铈铕掺杂氯硅酸镁钙体系的相对光谱功率分布与色坐标定位

Relative Spectral Power Distribution and Emission Color Coordinates of Ce^(3+) and Eu^(2+) Doped Calcium Magnesium Chlorosilicate System

采用高温固相反应法合成铈铕掺杂氯硅酸镁钙系列粉体,利用X射线衍射(XRD)对晶体结构加以鉴定,并对其荧光光谱进行了测试和分析。通过光谱功率校准曲线,推演出样品的相对光谱功率分布,进而对粉体发光色坐标进行计算和表征。实验结果表明,合成粉体为面心立方晶体Ca8Mg(SiO4)4Cl2,铈铕单掺氯硅酸镁钙样品在紫外光激发下分别发出蓝紫光和绿光,对应色坐标为(0.1573,0.0528)和(0.1540,0.4663)。在铈铕共掺杂体系中,Ce3+的加入使样品发光颜色发生明显改变,随着Ce3+浓度的增大而进入蓝绿区。

A series of Ce3＋ and Eu2＋ doped Ca8Mg（SiO4）4Cl2 powder were synthesized by high-temperature solid-state reaction.The crystal structure was investigated by X-ray diffraction（XRD） and the fluorescence spectra were also recorded and analyzed.The relative spectral power distribution was obtained by spectral power calibration curve,and the emission color coordinates of samples were calculated and characterized.The XRD spectrum indicate that the phosphor is Ca8Mg（SiO4）4Cl2 with face centered cubic lattice.Ce3＋ and Eu2＋ doped Ca8Mg（SiO4）4Cl2 samples present purplish-blue and green colors under the excitation of ultraviolet radiation,and the corresponding color coordinates are（0.157 3,0.052 8） and（0.154 0,0.466 3）,respectively.In Ce3＋/Eu2＋ codoped Ca8Mg（SiO4）4Cl2 powder,the introduction of Ce3＋ changes the luminescent color obviously,and with the increasing of concentration Ce3＋,the color coordinates shift to the greenish blue color region.