【摘要】 采用高温固相法在N2-H2还原气氛下合成了一系列Sr3(PO4)2∶Eu2+蓝色荧光粉,通过X射线衍射仪(XRD)、荧光光谱仪(PL)对荧光粉的晶体结构、激发和发射光谱进行了表征。结果表明:微量的Eu2+掺杂不会改变其晶体结构;Sr3(PO4)2∶Eu2+荧光粉在310~390nm范围内可以有效的被激发,激发峰位于359nm;发射光谱为主峰位于438nm宽带发射(带宽约为150nm),对应于Eu2+的4f65d1→4f7跃迁.通过高斯拟合发现,Eu2+至少占据了Sr3(PO4)2两种不同的Sr2+格位,形成两个发光中心(430和459nm).当Eu2+的掺杂浓度为7%时,其具有最大的发光强度,继续增大Eu2+的掺杂浓度,Sr3(PO4)2∶Eu2+的发射光谱会出现浓度猝灭现象,且其发射峰会随着铕离子浓度增加而发生红移。Sr3(PO4)2∶Eu2+荧光粉在近紫外区有着强而宽的吸收带,与近紫外LED芯片发射相匹配,相对发光强度是蓝色荧光粉BaMgAl10O17∶Eu2+(BAM)的1.3倍,是一种很有前途的白光LED用蓝色荧光粉材料。更多还原

【Abstract】 A series of Sr3(PO4)2∶Eu2+blue phosphors were synthesized by high temperature solid state method under N2-H2 reducing atmosphere.The crystal structures,excitation and emission spectra were characterized by X-ray diffraction(XRD)and Photoluminescence(PL),respectively.The results show that the Sr3(PO4)2∶Eu2+phosphor can be efficiently excited by the wavelengths ranging from 310 to 390nm,and the excitation peak wavelength locates at 359 nm.A wide emission spectrum(~150nm,originating from the 4f65d1→4f7 of the Eu2+)with a peaking wavelength of 438 nm was obtained.Through the Gaussian fitting,we found that the emission band formed by two luminescence centers(430and 459nm),which indicated that the Eu2+occupied two different Sr2+sites in the substrate of Sr3(PO4)2.As the Eu2+doping concentration is 7%,the maximum luminous intensity was obtained.With the increasing of the doping concentration of the Eu2+,the concentration quenching effect occurred,and the emission peak wavelength has a red shift.The PL intensity of the Sr3(PO4)2∶Eu2+phosphor is about 1.3times than that of the blue emitting phosphor BaMgAl10O17∶Eu2+(BAM)which means that it is a promising candidate for the blue phosphor material for white LED.更多还原