白光 LED 用 LiY（MoO 4）2∶RE3＋（RE＝Eu,Sm,Pr）荧光粉的制备与性能*

摘要

LiY(MoO 4 )2 ∶RE3 + (RE=Eu,Sm,Pr)red phosphors have been successfully synthesized via a mild and facile hydrothermal route.The resulting products were characterized by X-ray powder diffraction (XRD), scanning electron microscopy(SEM),and photoluminescence(PL)spectroscopy.The results showed that the phosphors prepared by hydrothermal method are with LiY(MoO 4 )2 crystalline phase,the phosphors with layer meso-structure and uniform particle size distribution.Eu3 + ,Sm3 + and Pr3 + concentration of 7%,4% and 1.5%. LiY(MoO 4 )2 ∶Eu3 + powders can be excited efficiently by ultraviolet light with the wavelength of 395 nm and visible blue light with the wavelength of 465 nm.The Sm3 + and Pr3 + doped LiY(MoO 4 )2 phosphors can be ex-cited efficiently by 406 and 453 nm,and show a strong red emission of 650 and 657 nm.The LiY(MoO 4 )2 ∶RE3 + (RE=Eu,Sm,Pr)phosphors are proming as red-emitting phosphors for white light emitting diodes.%采用水热法制备了 LiY(MoO 4)2∶ RE3＋(RE＝ Eu、Sm、Pr)系列荧光粉,通过 X 射线衍射(XRD),扫描电镜(SEM)对该系列荧光粉的物相、形貌进行了表征.结果表明,稀土离子的掺入没有改变荧光粉的晶相,3种稀土离子的加入使得 LiY (MoO 4)2粉体形成片层状结构.利用 PL(光致发光光谱)对样品的发光性能进行了测试,分析了稀土离子掺杂浓度对发光强度的影响并进行浓度猝灭机理分析,结果表明,Eu3＋、Sm3＋、Pr3＋最佳掺杂浓度分别为7％,4％和1．5％.LiY(MoO 4)2∶Eu3＋荧光粉能够很好地被395 nm 的紫外光和465 nm 的蓝光有效激发而发射红光,而 Sm3＋和 Pr3＋掺杂的 LiY(MoO 4)2分别在406和453 nm 激发下,发射出650和657 nm 的红光,LiY(MoO 4)2∶RE3＋(RE＝Eu、Sm、Pr)系列荧光粉有望成为白光 LED 用红色荧光粉.