Sr_3B_2O_6∶Eu^(3+),Li^+荧光粉的合成与发光性能

Synthesis and Luminescent Properties of Sr_3B_2O_6∶Eu^(3+),Li^+ Phosphor

采用高温固相法合成Sr3B2O6∶Eu3+,Li+红色荧光粉,考察了激活剂Eu3+和电荷补偿剂Li+浓度对Sr3B2O6∶Eu3+,Li+荧光粉发光性能的影响。结果表明:适量掺杂Eu3+、Li+离子并不改变Sr3B2O6的结构。当Eu3+掺杂量为4%、Li+的掺杂量为8%时,在900℃下灼烧2 h可以得到发光性能最佳的Sr2.9B2O6∶0.04Eu3+,0.08Li+红色荧光粉。以394 nm的近紫外光激发时,Sr3B2O6∶Eu3+,Li+荧光粉发射出红光,对应于Eu3+的4f-4f跃迁,其中以614 nm附近的5D0→7F2跃迁发光最强,是一种有潜力用于白光LED的红色荧光粉。

The red phosphor Sr3B2O6∶ Eu3 +,Li+was prepared by high temperature solid-state method. The effects of the concentration of activating agent Eu3 +and sensitizing agent Li+on luminescent properties of Sr3B2O6∶ Eu3 +,Li+were investigated. The results show that there is not obvious structure transformation of Sr3B2O6after appropriate amounts of Eu3 +and Li+doping. The optimal doping content of Eu3 +and Li+are 4% and 8%,respectively. The optimal temperature is 900 ℃ for 2 h. The phosphor Sr3B2O6∶ Eu3 +,Li+can be excited by 394 nm near-UV light and emits red light corresponding to the 4f-4f transition of Eu3 +. Its strongest emission peak is attributed to the5D0→7F2 transition of Eu3 +at about 614 nm. The phosphor could be a promising red phosphor for white LED.