白光LED用LiBaBO3:Eu2+材料发光特性研究

采用高温固相法制备了LiBaBO₃:Eu²⁺绿色发光材料.测量了Eu²⁺浓度为1mol%时样品的激发与发射光谱，其发射光谱为双峰宽谱，主峰分别为482和507nm，与理论计算值符合很好；监测482nm发射峰时，对应激发光谱的峰值为287和365nm，监测507nm发射峰时，对应的激发峰为365和405nm.研究了Eu²⁺浓度对材料发射光谱的影响，结果显示，随Eu²⁺浓度的增大，蓝、绿发射峰均发生了

Luminescence characteristics of LiBaBO3:Eu2+ phosphor for white LED

The LiBaBO₃:Eu²⁺ green phosphor was synthesized by high temperature solid-state method. With the Eu²⁺ doping of 1mol%, the emission and excitation spectra of LiBaBO₃:Eu²⁺ phosphor were measured. The emission spectrum shows two peaks at 482 and 507nm, which are in good agreement with the theoretical values. The excitation spectrum for 482nm emission has two excitation peaks at 287 and 365nm, and for 507nm excitation emission at 365 and 405nm. The effect of Eu²⁺ concentration on the emission spectrum of LiBaBO₃:Eu²⁺ phosphor was investigated. The results show that red shift takes place in the blue and green emission spectra with increasing Eu²⁺ concentration, and the blue emission disappears at 3 mol% Eu²⁺. However, the green emission always exists. The dependence of luminescent intensity of LiBaBO₃:Eu²⁺ phosphor on the Eu²⁺ concentration was studied, and the results show that the luminescent intensity firstly increases with the increasing Eu²⁺ concentration, then decreases, and reaches the maximal value at 3 mol% Eu²⁺. According to the Dexter theory, the concentration quenching mechanism is the d-d interaction.