颜色可调Sr3Y（BO3）3:Tm3+,Dy3+荧光粉的发光性能及能量传递

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

采用高温固相法制备了Sr3Y(BO3)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:Sr3Y(BO3)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Sr3Y(BO3)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。

Sr3Y(BO3)3∶xTm^3+,yDy^3+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∶xTm^3+phosphors emitted blue light under the excitation of 359 nm UV light and the Tm^3+concentration quenching point was x=0.08(n/n).In Sr3Y(BO3)3∶0.08Tm^3+,yDy^3+phosphors,with the Dy^3+doping concentration increasing,the Tm^3+luminescence intensity decreased;meanwhile,the Dy^3+luminescence intensity firstly increased and then decreased,and the critical quenching concentration of Dy^3+was y=0.1(n/n).The emitting color could be tuned by changing the doped Dy^3+concertration or the excitation wavelength.There is energy transfer between Tm^3+-Dy^3+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.