白光发光二极管用CaAl2B2O7:Eu3+微晶的发光性质

利用高温固相法合成了CaAl2B2O7:Eu3 微晶。X射线衍射分析表明我们得到了纯相的CaAl2B2O7基质。样品在近紫外光和蓝光激发下能发出红光。发射光谱的主峰位于614nm,对应于Eu3 的5D0→7F2跃迁。激发光谱中两个主峰位于401nm和471nm,分别与紫外和蓝光LED相匹配。并研究了电荷补偿剂和Eu3 的浓度对样品发光强度的影响。所有掺入电荷补偿剂(Li ,Na 和K )样品的发光强度都比没有掺入电荷补偿剂的样品高。其中掺入Li 的样品的发光强度最高。Eu3 的最佳浓度为6%。CaAl2B2O7:Eu3 是一种有应用前景的白光LED用红色荧光粉。

Luminescent Properties of CaAl2B2O7:Eu3 + Crystallite for White Light-emitting Diode

The CaAl2B2O7 :Eu3+ crystallite was synthesized by the high temperature solid state reaction.X-ray diffraction pattern shows that pure CaAl2B2O7 matrix was obtained. The sample can emit red light under near-ultraviolet (UV) and blue Light excitation. The emission spectrum shows the most intense peak is located at 614nm, which corresponds to the 5D0→2F2 transition of Eu3+. The crystallite has two main excitation peaks located at 401nm and 471nm, which match the emission of UV and blue lightemitting diode (LED) respectively. The effects of charge compensations and the concentration of Eu3 + on the emission intensity were also investigated. The co-doped K+, Na+ and Li + can all lead to the strongly enhanced luminescence of CaAl2B2O2: Eu3+. The sample doped by Li+ has the highest emission intensity. The optimum concentration of Eu3+ is 6%. The CaAl2B2O7 :Eu3+ crystallite is a potential redemitting phosphor for white light-emitting diode.