采用水热法,通过氨水调节前驱液的pH值,制备了一系列2ZnO·2.2B2O3·3H2O∶ Eu3+样品.对所制备的样品进行X射线衍射和荧光光谱分析.研究结果表明:前驱液的pH值影响2ZnO·2.2B2O3·3H2O的结晶程度,在中性条件下制备的样品结晶度最好.当前驱液的pH =5.7时,激发光谱中的Eu-O电荷迁移带的峰位波长最大(262nm),这可能是由于在此条件下合成的样品中Eu-O键长最长.发射光谱表明:当前驱液的pH ＞5.7时,Eu3的发射光谱中的红橙比(I614/I589)随pH值的增大而增大,且当前驱液的pH值在5.7 ～6.9区间,红橙比(I614/I589)随pH值的增大的速率要比pH值在6.9～9.3之间增加的速率要快.另外,随着pH值的增大,样品的发光强度呈先增大后减小的变化趋势.当前驱溶液pH =8.1时,样品的发光强度最大.
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