Bi^(3＋)掺杂对Sr2MgSi2O7：Eu^(2＋)荧光粉的结构及发光性能的影响(英文)

Effects of Bi^(3+) Concentration on Luminescent Properties of Sr_2MgSi_2O_7:Eu^(2+) Phosphor

采用溶胶-凝胶法在还原气氛下制备了Sr2MgSi2O7∶Eu2+,xBi3+(x=0,0.02,0.04,0.06,0.08,0.1)荧光粉,并用XRD、TG-DTA及激发与发射谱仪对样品的结构及发光性能进行了表征。结果发现:单掺杂Bi3+的Sr2MgSi2O7样品的发射光谱所用的材料的激发光谱为一主峰为286 nm的宽带谱,这是由于激发态时Bi3+的3P1→1S0电子能级跃迁而造成的;单掺杂Eu2+的Sr2MgSi2O7样品的发射光谱所用的材料的激发光谱为一主峰为358 nm的宽带谱,这是典型的Eu2+的4f65d1→4f7跃迁而引起的。当Bi3+离子掺杂到Sr2MgSi2O7∶Eu2+样品的摩尔分数为0.04时,样品的发射强度是未掺杂Bi3+离子样品的1.9倍。

Blue luminescent Sr2MgSi2O7∶Eu^2＋,xBi^3＋（x=0,0.02,0.04,0.06,0.08,0.1） powder phosphors have been successfully synthesized by sol-gel method.Their structure and luminescent properties were analyzed by XRD,DTA-TG,and PL spectra.Emission spectra of Sr2MgSi2O7∶Bi^3＋ powder phosphors with λex=286 nm（3P1→1S0） and Sr2MgSi2O7∶Eu^2＋,xBi^3＋（x=0,0.02,0.04,0.06,0.08,0.1） phosphors with λex=358 nm（4f 6 5d1→4f7） have been analyzed.Based on the emission performance of Sr2MgSi2O7∶Eu^2＋,xBi3＋,the optimized Bi3＋ mole fraction is 0.04.The luminescent intensity of the phosphor increases up to 1.9 times than that of phosphors without doping Bi^3＋,which due to the sensitization of Bi^3＋ to Eu^2＋.