橙红色荧光粉Li_2CaSiO_4:Sm^(3+)的发光性能研究

A Study of Luminescence of Reddish-orange Li_2CaSiO_4:Sm^(3+) phosphor

文章采用高温固相法经两次煅烧合成了一系列橙红色Li_2CaSiO_4:xSm^(3+)荧光粉,并利用X射线衍射仪和荧光光谱仪对样品的物相及发光性质等进行了表征。结果表明,架状硅酸盐Li_2CaSiO_4:xSm^(3+)荧光粉为纯相;荧光样品在408nm近紫外光激发下,有4个发射峰,分别位于565、604、652和713nm处,归属于Sm^(3+) 的5G5/2→6HJ(J=5/2,7/2,9/2,11/2)的特征跃迁,其中位于604nm处的主发射峰的相对发光强度最强。Sm^(3+) 的最佳掺杂浓度为1.5mol%,浓度猝灭机理为电偶极-电偶极相互作用。计算了该荧光粉掺杂不同浓度Sm^(3+) 的荧光寿命。

A series of orange-red Li2CaSiO4:xSm3+samples were prepared by conventional solid-state reaction.Crystallization and luminescent properties and so on were investigated.The results show that crystals of framework silicate Li2CaSiO4:xSm3+phosphor were pure phase;Upon 408nm excitation,the fluorescent samples presents four emission peaks which located at 565,604,652,713nm respectively,These peaks corresponded to the 5G5/2→6H(J J=5/2,7/2,9/2,11/2)transition of Sm3+.The strongest emission peak was located at 604nm.The optimum doping concentration of Sm3+was 1.5mol%,and the concentration quenching mechanism was the electric dipole-dipole interaction.The decay lifetime of the phosphors doped with different Sm3+amounts was calculated.