Facile fabrication of SrAl2O4:Eu2+, Dy3+ hollow microsphere by a chemical induction self-transformation process

摘要

For the first time, SrAl2O4:Eu2+, Dy3+ hollow microsphere is successful synthesized via a newly developed solgel 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 degrees 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 mu m) 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 degrees 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 degrees C are 139.52 m(2)/g, 1.29 cm(3)/g and 37.08 nm, respectively.