新型磷灰石结构Ca_(8)Gd_(2)(BO_(4))(PO_(4))_(5)O:Ce^(3+)荧光粉的合成及发光性能研究

Synthesis and Luminescence Properties of New Type Apatite Structure Ca_(8)Gd_(2)(BO_(4))(PO;);O:Ce^(3+) Phosphor

采用高温固相法制备了磷灰石结构的Ca_(8)Gd_(2)(BO_(4))(PO_(4))_(5)O∶Ce^(3+)荧光粉。X射线粉末衍射结果表明所合成的荧光粉为磷灰石相。系统研究了其发光性质,漫反射光谱表明该样品在200~400 nm波段中存在着较宽的吸收带,通过Kubelka-Munk方程估算了Ca_(8)Gd_(2)(BO_(4))(PO_(4))_(5)O∶Ce^(3+)样品的光学带隙值大约为3.7 eV。监测波长为468 nm时,激发光谱在232 nm处存在着较强的激发峰,归因于Ce^(3+)在此处发生4f-5d的能级跃迁。在232 nm波长激发下,发射光谱的最强发射峰位于468 nm处,归因于Ce^(3+)在此处发生5d-4f的能级跃迁。当Ce^(3+)的掺杂浓度超过1.0 mol%时,发生了浓度淬灭现象。CIE色度坐标显示该样品位于蓝光区域。结果表明,Ca_(8)Gd_(2)(BO_(4))(PO_(4))_(5)O∶Ce^(3+)荧光粉为一种可被紫外光激发的新型磷灰石结构蓝色荧光粉。

Ca_(8)Gd_(2)(BO_(4))(PO;);O∶ Ce^(3+) phosphor with apatite structure was prepared by high temperature solid phase method. X-ray powder diffraction results show that the synthesized phosphor was in apatite phase. The luminescence properties have been systematically studied, and the diffuse reflectance spectrum shows that the sample has a broad absorption band in the 200-400 nm band and the optical band gap value of Ca_(8)Gd_(2)(BO_(4))(PO;);O∶ Ce^(3+) samples were estimated to be about 3.7 eV by Kubelka-Munk equation.When the monitoring wavelength is 468 nm, the excitation spectrum has a strong excitation peak at 232 nm, which was attributed to the 4f-5d energy level transition of Ce^(3+). Under the excitation of 232 nm wavelength, the strongest emission peak of the emission spectrum was located at 468 nm, which was attributed to the 5d-4f energy level transition of Ce^(3+). When the doping concentration of Ce^(3+) exceeds 1.0 mol%, concentration quenching occurs. The CIE chromaticity coordinates show that the sample was located in the blue region. The results show that Ca_(8)Gd_(2)(BO_(4))(PO;);O∶ Ce^(3+) phosphor is a new type of blue phosphor with apatite structure that can be excited by ultraviolet light.