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使用化学共沉淀法合成出粒径为1~2μm的Mg掺杂的PDP用铝酸盐绿色荧光粉,研究了共沉淀产物在高温煅烧中的物相变化和颗粒长大过程,并使用该超细PDP绿粉进行了涂屏实验.结果表明,共沉淀产物的物相转变过程异常复杂,中间相包括Ba-C3、γ-Al2O3、BaF2、BaAl2O4和两个含Mn的化合物,在整个物相转变过程中没有出现α-Al2O3相;合成温度比高温固相反应法明显降低,1200℃时即可形成物相纯净的Mg掺杂的BaAl2O19:Mn2荧光粉.该方法有效地控制了荧光粉的颗粒大小和形貌,制备出的荧光粉颗粒呈六角片状,粒径细小,且具有优良的发光特性.喷涂实验表明,使用该荧光粉得到荧光粉层致密、表面平坦,有利于获得更大的放电空间.

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