颜色可调Sr3Y（BO3）3∶Tm3+，Dy3+荧光粉的发光性能及能量传递

采用高温固相法制备了Sr_3Y(BO_3)_3:xTm~(3+),yDy~(3+)荧光粉,并通过XRD、SEM和荧光光谱仪对样品的物相、微观形貌、发光性能、能量传递机制和CIE色坐标进行了分析。结果表明:Sr_3Y(BO_3)_3:xTm~(3+)荧光粉在监测波长为359 nm时发射蓝光,Tm~(3+)的浓度淬灭点为x=0.08;在Sr_3Y(BO_3)_3:0.08Tm~(3+),yDy~(3+)荧光粉中,随着Dy~(3+)掺杂浓度的增加,Tm~(3+)的发光强度降低而Dy~(3+)发光强度却先增加后降低,Dy~(3+)的浓度淬灭点为y=0.1;通过改变Dy~(3+)掺杂浓度或改变激发光的波长,均可实现发射光的颜色可调;在Tm~(3+)-Dy~(3+)离子之间存在能量传递。当Dy~(3+)掺杂浓度(物质的量分数)为0.15时能量传递效率达75.14%,能量传递机制为电偶极-电偶极相互作用。

Luminescent Properities and Energy Transfer of Color Tunable Sr3Y(BO3)3: Tm3+,Dy3+ Phosphors

Sr₃Y(BO₃)₃:xTm³⁺,yDy³⁺ phosphors were prepared by high-temperature solid phase reaction. The phase structure, micromorphology, luminescence properties, energy transfer and CIE coordinates of the samples were investigated by XRD diffraction, SEM and fluorescence spectrophotometer. All results indicated that Sr₃Y(BO₃)₃:xTm³⁺ phosphors emitted blue light under the excitation of 359 nm UV light and the Tm³⁺ concentration quenching point was x=0.08(n/n). In Sr₃Y(BO₃)₃:0.08Tm³⁺,yDy³⁺ phosphors, with the Dy³⁺ doping concentration increasing, the Tm³⁺ luminescence intensity decreased; meanwhile, the Dy³⁺ luminescence intensity firstly increased and then decreased, and the critical quenching concentration of Dy³⁺ was y=0.1(n/n). The emitting color could be tuned by changing the doped Dy³⁺ concertration or the excitation wavelength. There is energy transfer between Tm³⁺-Dy³⁺ in the phosphors. When the doping concentration was y=0.15, the energy transfer efficiency was as high as 75.14%, and the energy transfer mechanism is electric dipole-dipole interaction.