Kong Deyan, Yu Min, Lin Cuikun, Lin Jun (Key laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China)
<正> The synthesis and luminescence properties of Zn2SiO4: Mn phosphor layers on spherical silica spheres, i. e. , a kind of core-shell complex phosphor, Zn2SiO4: Mn@SiO2 were described. Firstly, monodisperse silica spheres were obtained via the Stober method by the hydrolysis of tetraethoxysilane(TEOS)Si(OC2H5)4 under base condition (using NH4OH as the catalyst). Secondly, the silica spheres were coated with a Zn2SiO4: Mn phosphor layer by a Pechini sol-gel process. X-ray diffraction (XRD), scanning electron microscope(SEM), energy-dispersive X-ray spectrum (EDS) and photoluminescence (PL) were employed to characterize the resulting complex phosphor. The results confirm that 1000℃annealed sample consists of crystalline Zn2SiO4: Mn shells and amorphous SiO2 cores. The phosphor show the green emission of Mn2+ at 521 nm corresponding 4T1(4G)-6A1(6S) transition, and the possible luminescence mechanism is proposed.
sol-gel; core-shell phosphor; zinc orthosilicate; Mn2+; silica; rare earths
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