采用水凝胶空间网孔结构作为纳米级反应容器可控制备了NaYF4:Yb3+,Er3+稀土上转换发光纳米颗粒.通过控制交联剂密度可以改变网络凝胶网孔结构,用不同网孔结构的凝胶模板可以控制合成纳米颗粒.通过XRD、TEM、PL等方法研究了不同凝胶模板对颗粒的尺寸、发光性能的影响.结果表明,利用高分子交联后形成的凝胶网络,可以制得粒径在10 nm左右的NaYF4∶Yb3+,Er3+纳米颗粒.随着交联剂浓度的升高,颗粒粒径及荧光强度都有所下降.本研究为稀土上转换发光纳米颗粒的制备提供了工艺简单、绿色环保的新方法.
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