中文摘要：

采用高温固相法制备了Sr_（5-x）（PO_4）_2SiO_4：xEu~（2＋）（x=0.010,0.015,0.020,0.025,0.050,0.100）荧光粉,研究掺杂浓度和测试温度对荧光粉发光性能的影响。随着Eu~（2＋）掺杂浓度的增加,发射强度呈现先增大后减小的变化趋势,并在x=0.015时达到最大值。Eu~（2＋）掺杂浓度较低时（x≤0.025）,Eu~（2＋）取代不同格位的Sr~（2＋）,使得发射光谱具有双发射峰;当x〉0.025时,由于存在Eu 1到Eu 2的能量传递使发射光谱中Eu 1的峰位消失,只存在Eu 2的峰位。发射光谱随Eu~（2＋）浓度增大出现了红移现象,这是由于半径较小的Eu~（2＋）（0.109nm）取代较大的Sr~（2＋）（0.113nm）使得晶胞收缩,晶场强度增大,从而导致Eu~（2＋）的5d能级劈裂程度增大,电子跃迁释放能量降低。此外,测试温度增加时,发射光谱出现与Varshini方程不相符的蓝移现象,这是晶格结构稳定性和声子辅助隧穿效应共同作用使较小波长的Eu 1的发射居于主导地位的结果。

英文摘要：

Sr_（5-x）（PO_4）_2SiO_4：xEu~（~（2＋）） phosphors（x=0.010,0.015,0.020,0.025,0.050,0.100）were successfully synthesized via the solid-state reaction method.The influence of doping concentration and test temperature on luminescence properties is investigated in details.With the increase of doping concentration,the luminescence intensity increases.The maximum intensity is reached at x=0.015,and then it decreases.In a low concentration of Eu~（2＋）（x≤0.025）,two emission bands are observed because Eu~（2＋）can accupy two different crystallographic site in the crystal structure.When x0.025,there is only one emission band in the emission spectra,and it corresponds to the emission of Eu 2.This phenomenon may be caused by the energy transfer from Eu 1to Eu 2.The substitution of Eu~（2＋）（0.109nm）for the bigger Sr~（2＋）（0.113nm）leads to the shrinking of the unit cell,and then the crystal field enhances.The enhancement of crystal field results in the increase of the crystal field splitting of the 5dlevel of Eu~（2＋）ions,so the red shift is observed in the emission spectra.In addition,the emission wavelength shows a blue shift with increasing temperature,but the blue shift behavior cannot be described by the Varshini equation,it may be due to the stability of lattice structure and the phonon-assisted tunneling.