一种新型红色荧光粉CaAl12O19： Eu,Mn的制备及发光性能

固相法制备了碱土金属铝酸盐荧光粉CaAl₁₂O₁₉ : Eu,Mn,测试了样品的XRD及激发与发射光谱,对样品的结构及其发光性能进行了分析,并且考察了灼烧温度及Eu³⁺的浓度对样品发光性能的影响,对Eu³⁺的作用机理进行了探讨。 该荧光粉能被波长短于550 nm的蓝绿光以及紫外和近紫外光激发,其发射光谱峰值在590,615,645,657 nm,其中前两个为Eu³⁺的特征发射,后两个为Mn⁴⁺的²E-⁴ A₂跃迁发射。该荧光粉的最佳烧结温度与时间分别为1 550 ℃和4 h,Eu³⁺的最佳掺杂摩尔分数为0.11%左右。

Synthesis and Luminescent Properties of a Novel Red Phosphor CaAl12O19 : Eu,Mn

Alkaline-earth metal aluminate phosphor CaAl12O19 : Eu,Mn was synthesized by solid reaction method. The structure, excitation and emission spectra of samples of phosphors were analyzed by XRD and F-4500, the influence of the calcination temperature and the concentration of Eu3+ on the luminescent performance of samples was observed.The influence mechanism of Eu3+ was studied. The results showed that the phosphors can be excited by the ultraviolet, near-ultraviolet, blue and green light below 550 nm, the emission peaks are at 590,615,645,657 nm, the peaks 590,615 nm are the characteristic emission of Eu3+, the another two peaks are the 2E-4A2 transition emission of Mn4+ . The experiments showed that the optimal calcination temperature and time are 1 550 ℃ and 4 h, respectively, the optimal mol fraction of Eu3+ is 0.11%.