碱土金属离子(Mg^(2+),Ca^(2+),Ba^(2+))掺杂对长余辉荧光粉SrAl_2O_4:Eu^(2+),Dy^(3+)发光性能的影响

Influence of Alkaline Earth Elements(Mg^(2+),Ca^(2+),Ba^(2+)) to Luminescent Properties of Long Persistent Phosphors SrAl_2O_4:Eu^(2+),Dy^(3+)

采用高温固相法制备了碱土金属离子(Mg2+,Ca2+,Ba2+)掺杂的SrAl2O4∶Eu2+,Dy3+长余辉荧光粉。XRD谱分析表明,随着基质中掺入的碱土金属离子(Mg2+,Ca2+,Ba2+)浓度增加,基质晶格常数也随之发生变化。Mg2+,Ca2+和Ba2+3种碱土离子在SrAl2O4中的固溶范围分别为40%,15%和30%。光谱分析则表明在固溶范围内随着掺杂Mg2+,Ca2+和Ba2+浓度的增大,样品的发射峰值会在480~530 nm范围出现规律性移动。适当浓度的Mg2+,Ba2+掺杂会不同程度地提高样品的发光强度,而Ca2+的掺杂则会降低发光强度。但是碱土金属离子(Mg2+,Ca2+,Ba2+)的掺杂并不能延长SrAl2O4∶Eu2+,Dy3+荧光粉的余辉时间。

Alkaline earth elements （Mg^2 ＋ , Ca^2 ＋, Ba^2 ＋） doped SrA1204 ： Eu^2 ＋, Dy^3 ＋ long persistent phosphors were prepared by solid state reaction. XRD patterns showed that the lattice parameter of host materials SrAl2O4 varied with the alkaline earth elements （Mg^2 ＋ , Ca^2 ＋ , Ba^2 ＋ ） contents. The limits of solid so- lution of the three doped systems were 40%, 15% and 30%, respectively. The emission spectra showed that the tuning range of the phosphors was between480 - 530 nm, which was determined by doping contents. The luminescent intensities of the doped samples were found to be related to the kind and contents of doping elements. Replacement of Sr^2 ＋ by Mg^2 ＋ and Ba^2 ＋ increased the luminescent intensity, whereas Ca^2 ＋ decreased the luminescent intensity. But alkaline earth elements （Mg^2 ＋ , Ca^2 ＋ , Ba^2 ＋ ） could not prolong the afterglow.