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首页> 外文期刊>RSC Advances >Luminescence properties of novel emission-tunable NaSr((4-x-y))Ba-x(BO3)(3):yEu(2+) phosphors for white light emitting diodes
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Luminescence properties of novel emission-tunable NaSr((4-x-y))Ba-x(BO3)(3):yEu(2+) phosphors for white light emitting diodes

机译：新型发射可调NASR（（4-X-Y））Ba-X（BO3）（3）：白光发光二极管的yeu（2+）磷光体的发光性能

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摘要

A series of emission-tunable NaSr((4-x-y))Ba-x(BO3)(3):yEu(2+) phosphors have been prepared by a conventional solid-state reaction method. The structures of NaSr((4-x-y))Ba-x(BO3)(3):yEu(2+) have been investigated by Rietveld refinement of the X-ray diffraction (XRD) patterns. The results indicated that the as-prepared samples showed the same crystal structure of NaSr4(BO3)(3) with a cubic unit cell and space group of Ia (3) over bard. With the increase of Ba2+ concentration, the Sr2+ sites were replaced by Ba2+ completely and the lattice parameter of the unit cell increased from a = b = c = 15.0710 angstrom to 15.7266 angstrom. Both emission spectra and decay curves of NaSr3.98(BO3)(3):0.02Eu(2+) and NaBa3.98(BO3)(3):0.02Eu(2+) showed the existence of two different Eu2+ emission centers named Eu1 and Eu2. Eu2 was six-coordinated and Eu1 was eight-coordinated of oxygen. With the increase of Eu2+ concentration in the NaSr3-yBa(BO3)(3):yEu(2+) sample, the emission intensity increased and reached a maximum at y = 0.02. Then the concentration quenching phenomenon emerged due to the electric dipole-dipole interaction. Upon the cation substitutions (Sr2+ for Ba2+) in the NaSr((4-x-y))Ba-x(BO3)(3):yEu(2+) host, the emission peaks of Eu2+ blue-shifted from 609 nm to 544 nm and the thermal stability decreased, which was ascribed to the change of the covalency and the crystal field strength that the 5d orbital of the Eu2+ ion experiences. The CIE chromaticity coordinates of the obtained phosphors can be continuously tuned from orange-red (0.4795, 0.4070) to yellow-green (0.3432, 0.4665) by adjusting the Ba2+ concentration. The results demonstrate that the emission-tunable NaSr((4-x-y))Ba-x(BO3)(3):yEu(2+) phosphors have a potential application for white light emitting diodes (w-LEDs).
机译：一系列排放可调NASR（（4-X-Y））Ba-X（BO3）（3）：Yeu（2+）磷光体通过常规的固态反应方法制备。 NASR（（4-X-Y））Ba-X（BO3）（3）的结构已经通过RIETVELD改进X射线衍射（XRD）图案来研究YEU（2+）。结果表明，如制备的样品显示出与吟游诗人的立方体单元细胞和IA（3）的立方单元细胞和空间组相同的NASR4（BO3）（3）的晶体结构。随着BA2 +浓度的增加，SR2 +位点被BA2 +完全取代，并且单位电池的晶格参数从A = B = 15.0710埃造成15.7266埃的埃克斯坦。 NASR3.98（BO3）（3）（3）（3）和NaBA3.98（BO3）（3）（3）（3）（2+）的发射光谱和衰变曲线均显示出两种不同EU2 +排放中心的存在EU1和EU2。 EU2是六个协调的，EU1是氧气八次协调。随着NASR3-YBA（BO3）（3）中EU2 +浓度的增加：yeu（2+）样品，发射强度增加并在Y = 0.02达到最大值。然后由于电偶极 - 偶极相互作用而出现的浓度淬火现象。在NASR（（4-XY））Ba-X（BO3）（3）中的阳离子取代（Ba2 +）中的阳离子取代（SR2 +）：Yeu（2+）宿主，Eu2 +蓝移到609nm至544nm的发射峰热稳定性降低，这归因于欧盟2 +离子经验的5D轨道的共和度和晶体场强的变化。所得磷光体的CIE色度坐标可以通过调节Ba2 +浓度从橙红色（0.4795,0.4070）到黄绿色（0.3432,0.4665）连续调谐。结果表明，排放可调NASR（（4-X-Y））Ba-X（BO3）（3）：Yeu（2+）磷光体对白光发光二极管（W-LED）具有潜在的应用。

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  • 来源
    《RSC Advances》 |2015年第104期|共9页
  • 作者

    Huang Jun; Dai Jian; Deng Degang; Yu Hua; Li Yinqun; Hua Youjie; Zhao Shilong; Li Chenxia; Xu Shiqing;

  • 作者单位

    China Jiliang Univ Coll Mat Sci &

    Engn Hangzhou 310018 Peoples R China;

    China Jiliang Univ Coll Mat Sci &

    Engn Hangzhou 310018 Peoples R China;

    China Jiliang Univ Coll Mat Sci &

    Engn Hangzhou 310018 Peoples R China;

    Hangzhou Dianzi Univ Coll Mat &

    Environm Engn Hangzhou 310018 Peoples R China;

    China Jiliang Univ Coll Mat Sci &

    Engn Hangzhou 310018 Peoples R China;

    China Jiliang Univ Coll Mat Sci &

    Engn Hangzhou 310018 Peoples R China;

    China Jiliang Univ Coll Mat Sci &

    Engn Hangzhou 310018 Peoples R China;

    China Jiliang Univ Coll Mat Sci &

    Engn Hangzhou 310018 Peoples R China;

    China Jiliang Univ Coll Mat Sci &

    Engn Hangzhou 310018 Peoples R China;

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