采用高温固相法合成了绿色荧光粉CaBa2(BO3)2∶Tb3+ 并对其发光特性进行了研究。发射峰值位于496, 549, 588, 622 nm,分别对应Tb3+的5D4 →7F6、5D4 →7F5、5D4 →7F4、5D4 →7F3 能级跃迁。其中以496 nm和549 nm的发射峰最强,样品呈现很好的绿色发光。 主要激发峰位于200~300 nm之间, 属于4f75d1宽带吸收。考察了Tb3+掺杂浓度和Li+ , Na+ 和 K+ 作为电荷补偿剂对样品发光性能的影响,几乎不发生浓度猝灭现象, Li+的补偿效果最好。还确定了原料CaCO3、BaCO3、H3BO3的最佳配比, 当H3BO3过量3%时, 合成的晶体发光亮度最好。

CaBa2(BO3)2∶Tb3+ green phosphor was synthesized by the general high temperature solid-state reaction and its luminescence properties were investigated. It shows four major emission peaks locating at 496, 549, 588 and 622 nm, corresponding to the 5D4 →7F6, 5D4 →7F5, 5D4 →7F4 and 5D4 →7F3 typical transition of Tb3+, respectively. The most intense peaks located at 496 nm and 549 nm, the phosphor shows excellent green emission.The excitation spectra contains a abroad band extending from 200 nm to 300 nm, which correspond to 4f7-5d1 broadband absorption. The effects of doped Tb3+ concentration and charge compensating of Li+, Na+ and K+ on the emission intensity were also investigated: the concentration quench phenomenon does not appear nearly and Li+ gives the best improvement to enhance the intensity of the emission.Make sure the best mixture ratio of raw material which are CaCO3,BaCO3,H3BO3. Emission intensity of synthetic crystal is the best, when H3BO3 is excessive to 3%.