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Effect of structural and Eu~(3+) amount in TiO_2 semiconductor material on downconversion photoluminescence properties

机译：TiO_2半导体材料的结构和Eu〜（3+）量对下转换光致发光性能的影响

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摘要

The search for new materials for application in energy production and conversion has identified inorganic oxides doped with rare earth ions as promising candidates for the construction of photovoltaic devices for energy conversion. This work presents the synthesis of TiO2 powders doped with Eu3+, using propylene glycol in the reaction medium, changing the europium percentage at 0.2, 3 and 7 mol%, and heat-treated at 700, 750, 800 and 900 degrees C for 8 h. The results of X-ray diffraction showed the formation of TiO2 polymorphs (anatase and rutile), both belonging to the tetragonal system and also the formation of europium titanate. The Rietveld refinement showed the deformation of the network parameters and volume of the unit cell, as well as the percent composition of the phases. Raman spectroscopy corroborated the results of XRD. Photoluminescence results showed that the synthesized materials have intense emission in the red region with the most intense band positioned at 614 nm assigned to the D-5(0) - F-7(2) transition of Eu3+ mainly in the sample with 3 mol% of Eu3+ heat-treated at 700 degrees C. The life time results showed that the photoluminescence of the materials are dependent on the crystalline structure, the host matrix in which the Eu3+ is localized, and the amount of the dopant in the sample. According to the results obtained in this work, the materials have the interesting downconversion effect, being a great absorber of UV-vis energy and converting that energy to the visible region. Materials with these photoluminescence properties associated with the structural properties are very interesting for use in the improvement of solar cells.
机译：在寻找用于能源生产和转换的新材料的过程中，已将掺有稀土离子的无机氧化物确定为用于能源转换的光伏器件的有前途的候选材料。这项工作提出了在反应介质中使用丙二醇，将0.2的百分含量更改为0.2、3和7 mol％并在700、750、800和900摄氏度下热处理8小时的方法，以合成掺杂Eu3 +的TiO2粉末。 。 X射线衍射结果表明形成了TiO2多晶型物（锐钛矿型和金红石型），它们既属于四方晶系，也属于钛酸euro。 Rietveld细化显示网络参数的变形和晶胞的体积，以及相的百分比组成。拉曼光谱证实了XRD的结果。光致发光结果表明，在3 mol样品中，合成的材料在红色区域具有较强的发射光，最强的光带位于614 nm处，属于Eu3 +的D-5（0）-> F-7（2）跃迁。 ％的Eu 3+在700℃下热处理。寿命结果表明，材料的光致发光取决于晶体结构，Eu 3+所处的主体基质以及样品中掺杂剂的量。根据这项工作获得的结果，这些材料具有令人感兴趣的降频转换效果，它是紫外线可见能量的强大吸收剂，并将该能量转换为可见光区域。具有与结构性质相关的这些光致发光性质的材料对于用于太阳能电池的改进是非常有趣的。

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  • 来源
    《Optical Materials》 |2019年第2期|522-533|共12页
  • 作者

    Arantes Danilo C.; de Mayrinck Caroline; Santos Jordana D.; Maia Lenize F.; Oliveira Luiz F. C.; Schiavon Marco A.; Pasquini Daniel; de Lima Renata C.; de Morais Luiz C.; Esbenshade Jennifer; Ferrari Jefferson L.;

  • 作者单位

    Univ Fed Sao Joao del Rei UFSJ, Dept Ciencias Nat, GPQM, Campus Dom Bosco,Praca Dom Helvecio 74, BR-36301160 Sao Joao Del Rei, MG, Brazil|Univ Fed Uberlandia, IQ, Lab Mat Fotoluminescentes LAMAF, Desenvolvimento Mat Inorgan Terras Raras DeMITeR, Bloco 3Z,Ave Joao Naves de Avila 2121, BR-38400902 Uberlandia, MG, Brazil;

    Univ Fed Sao Joao del Rei UFSJ, Dept Ciencias Nat, GPQM, Campus Dom Bosco,Praca Dom Helvecio 74, BR-36301160 Sao Joao Del Rei, MG, Brazil;

    Univ Fed Juiz de Fora, Dept Quim, NEEM, Rua Jose Lourengo Kelmer S-N, BR-36036330 Juiz de Fora, MG, Brazil;

    Univ Fed Juiz de Fora, Dept Quim, NEEM, Rua Jose Lourengo Kelmer S-N, BR-36036330 Juiz de Fora, MG, Brazil;

    Univ Fed Juiz de Fora, Dept Quim, NEEM, Rua Jose Lourengo Kelmer S-N, BR-36036330 Juiz de Fora, MG, Brazil;

    Univ Fed Sao Joao del Rei UFSJ, Dept Ciencias Nat, GPQM, Campus Dom Bosco,Praca Dom Helvecio 74, BR-36301160 Sao Joao Del Rei, MG, Brazil;

    Univ Fed Uberlandia, Inst Quim, Lab Reciclagem Polimeros LABREPOL, Ave Joao Naves de Avila 2121, BR-38400902 Uberlandia, MG, Brazil;

    Univ Fed Uberlandia, Inst Quim, GQMIN, Ave Joao Naves de Avila 2121, BR-38400902 Uberlandia, MG, Brazil;

    Univ Fed Triangulo Mineiro, ICENE, Lab Pesquisa Polimeros Nanotecnol & Aplicacoes, Unidade 2 Univ,Ave Dr Randolfo Borges 1400, BR-38064200 Uberaba, MG, Brazil;

    Univ Tennessee Martin, Dept Chem & Phys, Martin, TN USA;

    Univ Fed Sao Joao del Rei UFSJ, Dept Ciencias Nat, GPQM, Campus Dom Bosco,Praca Dom Helvecio 74, BR-36301160 Sao Joao Del Rei, MG, Brazil|Univ Fed Uberlandia, IQ, Lab Mat Fotoluminescentes LAMAF, Desenvolvimento Mat Inorgan Terras Raras DeMITeR, Bloco 3Z,Ave Joao Naves de Avila 2121, BR-38400902 Uberlandia, MG, Brazil;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Titanium dioxide; Photoluminescence; Downconversion; Rare earths;

    机译：二氧化钛;光致发光;下转换;稀土;

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