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摘要
以La2O3、Dy2O3、浓HNO3、偏钒酸钠、氢氧化钠、无水乙醇、乙二醇为原料,采用十六烷基三甲基溴化铵(CTAB)辅助水热法合成了四方晶系锆石结构的LaVO4:Dy3+棒状纳米晶体。并用X粉末衍射(XRD)、扫描电镜(SEM)、红外光谱(FT-IR)和荧光光谱(FL)对产品进行了表征和分析。测试结果表明,所得样品为四方锆石型结构,反应pH从7升至10,纳米棒增长60～70nm。LaVO4:Dy3+纳米棒分别在574nm和484nm处有较强的黄光发射(4F9/2→6H13/2)和蓝光跃迁(4F9/2→6H15/2),通过改变反应的pH和Dy3+掺杂量达到对黄蓝光强度比值(Y/B)的有效调控,Y/B值最大达1.207。
Abstract
La2O3,Dy2O3,HNO3,NaVO3,NaOH,C2H5OH and CH2OHCH2OH were used as raw materials,LaVO4:Dy3+ nanorods were successfully prepared via a facile hydrothermal method assisted by cetyltrimethyl ammonium bromide (CTAB).The as-prepared preducts were characterized by X-ray diffraction,scanning electron microscope,infrared spectrum and fluorescence spectra.The results showed that,all the samples were well crystallized and assigned to the zircon-type tetragonal (t-) phased LaVO4 nanorods.The nanorods were changed with different reaction pH value.With the increase of pH value from 7 to 10,the grain of sample became longer about 60～70nm.LaVO4:Dy3+ nanorods exhibited simultaneously the blue (484 nm) and yellow (574 nm) emissions.The broad blue-yellow emissions were attributed to 4F9/2→6H15/2 and 4F9/2→6H13/2 transition of Dy3+ ion in LaVO4 matrix.In addition,the LaVO4:Dy3+ nanorods exhibited the strongest yellow emisson and blue emission,and the Y/B value can be controlling via different reaction pH and Dy-doped concentration.Furthermore,it can obtain the largest Y/B value (1.207).
关键词
水热合成
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LaVO4:Dy3+纳米棒
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荧光性能
Key words
hydrothermal synthesis
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LaVO4:Dy3+ nanorod
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luminescent property
棒状LaVO4:Dy3+纳米晶的水热合成及荧光性能研究[J].
化工新型材料, 2019, 47(1): 70-73 DOI:
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基金资助
广西高校科学技术研究项目(KY2015LX301);玉林师范学院青年基金项目(2012YJQN31);玉林师范学院高层次人才科研启动项目(G20160002)
