采用高温固相法合成Sr5MgLa2-x-y(BO3)6∶xBi 3+, yM (M=Eu 3+, Y 3+) (0≤x, y≤1)系列荧光粉。用扫描电镜和X射线粉末衍射仪测量样品的形貌和结构,用紫外可见分光光度计和荧光光谱仪测量样品的发光性能。结果表明:在该掺杂浓度范围内,样品为纯相;在波长为339 nm光的激发下,Sr5MgLa2-x(BO3)6∶xBi 3+具有峰值位于431 nm的单峰蓝光发射,为掺杂Bi 3+的 3P1→ 1S0跃迁,猝灭浓度为x=0.24;随着Y 3+浓度增大,Sr5MgLa1.76-y(BO3)6∶0.24Bi 3+, yY 3+荧光粉的发射峰强度增大,激发峰发生红移;在紫外光激发下,Sr5MgLa2-x-y(BO3)6∶xBi 3+, yEu 3+荧光粉存在Bi 3+的蓝光发射和Eu 3+的红光发射,存在Bi 3+到Eu 3+的能量传递,通过荧光衰减曲线可计算出能量传递效率。改变Sr5MgLa2-x-y(BO3)6∶xBi 3+, yEu 3+荧光粉中Bi 3+和Eu 3+的掺杂量或改变激发波长,均可得到可调节的蓝光到红光发射。

Herein, Sr₅MgLa_2-x-y(BO₃)₆∶xBi ³⁺, yM (M = Eu ³⁺, Y ³⁺) (0≤x, y ≤ 1) phosphors are synthesized using the high-temperature solid phase method. Further, scanning electron microscopy and X-ray powder diffractometer are utilized to characterize the morphology and structure of the samples, and an ultraviolet-visible spectrophotometer and a fluorescence spectroscope are utilized for characterizing the luminescent properties of the samples. The results denote that the samples are pure phase in terms of the doping concentration. Sr₅MgLa_2-x(BO₃)₆∶xBi ³⁺exhibits a single peak blue emission with a crest value of 431 nm under an excitation of 339 nm. This emission can be attributed to the transition of Bi ³⁺from ³P₁ to ¹S₀, and the quenching concentration is x=0.24. The Sr₅MgLa_1.76-y(BO₃)₆∶0.24Bi ³⁺, yY ³⁺ emission peak intensity intensifies with an increase in the Y ³⁺ concentration, and the excitation peaks denote a red shift. With the excitation of an ultraviolet light, the Sr₅MgLa_2-x-y(BO₃)₆∶xBi ³⁺, yEu ³⁺phosphor causes blue emission, which originates from Bi ³⁺, and red emission, which originates from Eu ³⁺. Further, there is an energy transfer process from Bi ³⁺ to Eu ³⁺, and the energy transfer efficiency can be calculated based on the fluorescence decay curve. Finally, an adjustable blue to red emission can be obtained by changing the doping amount of Bi ³⁺ and Eu ³⁺ in the Sr₅MgL a2-x-y(BO₃)₆∶xBi ³⁺, yEu ³⁺ phosphors or by changing the excitation wavelength.