Luminescence enhancement in bromine and samarium co-doped TiO₂ semiconductor nanocrystalline powders

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• 作者：Chunmei Gao ; Hongwei Song ; Lanying Hu ; Guohui Pan ; Ruifei Qin ; Fang Wang ; Qilin Dai ; Libo Fan ; Lina Liu ; Huihui Liu
• 关键词：TiO₂ ; Samarium ; Bromine ; Luminescence
• 刊名：Journal of Luminescence
• 出版年：2008
• 出版时间：April 2008
• 年：2008
• 卷：128
• 期：4
• 页码：559-564
• 全文大小：368 K

文摘

In this paper, TiO₂:Sm³⁺ (0.75 mol % ) nanoparticles doped with different amounts of Br⁻ were prepared by an improved sol–gel method and were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), VG ESCALAB MKIIX-ray photoelectron spectrometer (XPS) and ultraviolet–visible diffuse reflectance spectroscopy (UV–vis DRS). Their photoluminescence (PL) properties were investigated at room temperature. The emissions of ⁴G_5/2–⁶H_J (J=5/2, 7/2, 9/2) transitions of Sm³⁺ ions were observed under the excitation wavelength at 350 nm and the emission intensity depended strongly on the doping amount of Br⁻. TiO₂:Sm³⁺ (0.75 mol % ) nanoparticles doped with 1 mol % of Br⁻ calcined at 700 °C exhibit highest intensity of luminescence, which is nearly three times than the undoped one. The mechanism of photoluminescence in the co-doped system was discussed.