【摘要】 采用凝胶-燃烧法合成LaSrAl₃O₇:x%Eu³⁺,y%Tb³⁺系列荧光粉.利用X射线粉末衍射、激发光谱、发射光谱等对该荧光粉组成,发光性能进行研究.结果表明:在LaSrAl₃O₇:x%Eu³⁺激发光谱和LaSrAl₃O₇:y%Tb³⁺发射光谱中存在一定的重叠部分,因此LaSrAl₃O₇基质中Eu³⁺和Tb³⁺之间可能存在能量传递;在267 nm紫外光激发下,在LaSrAl₃O₇:x%Eu³⁺,y%Tb³⁺的发射光谱中同时出现Eu³⁺和Tb³⁺的特征峰,固定Tb³⁺的含量调节Eu³⁺的掺杂量,随着Tb³⁺的发射峰强度逐渐减弱,而Eu³⁺的发射峰强度逐渐增强,能量传递效果越来越显著,从而使LaSrAl₃O₇:x%Eu³⁺,y%Tb³⁺荧光粉发光颜色由绿色向白色变化,白色再到橙色,得出系列发射白光的荧光粉,通过控制Eu³⁺和Tb³⁺的比例,Eu³⁺调控范围在4%～8%实现其荧光粉白光发射.LaSrAl₃O₇:x%Eu³⁺,y%Tb³⁺有望成为白光发光材料,并具有潜在的应用价值.更多还原

【Abstract】 LaSrAl₃O₇:x%Eu³⁺,y%Tb³⁺ phosphors were synthesized by using a gel-combustion method.X-ray powder diffraction,excitation spectrum and emission spectrum were utilized to characterize the phosphors on composition and luminescence properties.The results showed that the excitation spectra of LaSrAl₃O₇:x%Eu³⁺ overlapped emission spectra of LaSrAl₃O₇:y%Tb³⁺ in some area,suggesting the possibility of energy transfer between Eu³⁺ and Tb³⁺ in LaSrAl₃O₇:x%Eu³⁺.Under the ultraviolet light excitation in 267 nm,the characteristic peaks of Eu³⁺ and Tb³⁺ appeared simultaneously in the emission spectrum of the samples.When the concentration of Tb³⁺ was fixed and the doping concentration of Eu³⁺ was adjusted,the emission peak of Tb³⁺ was weakened and that of Eu³⁺ was enhanced.With the effect of energy transfer increasing, the luminescence colors of LaSrAl₃O₇:x%Eu³⁺,y%Tb³⁺ phosphors turn from green to white and then to orange.By controlling the proportion of Eu³⁺ and Tb³⁺,the white light emission of the phosphors could be realized when Eu³⁺ ranged from 4% to 8%.The results indicated that the LaSrAl₃O₇:x%Eu³⁺,y%Tb³⁺ were expected to be white light emitting materials and had potential application in practice.更多还原