以Na2CO3为电荷补偿剂,采用凝胶-燃烧法合成新型红色硅酸盐发光材料SrMgSi2O6:Eu3+.用X射线粉末衍射仪、荧光分光光度计等对合成产物进行分析和表征.结果表明:SrMgSi2O6:Eu3+的晶体结构与Sr2MgSi2O7相同,同属四方晶系.样品nSrMgSi2O6:Eu3+的激发光谱在220~300 nm出现一宽带吸收,归属于O2--Eu3+之间的电荷迁移,300 nm以后出现的锐线峰为Eu3+的f-f跃迁吸收峰,其最强锐线峰位于400 nm,因而,可以被InGaN管芯产生的紫外辐射有效激发.发射光谱由两个强发射峰组成,位于592和618 nm处,分别属于典型的Eu3+的5D0→7F1和5D0→7F2跃迁.此外,研究发现:共掺Gd3+或Ti4+均能敏化Eu3+的发光,可有效提高样品的红光发射.因此,SrMgSi2O6:Eu3+,M(M=Gd3+,Ti4+)有望成为一种与InGaN管芯匹配的白光LED用红色荧光粉.
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