Dy^(3+)激活的LiCaBO_3材料发光特性研究

Luminescence Characteristics of Dy^(3+) Activated LiCaBO_3 Phosphor

采用固相法制备了LiCaBO3:Dy3+发光材料.材料的发射光谱为一多峰宽谱,主峰分别为484、577和668nm;监测577nm发射峰,对应的激发光谱为一主峰位于331、368、397、433、462和478nm的宽谱.研究了Dy3+浓度对材料发射光谱及发光强度的影响,结果随Dy3+浓度的增大,材料的黄、蓝发射峰强度比(Y/B)逐渐增大;同时,发光强度呈现先增大后减小的趋势,最大值对应的Dy3+浓度为3.00mol%,其浓度猝灭机理为电偶极-电偶极相互作用.引入Li+、Na+或K+可增强材料的发射强度.InGaN管芯激发下的LiCaBO3:Dy3+材料呈现很好的白光发射,色坐标为x=0.3001,y=0.3152.

LiCaBO3∶Dy3＋ phosphor was synthesized by solid-state method. LiCaBO3∶Dy3＋ phosphor shows several bands peaking at 484, 577 and 668nm. Monitoring at 577nm peak, the excitation spectrum has several bands peaking at 331, 368, 397, 433, 462 and 478nm. The emission spectrum and luminescence intensity of LiCaBO3∶Dy3＋ phosphor were investigated by varying Dy3＋ concentration. The result shows that the ratio （Y/B） of yellow emission （577nm） to blue emission （484nm） increases with increasing Dy3＋ concentration. Moreover, the luminescence intensity firstly increases and then decreases with increasing Dy3＋ concentration, and reaches the maximum at 3.00mol% Dy3＋. And the concentration quenching mechanism is the d-d interaction by Dexter theory. The emission intensity of LiCaBO3∶Dy3＋ phosphor is enhanced with doping Li＋, Na＋ or K＋. The InGaNbased LiCaBO3∶Dy3＋ shows a nice white-emitting, and the CIE chromaticity is （x=0.3001, y=0.3152）.