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蓝色发光材料Sr_2Al_6O_(11):Eu~(2+)的微波合成及性能
作者:刘文芳 宋会花  
单位:河北师范大学化学与材料科学学院 河北师范大学化学与材料科学学院 石家庄050016 石家庄050016 
关键词:铝酸锶  微波合成  蓝色发光材料 
分类号:O611.3
出版年,卷(期):页码:2008,36(S1):81-84
DOI:
摘要:
在微波场作用下快速合成了蓝色发光材料Sr_2Al_6O_(11):Eu~(2+)。由X射线衍射分析样品的晶相,扫描电镜观测晶体形貌。结果表明:产品为正交晶系,Pnnm空间群,a=2.191 827nm,b=0.840 857nm,c=0.488 175nm。产物主要为直径为200nm左右,长度约在1~2mm的棒状晶体,其间混有少量球状晶体。激发和发射谱均为宽带谱,主发射峰位于462nm处附近,半高宽为64nm,Eu~(2+)在Sr_2Al_6O_(11)基质中存在2个发光中心,经Gaussian曲线拟合,其2个分量分别位于456.7nm和483.4 nm处,与高温固相反应法合成的样品相比,这两个峰发生蓝移。随Eu~(2+)掺量的增大,2个发光中心的发光强度同时先增强后减弱,Eu~(2+)的掺量为0.1 mol时发光最强。
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Blue luminescent material of SrAl_2O_(11):Eu~(2+) was synthesized by the microwave radiation method.The crystal composition and crystal shape of the samples were characterized by X-ray diffraction and scanning electron microscopy.The results show that the synthe- sized sample is an orthorhombic system,Pnnm space group (α=2.191 827 nm,b=0.840 857 nm and c=0.488 175 nm).Most of the samples are stick-shaped crystals 200 nm in diameter and 1-2 mm in length;furthermore,a few ball-shaped crystals were mixed in with them.The excitation and emission spectra of the SrAl_2O_(11):Eu~(2+) exhibite broadband peaks,and the main emission peak is located at 462 nm,with the full width at half maximum (FWHM) of 64nm.Eu~(2+) has two luminescence centers,and the peaks of Eu~(2+) are located at 456.7 nm and 483.4 nm with the Gaussian curve fit method.The positions of the two peaks are blue-shifted by contrast with the high-temperature solid reaction method.With the increase of the doping concentration of Eu~(2+),the strength of the emission peaks of the two centers increased first and decreased later.When the doping amount of Eu~(2+) was 0.1 (in mole) the luminescent strength is the greatest.
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基金项目:
河北师范大学博士基金(103261);; 国家自然科学基金(20601007);; 河北省教育厅基金(ZH2006002)资助项目。
作者简介:
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参考文献:
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