Abstract For the first time, SrAl2O4:Eu2+, Dy3+ hollow microsphere is successful synthesized via a newly developed sol-gel synthetic method combined with the self-transformation process of chemical induction. In this approach, researchers are able to get this gel in seconds, and after it is immersed in the isopropanol at the temperature of 60 °C, the SrAl2O4:Eu2+, Dy3+ hollow microsphere precursors can be synthesized through the self-transformation of chemical induction. The outer surface of SrAl2O4:Eu2+, Dy3+ hollow precursors (diameter in 1–2 μm) is similar to sea urchins, which consists of randomly clustered and interconnected nanoplatelets. SrAl2O4:Eu2+, Dy3+ hollow microsphere phosphors can be synthesized by calcining SrAl2O4:Eu2+, Dy3+ hollow microsphere precursors at an appropriate temperature. The optimum calcination temperature of the SrAl2O4:Eu2+, Dy3+ hollow microsphere phosphors is 1050 °C, which have a well hollow-core construction and sea urchin-like outer surface. The photoluminescence spectra and luminance decay analysis indicate that the SrAl2O4:Eu2+, Dy3+ hollow microsphere phosphors have satisfactory persistent phosphorescence. The specific surface area, mean diameter of pores, as well as pore volume of the sample heated at 1050 °C are 139.52 m2/g, 1.29 cm3/g and 37.08 nm, respectively.

中文翻译：

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化学诱导自转化法制备 SrAl2O4:Eu2+, Dy3+ 空心微球

摘要 采用新开发的溶胶-凝胶合成方法结合化学诱导的自转化过程，首次成功合成了SrAl2O4:Eu2+、Dy3+空心微球。在这种方法中，研究人员能够在几秒钟内得到这种凝胶，将其浸入 60 °C 的异丙醇中后，可以通过化学诱导的自转化合成 SrAl2O4:Eu2+、Dy3+ 空心微球前体. SrAl2O4:Eu2+、Dy3+ 空心前体（直径在 1-2 μm）的外表面类似于海胆，由随机聚集和互连的纳米片组成。SrAl2O4:Eu2+、Dy3+ 空心微球荧光粉可以通过在适当的温度下煅烧 SrAl2O4:Eu2+、Dy3+ 空心微球前体来合成。SrAl2O4:Eu2+、Dy3+空心微球荧光粉的最佳煅烧温度为1050℃，具有良好的空心结构和海胆状外表面。光致发光光谱和亮度衰减分析表明，SrAl2O4:Eu2+、Dy3+空心微球荧光粉具有令人满意的持久磷光。样品在 1050°C 加热时的比表面积、平均孔径和孔体积分别为 139.52 m2/g、1.29 cm3/g 和 37.08 nm。