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使用化学沉淀法制备细粒径、分散性好的圆饼状α-Al2O3粉体,并以此为原料,通过高温固相法制备粒径细小、颗粒形貌规则的高性能BaMgAl10O17:Eu2+(BAM)荧光粉,重点研究合成过程中的物相转变及颗粒生长等过程。结果表明:氧化铝原料颗粒对最终BAM荧光粉的颗粒形貌和粒径起到重要作用,经过1500℃煅烧2h后生成的BAM仍基本维持原α-Al2O3颗粒的圆饼状外形,颗粒粒径仍为2.5μm左右且分散性良好。高温固相法制备BAM荧光粉的过程中,1000℃时,首先在α-Al2O3颗粒表面反应形成一层BaAl2O4相,当温度继续升高,MgO参与反应,通过BaAl2O4层进行传质过程,并最后完全转变为BaMgAl10O17相。发光性能测试表明:使用自制氧化铝制备的BAM荧光粉具有良好的发光特性,其发射光谱峰的强度和半峰宽与使用商用氧化铝原料所制得的荧光粉的相当。
Using the method of chemical precipitation, a round cake α -Al2O3 powder with fine particle size and good dispersibility was prepared, and the high-performance BaMgAl10O17: Eu2 + (BAM ) Phosphor, focusing on the synthesis of the phase transition and particle growth process. The results show that the alumina particles play an important role in the particle morphology and particle size of the final BAM phosphor. The BAM formed after calcination at 1500 ℃ for 2h still maintains the shape of the original α-Al2O3 particles. The particle size It is about 2.5 micrometers and dispersibility is good. During the preparation of BAM phosphor by high temperature solid-state reaction, a layer of BaAl2O4 phase is first formed on the surface of α-Al2O3 particles at 1000 ℃. When the temperature continues to rise, MgO participates in the reaction and passes through the BaAl2O4 layer for mass transfer. Finally, Completely transformed into BaMgAl10O17 phase. Luminescence performance tests show that the BAM phosphor prepared by using self-made alumina has good luminescence property, the intensity and the half-width of its emission peak are comparable with those obtained by using commercial alumina raw materials.