提高CaCO_3∶Eu^(3+),Li^+橙红色荧光粉发光性能的研究

Improvement of Luminescence Performance of Orange Red Phosphor CaCO_3∶Eu^(3+),Li^+

为了提高CaCO3∶Eu3+,Li+橙红色荧光粉发光性能,采用硼酸作助熔剂,通过高温固相法合成了橙红色荧光粉CaCO3∶Eu3+,Li+,其结构属于方解石型CaCO3结构。CaCO3∶Eu3+,Li+的主激发峰位于275 nm,主发射峰位于595 nm附近,对应于Eu3+的5D0→7F1跃迁,发射橙红色光。研究了激活剂Eu3+、敏化剂Li+及助熔剂H3BO3的浓度对样品发射光谱的影响。结果表明,CaCO3∶Eu3+,Li+中Eu3+、Li+和H3BO3的最佳浓度分别为2%、8%和3%。3%H3BO3的加入,将相对发光强度提高了165%。

The orange red phosphor CaCO3：Eu^3＋ ,Li^＋was prepared in the presence of boric acid as a flux by high temperature solid-state method. It belongs to the calcite type structure of CaCO3. The main excitation peak of CaCO3：Eu^3＋ ,Li^＋is located at 275 nm,and its main emission peaks are located at about 595 nm,which is attributed to the5D0→7F1transition of ：Eu^3＋ . The phosphor emits orange red light. The effects of molar fraction of ：Eu^3＋ ,Li^＋and H3BO3 on emission spectra were investigated. The results show that the best molar fraction of ：Eu^3＋ ,Li^＋and H3BO3 was 2%,8% and 3%,respectively. Addition of 3% H3BO3 increased the relative luminous intensity of the powder by 165%.