合成工艺对Sr_3B_2O_6:Eu^(2+)黄色荧光粉结构和发光性能的影响

Influence of Synthetic Technology on the Structure and Luminescent Properties of Sr_3B_2O_6:Eu^(2+) Yellow Phosphor

采用高温固相法合成了暖白光LED用Sr3B2O6∶Eu2+黄色荧光粉,系统地研究了灼烧温度和保温时间对荧光粉的结构和发光性能的影响。结果表明,荧光粉的最佳合成温度和保温时间分别为1 150℃和2h,荧光粉的晶体结构为三角晶系Sr3B2O6,烧结温度和保温时间对晶粒的发育具有重要的影响。荧光粉的激发光谱是主峰位于398nm宽带谱,近紫外和蓝光均能激发,发射光谱是峰值位于574nm的宽带谱,烧结温度和保温时间主要影响荧光粉的发光强度。

The Sr3B2O6∶Eu^2＋ yellow phosphor for warm white LED was synthesized by high temperature solid phase method.The influences on the phosphor structure and luminous properties of sintering temperature and holding time were systematically studied.Results indicated that the optimum synthetic temperature and soaking is 1 150 ℃ and 2 hours respectively.The crystalline structure of phosphor is rhombohedral Sr3B2O6.Sintering temperature and holding time has a significant influence on grain development.The excitation spectrum of phosphor composes of a wide-band spectrum main peaking at 398 nm,and the phosphor can be excited by near ultraviolet and blue light.The luminescence spectrum of phosphor is a broad spectrum peaking at 574 nm.Sintering temperature and holding time have a main effect on luminous intensity of phosphor.