Solid State Synthesis And Luminescence Properties Of Rare Earth Doped Li2_NaBP₂O₈

White LED devices have attracted wide attention because of their excellent photoelectric controllability,long life,energy saving and high efficiency.Rare earth doped phosphor materials,as an important part of white LED devices are the research hotspot in materials and related industries.Borophosphate materials with abundant crystal structure,mild synthetic condition and good stability can be used as phosphor matrix.Li2NaBP2O8:Eu3+,Pr3+,Dy3+,Sm3+,Tb3+,Ce3+ phosphors were prepared by high temperature solid-state method.Li2NaBP2O8:RE3+(RE3+ Eu3+,Pr3+,Sm3+)phosphors can be used as potential red luminescent materials.Li2NaBP2O8:RE3+(RE3+= Eu3+,Sm3+)phosphors can be excited by near-ultraviolet chips in white LED devices.Li2NaBP2O8:Pr3+ phosphors can be excited by blue chips in white LED devices.When the excitation wavelength is 393 nm,Li2NaBP2O8:Eu3+ has the strongest emission at 593 nm.The sample emits orange red light,and the optimum doping concentration is 0.04 mol.Li2NaBP2O8:Pr3+phosphors emit red light under 452 nm excitation,the strongest emission peak is located at 673 nm and the optimum doping concentration is 0.01 mol.The emission peaks of Li2NaBP2O8:Sm3+ phosphors are 561,597 and 642 nm,respectively,under the excitation of 400 nm wavelength light source.The optimum doping concentration of Sm3+ ions is 0.02 mol.Li2NaBP2O8:Dy3+ white phosphor can be excited by a wide ultraviolet wavelength range.Under the excitation of 351 nm ultraviolet light source,Li2NaBP2O8:Dy3+phosphor exhibits bright white light emission.The optimum doping concentration of Dy3+ion is 0.01 mol.Single-phase white light output can be realized and applied in white LED devices.L12NaBP2O8:Tb3+ green phosphor was used to obtain blue and green emission with adjustable light color as excitation source at 372 nm wavelength.The strongest emission peak is 544 nm(5D4?7F5),and the optimum doping concentration of Tb3+ is 0.03 mol.The results show that Li2NaBP2O8:Tb3+ phosphor can be applied to ultraviolet chip-based white LED devices.Li2NaBP2O8:Ce3+ phosphor exhibit an ultraviolet emission band peaking at 318 nn under 282 nm excitation,and the optimum doping concentration of 0.02 mol.