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首页> 外文期刊>RSC Advances >Organic mediated synthesis of highly luminescent Li+ ion compensated Gd2O3:Eu3+ nanophosphors and their Judd-Ofelt analysis
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Organic mediated synthesis of highly luminescent Li+ ion compensated Gd2O3:Eu3+ nanophosphors and their Judd-Ofelt analysis

机译：有机介导的高亮度Li +离子补偿Gd2O3：Eu3 +纳米膦及其Judd-of Its分析的合成

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摘要

Highly luminescent red emitting Gd2O3:Eu3+, Li+ nanophosphor has been synthesized by the solvothermal combustion of the metal-citrate complex in diethylene glycol medium. The morphology and luminescence properties of these nanophosphors are found to be highly sensitive to the extent of lithium ion compensation. It is found that lithium ions promote grain growth and alter the morphology of the Gd2O3:Eu3+ nanophosphor from nearly spherical to cobblestone like. A significant enhancement in intensity of luminescence and quantum efficiency is observed in lithium compensated nanophosphors. The highest emission intensity is observed for the Gd1.75Eu0.1Li0.15O3 nanophosphor, about 1.83 times that of Gd1.9Eu0.1O3 and is attributed to the enhanced intra 4f-4f emission transitions arising from the modifications of the crystal field and distortion of the local symmetry around the europium ions. The luminescence decay profiles are found to be single exponential in nature and the lifetime measured was 1.36 ms for the Gd1.75Eu0.1Li0.15O3 nanophosphor. The chromaticity coordinates of these nanophosphors indicated high colour purity. Judd-Ofelt intensity parameters indicated that lithium compensation increases the polarization of the local environment and an increase of covalency and asymmetry around the europium ions.
机译：高发光的红色发射Gd2O3：Eu3 +，Li +纳米磷在二亚乙二醇介质中的金属 - 柠檬酸盐络合物的溶剂热燃烧合成。发现这些纳米膦的形态和发光特性对锂离子补偿的程度非常敏感。发现锂离子促进晶粒生长，并改变Gd2O3：Eu3 +纳米磷的形态，从几乎球形到鹅卵石等卵泡。在锂补偿纳米膦酰基中观察到发光和量子效率强度的显着增强。对于GD1.75EU0.1LI0.15O3纳米磷，约1.83倍的Gd1.9eU0.1O3的纳米次数，并且归因于晶体场的修改和变形的增强的4F-4F-4F发射转变的最高发射强度。铕离子周围的局部对称性。发现发光衰减剖面是单一指数的性质，测量的寿命为Gd1.75eU0.1LI0.15O3纳米磷的1.36ms。这些纳米磷的色度坐标表示高色纯度。 Judd-ofelt强度参数表明锂补偿增加了局部环境的极化和铕离子周围的共价和不对称的增加。

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  • 来源
    《RSC Advances》 |2016年第71期|共13页
  • 作者

    Kumar R. G. Abhilash; Hata Satoshi; Ikeda Ken-ichi; Gopchandran K. G.;

  • 作者单位

    Univ Kerala Dept Optoelect Thiruvananthapuram 695581 Kerala India;

    Kyushu Univ Dept Elect &

    Mat Sci Fac Engn Sci Fukuoka 8168580 Japan;

    Hokkaido Univ Fac Engn Div Mat Sci &

    Engn Kita Ku Kita13 Nishi8 Sapporo Hokkaido 0608628 Japan;

    Univ Kerala Dept Optoelect Thiruvananthapuram 695581 Kerala India;

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  • 正文语种 eng
  • 中图分类 化学;
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