以乙二醇辅助水热法制备了Dy3+,Cr3+共掺杂ZnGa2O4的小尺寸、近红外长余辉纳米粒子(PLNPs).通过优化反应条件、锌的比例和共掺杂稀土离子Dy3+等措施,不仅提高了PLNPs的余辉发光性能,而且有效控制了PLNPs的粒径.结果表明,当起始溶液pH为7、Ga:Zn的比例为2:1.2、Dy3+的掺杂量为1％时,所合成的PLNPs的尺寸在6 nm左右,而且具有良好的余辉发光性能,其近红外余辉时间大于72 h,在高信噪比生物医学成像中具有潜在应用价值.
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