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首页> 外文期刊>RSC Advances >Eu3+ local site analysis and emission characteristics of novel Nd2Zr2O7:Eu phosphor: insight into the effect of europium concentration on its photoluminescence properties
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Eu3+ local site analysis and emission characteristics of novel Nd2Zr2O7:Eu phosphor: insight into the effect of europium concentration on its photoluminescence properties

机译：EU3 +局部地点分析和新型ND2ZR2O7的排放特性：EU磷光体：洞察铕浓度对光致发光性能的影响

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摘要

A new zirconate-based pyrochlore-type red phosphor, Nd _(2) Zr _(2) O _(7) :Eu ~(3+) , was synthesized using the gel-combustion method. The un-doped sample showed visible emission due to the presence of oxygen vacancies. On doping with europium ions, it was found that Eu was distributed into both Nd ~(3+) as well as Zr ~(4+) sites based on emission and lifetime spectroscopy with a lifetime value of 3.35 and 1.14 ms, respectively, although the population at the Zr ~(4+) site is more than that at the Nd ~(3+) site. This is also justified by the presence of two stark components in the ~(5) D _(0) – ~(7) F _(0) transition. The presence of host emission in the spectrum of Nd _(2) Zr _(2) O _(7) :Eu ~(3+) indicated incomplete energy transfer process at low levels of europium doping. Moreover, the efficiency of energy transfer increased as the doping percentage increased, and complete host-dopant energy transfer took place at 5.0% Eu ~(3+) doping. Based on time resolved emission spectroscopy (TRES), the emission spectrum of europium into the Nd ~(3+) sites as well as at Zr ~(4+) sites was elucidated. Calculation of the Judd–Ofelt parameter illustrated that at all europium concentration, the local surrounding area lacks inversion symmetry (asymmetric environment) and the exact point group symmetry was found to be C _(4) . The red purity and high quantum efficiency of Nd _(2) Zr _(2) O _(7) :Eu ~(3+) projects it to be a new materials for commercial application in white light emitting diodes.
机译：一种新的基于锆氨酸的曲面型红磷光体，Nd _（2）Zr _（2）O _（7）：Eu〜（3+），使用凝胶燃烧方法合成。由于存在氧气空位，未掺杂的样品显示出可见的发射。在掺杂掺杂铕离子时，发现欧盟基于发射和寿命光谱分布到Nd〜（3+）以及Zr〜（4+）位点，寿命分别为3.35和1.14ms，虽然Zr〜（4+）网站的人口超过ND〜（3+）网站的人口。这也是通过在〜（5）D _（0） - 〜（7）F _（0）转换中的两个STARK组件的存在。在Nd _（2）Zr _（2）O _（2）O _（7）的光谱中存在宿主发射：Eu〜（3+）在低水平的铕掺杂下表明了能量转移过程不完全。此外，随着掺杂百分比增加，能量转移的效率增加，并且完全宿主掺杂能量转移发生在5.0％Eu〜（3+）掺杂。基于时间分辨的发射光谱（TRES），阐明了Nd〜（3+）位点的铕的发射光谱以及Zr〜（4+）位点。所示的judd-ofelt参数的计算表明，在所有铕浓度下，局部周围区域缺乏反转对称性（不对称环境），并且发现确切的点组对称性是C _（4）。 Nd _（2）Zr _（2）O _（7）的红色纯度和高量子效率：Eu〜（3+）将其投射为白光发光二极管中商业应用的新材料。

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