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纳米发光材料LnVO₄:Eu（Ln=La,Gd,Y）的光谱研究

Spectral Studies of Nanosized LnVO₄:Eu（Ln= La, Gd, Y）

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【Author】 ZHANG Hong-wu~1, FU Xiao-yan~3, NIU Shu-yun~3, HAN Yan~3, SUN Gong-quan~1, XIN Qin~(1, 2)1. Dalian Institute of Chemical Physics, DMFC, Chinese Academy of Science, Dalian 116023, China2. Dalian Institute of Chemical physics, SKLC, Chinese Academy of Science, Dalian 116023, China3. Chemistry Department of Liaoning Normal University, Dalian 116029, China

【机构】中国科学院大连化物所直接醇燃料电池实验室(DMFC)；辽宁师范大学化学系；中国科学院大连化物所直接醇燃料电池实验室(DMFC) 辽宁大连116023；辽宁大连116029；辽宁大连116023；辽宁大连116023；中国科学院大连化物所催化国家重点实验室(SKLC)；

【摘要】采用络合溶胶凝胶法制备了系列纳米发光材料LnVO4:Eu(Ln =La ,Gd ,Y) ,并采用X射线衍射(XRD)、红外光谱 (FTIR)、荧光光谱以及紫外可见光谱 (UV Vis)对三种发光材料的结构以及发光性质进行研究。结果表明 :YVO4与GdVO4具有相同的结构 ,均属于四方晶系 ,二者具有相似的光谱性质 ;而LaVO4属于单斜晶系 ,受对称性的影响其光谱也相应的发生了变化 ,红外光谱和发射光谱的特征峰发生明显的宽化 ,紫外光谱峰的数目增多更多还原

【Abstract】 Nanosized LnVO₄:Eu （Ln=La, Gd, Y） with diameters ranging from 20 to 50 nm were synthesized by complex sol-gel technique. The structures and spectral properties of LnVO₄:Eu were studied by X-ray powder diffraction （XRD）, Fourier transform （FT-IR） spectroscopy, luminescence spectra and ultraviolet spectroscopy （UV）. The experimental results show that YVO₄:Eu and GdVO₄:Eu have similar spectral properties because they both have the structure of xenotime, while the structure of LaVO₄:Eu belongs to monazite, whose symmetry is inferior to the former vanadates. Consequently the spectral properties of LaVO₄:Eu are obviously （different） from the other two luminescence materials, as the peaks of infrared spectrum and emission spectrum become wider and the number of peaks in UV-Vis spectrum increases.更多还原