Rapid synthesis and photoluminescence properties of Eu-doped ZnO nanoneedles via facile hydrothermal method

Abstract

Eu-doped ZnO nanoneedles with different doping concentrations were prepared via the facile hydrothermal method. The crystal structure, morphology and photoluminescence property of the ZnO nanoneedles were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), X-ray photoelectron spectroscopy(XPS), photoluminescence spectroscopy(PL) and Raman spectroscopy. The results show that the europium ions are incorporated into the crystal lattice of ZnO matrix in trivalent ions. The nanoneedles are 2–3 μm in length and 100 nm in the tip diameter. PL and Raman measurements indicate that higher Eu³⁺ doping concentration may destroy the crystallization of the nanoneedles and decrease the ratio of I _UV/I _DLE, which is mainly due to the more defects in the doped ZnO nanoneedles. And the characteristic red emissions of Eu³⁺ ions are found by the PL spectroscopy with the Eu³⁺ doping concentration increasing, which are attributed to the ⁵ D ₀→⁷ F ₀, ⁵ D ₀→⁷ F ₁ and ⁵ D ₀→⁷ F ₂ transitions.

Keywords

ZnO nanoneedle / Hydrothermal method / Europium ion / Crystal structure / Photoluminescence property

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