发光颜色可调的白磷钙矿结构Ca_(8)MgBi(PO_(4))7∶Ce^(3+),Tb^(3+)荧光粉的制备、发光性能及能量传递

Preparation,luminescence properties,and energy transfer of color⁃tunable whitlockite⁃type Ca_(8)MgBi(PO_(4))_(7)∶Ce^(3+),Tb^(3+)phosphors

采用具有白磷钙矿结构的磷酸盐作为目标产物,通过高温固相法制备了发光颜色可调的Ca_(8)MgBi(PO_(4))7∶Ce^(3+),Tb^(3+)荧光粉。利用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)和荧光光谱等表征手段对其物相组成、微观形貌及发光性能进行了详细研究。结果表明:掺杂少量的Ce^(3+)、Tb^(3+)并没有改变Ca_(8)MgBi(PO_(4))7基质的晶体结构。荧光光谱和荧光寿命曲线确定了Ce^(3+)-Tb^(3+)之间存在能量传递,其能量传递机制为四极-四极相互作用,能量传递效率可达81%。固定Ce^(3+)浓度而逐渐增加Tb^(3+)的掺杂量时,系列Ca_(8)MgBi(PO_(4))7∶0.08Ce^(3+),yTb^(3+)荧光粉的发光颜色可由蓝光调至绿光,从而实现发光颜色的可控化。

A series of Ca_(8)MgBi(PO_(4))7∶Ce^(3+),Tb^(3+)phosphors with whitlockite-type structure and adjustable color were prepared by the high-temperature solid-phase method.The phase composition,microstructure,and luminescence properties were studied by X-ray powder diffraction(XRD),scanning electron microscope(SEM),and fluorescence spectroscopy.X-ray diffraction results confirmed doping a small amount of Ce^(3+)and Tb^(3+)did not change the crystal structure of the matrix.The energy transfer between Ce^(3+)-Tb^(3+)was confirmed by the fluorescence spectrum and fluorescence lifetime curve.The energy transfer mechanism was quadrupole-quadrupole interaction,and the energy transfer efficiency could reach 81%.The emission color of the series Ca_(8)MgBi(PO_(4))7∶0.08Ce^(3+),yTb^(3+)phosphors can be adjusted from blue light to green light by changing the doping concentrations of Tb^(3+),realizing the controllable emission color change.