Preparation Of BaO-B₂O₃-based Phosphors Doped With Rare Earth Ions And Their Luminescence Properties

White LED is regarded as a new generation of lighting source after fluorescent lamp and incandescent lamp because it has the advantages of high luminous efficiency,small size,low energy consumption and environmental-friendly materials.Among them,the advantages and disadvantages of phosphor powder will directly affect the performance of white LED.In this paper,the phosphor doped with rare earth ions Eu³⁺and Tb³⁺are prepared by high temperature solid phase method using Ba O-B₂O₃(Ba₂B₂O₅and Ba₂B₁₀O₁₇)as the matrix.The main research results are as follows:（1）The phosphor Ba₂B₂O₅:Eu³⁺are prepared at 900℃of calcining temperature and 8%（mol）Eu³⁺doping concentrations.The Ba₂B₂O₅:Eu³⁺phosphor can be effectively excited by UV radiation at 394nm.In its emission spectrum,the stronger peaks at 596nm and 618nm are ascribed to the magnetic dipole ⁵D₀→⁷F₁transition and electric dipole ⁵D₀→⁷F₂transition of Eu³⁺. （2）The phosphor Ba₂B₂O₅:Eu³⁺ are prepared at 850℃ of calcining temperature and 8%（mol）Tb³⁺doping concentrations.The Ba₂B₂O₅:Eu³⁺phosphor can be effectively excited by UV radiation at 236nm.In its emission spectrum,the stronger peaks at 547nm is ascribed to ⁵D₄→⁷F₅transition emission of Tb³⁺.It shows a better green emission.（3）The phosphor Ba₂B₂O₅:5%Eu³⁺,x Tb³⁺are prepared at 850℃of calcining temperatureand8%（mol）Tb³⁺dopingconcentrations.The Ba₂B₂O₅:5%Eu³⁺,x Tb³⁺phosphor can be effectively excited by UV radiation at236nm.In its emission spectrum,the stronger peaks at 547nm,596nm and 617nm are the characteristic emission peaks of Tb³⁺and Eu³⁺respectively.By changing the doping concentration of Tb³⁺in the Ba₂B₂O₅system,the emission color of Ba₂B₂O₅:Eu³⁺,Tb³⁺phosphors can be changed from green to yellow-green to blue-green.（4）The phosphor Ba₂B₁₀O₁₇:Eu³⁺are prepared at 850℃of calcining temperature and 8%（mol）Eu³⁺doping concentrations.The Ba₂B₁₀O₁₇:Eu³⁺phosphor can be effectively excited by UV radiation at 394nm.In its emission spectrum,the stronger peaks at 596nm and 618nm are ascribed to the magnetic dipole ⁵D₀→⁷F₁transition and electric dipole ⁵D₀→⁷F₂transition of Eu³⁺.（5）The phosphor Ba₂B₁₀O₁₇:Eu³⁺ are prepared at 850℃ of calcining temperature and 5%（mol）Tb³⁺doping concentrations.The Ba₂B₁₀O₁₇:Eu³⁺phosphor can be effectively excited by UV radiation at 222nm.In its emission spectrum,the stronger peaks at 547nm is ascribed to ⁵D₄→⁷F₅transition emission of Tb³⁺.It shows a better green emission.（6）The phosphor Ba₂B₁₀O₁₇:5%Eu³⁺,x Tb³⁺are prepared at 850℃of calcining temperatureand8%（mol）Tb³⁺dopingconcentrations.The Ba₂B₁₀O₁₇:5%Eu³⁺,x Tb³⁺phosphor can be effectively excited by UV radiation at208nm.In its emission spectrum,the stronger peaks at 547nm,596nm and 617nm are the characteristic emission peaks of Tb³⁺and Eu³⁺respectively.By changing the doping concentration of Tb³⁺in the Ba₂B₁₀O₁₇system,the emission color of Ba₂B₁₀O₁₇:Eu³⁺,Tb³⁺phosphors can be changed from green to pale yellow.Tb³⁺are successfully prepared,which can provide references for improving and developing of phosphors.