by about 2-3 times at 400-600 nm.Calculation of chromaticity coordinates showed that the chromaticity coordinates of prepared BaZnOS:Bi3+ phosphors are all located in the blue-green region,and the BaZnOS:Bi3+ phosphors can be used as potential phosphors to emit white light in coordination with red light,and they can be used in the field of white light-emitting diodes.
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