高亮度LED用氯硅酸盐荧光粉的合成及光谱特性研究

Study on Synthesis and Spectral Properties of High Brightness LED Phosphors for Chloride Silicates

采用高温固相法合成了二价Eu^(2+)与Ln(Ln=Gd^(3+),Cu^+,Sm^(3+),Dy^(3+))共激活氯硅酸镁钙[Ca_8Mg(SiO_4)_4Cl_2:Eu^(2+),Ln]绿色荧光粉,借助X射线衍射对其晶格结构进行了研究,结果表明该荧光粉体具有面心立方晶系结构,实验条件下共激活离子Ln的掺杂对晶体的结构没有产生较大影响。并报道了它们的激发光谱及发射光谱,观测到氯硅酸镁钙中辅助激活离子Ln的掺杂并没有改变荧光粉体的光谱位置,只是在一定程度上提高了荧光粉体的相对发射强度。

Two valence Eu^2＋ and Ln （Ln=Gd^3＋, Cu^＋, Sm^3＋, Dy^3＋） were synthesized by a high temperature solid state reaction. The calcium magnesium silicate hydrate [CasMg（SiO4）4Cl2,： Eu^2＋ and Ln] green phosphors were co-activated. The structure of the lattice has been studied by means of X ray diffraction, which shows that the phosphor has a l;ace cubic crystal system structure. The activation of the co-doped ion Ln has no significant influence on the crystal structure under the experimental conditions. In addition, we reported the excitation spectra and emission spectra, spectral position observed Lo ion assisted activation of calcium magnesium chloride silicate did not change the fluorescence powder, but increase the relative emission intensity of the phosphor powder to a certain extent.