Abstract:
A series of (Ba,Ca)
5(PO
4)
2SiO
4:Eu
2+ nanocrystalline phosphors were synthesized via a citrate sol-gel synthesis method. XRD, FE-SEM, and PL were exploited to characterize the crystal structure and luminescence properties of the prepared phosphors. The XRD results indicated that the pure Ba
5(PO
4)
2SiO
4 phase can be obtained at 900 ℃, and there is no crystal lattice perturbation induced by changing the doping the concentration ions Eu
2+ and relative ratio of Ba
2+ to Ca
2+. Under the excitation of ultraviolet light, the (Ba,Ca)
5(PO
4)
2SiO
4:Eu
2+ nanocrystalline phosphors consist of a broad band in the range of 400~550 nm due to the 4f
65d
1-4f
7(8S7/2) charge transfer transitions of Eu
2+ ions. The luminescence color of (Ba,Ca)
5(PO
4)
2SiO
4:Eu
2+ nanocrystalline phosphors can be tuned from deep blue to blue by changing the relative ratio of Ba
2+ to Ca
2+. High quality blue light emission can be achieved in the phosphor (Ba
0.99Ca
0.01)
5(PO
4)
2SiO
4:Eu
2+ by accurately adjusting the doping concentration of Eu
2+ ions. The obtained blue phosphor (Ba,Ca)
5(PO
4)
2SiO
4:Eu
2+ might be the promising candidates for UV-pumped white light-emitting devices and plant lighting.