title: Synthesis of monodisperse spherical core-shell SiO2-SrAl2Si2O8: Eu2+phosphors by hydrothermal homogeneous precipitation method.
abstract: Nanocrystalline SrAl2Si2O8:Eu2+phosphor layers were coated on nonaggregated, monodisperse and spherical SiO2particles using a hydrothermal homogeneous precipitation. After annealing at 1100 °C, core-shell SiO2@SrAl2Si2O8:Eu2+particles were obtained. They were characterized with x-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy and photoluminescence techniques. XRD analysis confirmed the formation of SiO2@SrAl2Si2O8:Eu2+particles; it indicated that the SrAl2Si2O8:Eu2+shells on SiO2particles consisted of hexagonal crystallites. The core-shell phosphors obtained are well-dispersed submicron spherical particles with a narrow size distribution. The thickness of the coated layer is approximately 20-40 nm. Under ultraviolet excitation (361 nm), the particles emit blue light at about 440 nm due to the Eu2+ions in their shells.
authors.affiliation: Department of Chemistry, Jinan University, Guangzhou 510632, People's Republic of China.
authors.forename: Yidong
authors.initials: Y
authors.lastname: Li
authors.affiliation: Department of Chemistry, Jinan University, Guangzhou 510632, People's Republic of China.
authors.forename: Liyuan
authors.initials: L
authors.lastname: Xiao
authors.affiliation: Department of Chemistry, Jinan University, Guangzhou 510632, People's Republic of China.
authors.forename: Yingliang
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Department of Chemistry, Jinan University, Guangzhou 510632, People's Republic of China.
authors.forename: Pengfei
authors.initials: P
authors.lastname: Ai
authors.affiliation: Department of Chemistry, Jinan University, Guangzhou 510632, People's Republic of China.
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Chen
keywords: SiO2@SrAl2Si2O8:Eu2+; blue phosphor; core-shell structure; hydrothermal homogeneous precipitation method