白光发光二极管用CaAl_2B_2O_7:Eu^(3+)微晶的发光性质(英文)

Luminescent Properties of CaAl_2B_2O_7:Eu^(3+) Crystallite for White Light-emitting Diode

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。

The CaAl2B2O7：Eu^3＋ 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→7F2 transition of Eu^3＋. The crystallite has two main excitation peaks located at 401nm and 471nm, which match the emission of UV and blue light-emitting diode （LED） respectively. The effects of charge compensations and the concentration of Eu^3＋ on the emission intensity were also investigated. The co-doped K^＋, Na^＋ and Li^＋ can all lead to the strongly enhanced luminescence of CaAl2B2O7：Eu^3＋. The sample doped by Li^＋ has the highest emission intensity. The optimum concentration of Eu^3＋ is 6%.The CaAl2B2O7：Eu^3＋ crystallite is a potential red-emitting phosphor for white light-emitting diode.