Eu^(2+)激活的Ba_(5-x)Sr_x(PO_4)_3 Cl的发光性质

Investigation of Spectroscopic Properties in Eu^(2+) Activated Ba_(5-x)Sr_x(PO_4)_3Cl

采用高温固相法合成了Eu^(2+)激活的Ba_(5-a)Sr_x(PO_4)_3Cl(x=0,1,2,3,4,5)蓝色发光粉。样品的XRD衍射光谱表明,随着Ba^(2+)浓度的增加,衍射峰向小角度方向移动。所有样品的激发光谱都存在两个激发峰,随着Ba^(2+)浓度的增加,两个尖峰逐渐靠近,同时激发峰强度降低,这种现象可以通过位形坐标解释。激发和发射光谱及发射光谱色坐标数据表明,Eu^(2+)掺杂的Ba_3Sr_2(PO_4)

Eu（2＋）doped Ba_（5-x）Sr_x（PO_4）_3Cl（x=0,1,2,3,4,5）blue phosphors particle were prepared by the conventional solid-state reaction method.It can be clearly exhibited that XRD peaks of the samples shift to the smaller angle side with the increasing content of Ba^（2＋）.In excitation spectra,two peaks fell toward each other of all the samples and their intensities decreased with increasing content of Ba^（2＋）,which can be explained by the configuration-coordinate model.Seen from the emission spectra,the position of the emission peaks did not change with the excitation wavelengths,which indicated that two emission peaks did not come from two different sites of Eu^（2＋）ions.It can be attributed to two Stark levels of 4f^6 5d^1 configuration.The broader emission bands can be attributed to the increase of inhomogeneous line width from changed crystal field by introducing Ba^（2＋）ions.The excitation and emission spectra show that Eu^（2＋）doped Ba_3Sr_2（PO_4）_3Cl is a promising blue phosphor for ultraviolet light emitting diode（LED）.