纳米棒状长余辉材料BaAl_2O_4:Eu~(2+),Dy~(3+)的制备与发光性能

利用硝酸铝、硝酸钡、尿素为原料,以一定比例H_2O/正丁醇及H_2O/正丁醇/SBS的混合液作传递压力的介质,进行反应,然后将得到的前驱体在还原气氛下高温煅烧,得到亮度高,余辉时间长的BaAl_2O_4:Eu~(2+),Dy~(3+)纳米棒状长余辉发光材料。TEM和SEM测试表明高温煅烧后得到的BaAl_2O_4:Eu~(2+),Dy~(3+)为棒状结构,其激发光谱和发射光谱均为宽带,主发射峰分别为498 nm,是典型的Eu~(2+)5d→4f跃迁。该方法的特点在于:采用水热法合成的BaAl_2O_4:Eu~(2+),Dy~(3+)长余辉发光材料一般需经过高温煅烧,容易结块,而在合成制得的产品经1 300℃高温煅烧后仍呈现分散性良好的棒状结构,不需球磨,且发光性能良好,可直接应用。同时将2种不同的实验条件进行比较,发现在不使用表面活性剂的条件下依然可得到分散性良好的棒状BaAl_2O_4:Eu~(2+),Dy~(3+)长余辉发光材料。该制备方法有望在其他铝酸盐和硅酸盐系长余辉发光材料的制备中得到应用。

Synthesis and Properties of Nanorod-Long Afterglow BaAl_2O_4 : Eu~(2+), Dy~(3+) Phosphor

The present paper mainly reports a new method to synthesize long afterglow photoluminescent material BaAl_2O_4 : Eu~(2+) , Dy~(3+). Al(NO_3)_3 ·9H_2O, Ba(NO_3)_2, urea, RE(NO_3)_3(RE=Eu, Dy) were employed as raw materials, the admixture of H_2O/n-butanol and H_2O/n-butanol/SBS were used as medium, then BaAl_2O_4 : Eu~(2+), Dy~(3+) phosphor was achieved by calcining the precursor, which was synthesized by hydrothermal method, at 1 300℃ under reduction atmosphere. The TEM and SEM were used to analyse the morphology and BaAl_2O_4: Eu~(2+) , Dy~(3+) synthesized by annealing at 1 300 ℃ are all nanorods. The excitation and emission spectra of the phosphor indicated that all of them are broad band, and the main emission peak is around 498 nm, which is due to 5d→4f transition of Eu~(2+). The state-solid synthesis of the long afterglow phosphor BaAl_2O_4 : Eu~(2+) , Dy~(3+) generally requires a high calcination temperature, so the products are easily agglomerated, and in this paper the hydrothermal solvothermal synthesis was used, so the synthesized products calcined at 1 300 ℃ still present well-dispersed rod structure, need not milling, and display well luminescence performance. The authors compared the two different conditions of experiment, and found that under the condition without surfactant the authors can still get well-dispersed rod structure of Ba-A1_2O_4: Eu~(2+) , Dy~(3+). The method is hopeful to be used in synthesizing other alkali-earth aluminate and silicate and other luminescent materials.