Hydrothermal Synthesis and Luminescent Properties of Flowerlike Zn_2GeO_4 and Mn^(2+)-Doped Zn_2GeO_4 Hierarchical Architectures

摘要

Three-dimensional(3D) flowerlike hierarchical Zn2GeO4 and Mn2+-doped Zn2GeO4 microstructures have been prepared by a facile hydrothermal approach. X-Ray diffraction(XRD), field emission scanning electron micro-scopy(FESEM), transmission electron microscopy(TEM) and photoluminescence(PL) spectrometry were employed to characterize the samples. Such flowerlike hierarchical Zn2GeO4 microstructures with an average diameter of 3―4 μm were found to be constructed by abundant single crystalline nanorods of about 90 nm in diameter. The luminescent properties of Zn2GeO4:xMn phosphors with different contents of Mn2+ as an activator were investigated. The Mn2+-doped samples showed green luminescence corresponding to the d-d transition of Mn2+ under the irradiation of UV light. The red shift(from 531 nm to 538 nm) in λem with increasing Mn2+ content was observed in the luminescent spectra, which should be attributed to a weak crystal field because of the substitution of Zn2+ by Mn2+ at a distorted tetrahedral lattice site.