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首页> 外文期刊>RSC Advances >Photoluminescence, photocatalysis and Judd-Ofelt analysis of Eu3+-activated layered BiOCl phosphors
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Photoluminescence, photocatalysis and Judd-Ofelt analysis of Eu3+-activated layered BiOCl phosphors

机译：EU3 + -Activated分层BioCl磷光体的光致发光，光催化和判断性分析

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Eu3+-activated layered BiOCl phosphors were synthesized by the conventional solid-state method at relatively low temperature and shorter duration (400 degrees C for 1 h). All the samples were crystallized in the tetragonal structure with the space group P4/nmm (no. 129). Field emission scanning electron microscopy (FE-SEM) studies confirmed the plate-like morphology. Photoluminescence spectra exhibit characteristic luminescent D-5(0) -> F-7(J) (J = 0-4) intra-4f shell Eu3+ ion transitions. The electric dipole transition located at 620 nm (D-5(0) -> F-7(2)) was stronger than the magnetic dipole transition located at 594 nm (D-5(0) -> F-7(1)). The evaluated Commission International de l'Eclairage (CIE) color coordinates of Eu3+-activated BiOCl phosphors were close to the commercial Y2O3:Eu3+ and Y2O2S:Eu3+ red phosphors. Intensity parameters (Omega(2), Omega(4)) and various radiative properties such as transition probability (A(tot)), radiative lifetime (tau(rad)), stimulated emission cross-section (sigma(e)), gain bandwidth (sigma(e) x Delta lambda(eff)) and optical gain (sigma(e) x tau(rad)) were calculated using the Judd-Ofelt theory. The experimental decay curves of the D-5(0) level in Eu3+-activated BiOCl have a single exponential profile. In comparison with other Eu3+ doped materials, Eu3+-activated BiOCl phosphors have a long lifetime (tau(exp)), low non-radiative relaxation rate (W-NR), high quantum efficiency (eta) and better optical gain (sigma(e) x tau(rad)). The determined radiative properties revealed the usefulness of Eu3+-activated BiOCl in developing red lasers as well as optical display devices. Further, these samples showed efficient photocatalytic activity for the degradation of rhodamine B (RhB) dye under visible light irradiation. These photocatalysts are useful for the removal of toxic and non-biodegradable organic pollutants in water.
机译：通过常规固态方法在相对低的温度和较短的持续时间（400℃，1小时400℃）通过常规固态方法合成Eu3 +活化的分层BioCl磷光体。将所有样品与空间组P4 / NMM（NO.129）中的四边形结构结晶。场发射扫描电子显微镜（Fe-SEM）研究证实了板状形态。光致发光光谱表现出特征发光D-5（0） - > F-7（J）（J = 0-4）intra-4F壳EU3 +离子转变。位于620nm（D-5（0） - > F-7（2））的电偶极转变比位于594nm（D-5（0） - > F-7（1）的磁性偶极转换强）。评估的委员会International de L'EclaReage（CIE）Eu3 + -iFtivated BioCl磷光体的颜色坐标接近商业Y2O3：Eu3 +和Y2O2s：Eu3 +红磷光体。强度参数（Omega（2），Omega（4））和各种辐射性质，如过渡概率（A（TOT）），辐射寿命（TAU（RAD）），刺激的发射横截面（Sigma（E）），增益使用Judd-elt理论计算带宽（Sigma（e）x Delta Lambda（Eff））和光学增益（Sigma（e）x tau（rad））。 EU3 + -Activated BIOCL中D-5（0）水平的实验衰减曲线具有单个指数曲线。与其它Eu3 +的比较掺杂材料，Eu3 +的活化的BiOCl荧光体具有长的寿命（TAU（EXP）），低的非辐射驰豫率（W-NR），高量子效率（ETA）和更好的光学增益（西格玛（例如）x tau（rad））。所确定的辐射性质揭示了Eu3 + -iFtivated BioCl在显影红色激光器以及光学显示装置中的有用性。此外，这些样品显示出在可见光照射下罗丹明B（RHB）染料的降解的有效光催化活性。这些光催化剂可用于去除水中有毒和非生物降解的有机污染物。

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  • 来源
    《RSC Advances》 |2015年第6期|共12页
  • 作者

    Saraf Rohit; Shivakumara C.; Behera Sukanti; Nagabhushana H.; Dhananjaya N.;

  • 作者单位

    Indian Inst Sci Solid State &

    Struct Chem Unit Bangalore 560012 Karnataka India;

    Indian Inst Sci Solid State &

    Struct Chem Unit Bangalore 560012 Karnataka India;

    Indian Inst Sci Solid State &

    Struct Chem Unit Bangalore 560012 Karnataka India;

    Tumkur Univ CNR Rao Ctr Adv Mat Tumkur 572103 India;

    BMS Inst Technol Dept Phys Bangalore 560064 Karnataka India;

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