Two photoenergy conversion modes of YVO4:Eu3+ nanoparticles: Photoluminescence and photocatalytic activity
Two photoenergy conversion modes of YVO4:Eu3+ nanoparticles: Photoluminescence and photocatalytic activity
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DOI：
10.1021/acs.jpcc.5b03425
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发表时间：
2015-06
影响因子：
3.7
通讯作者：
Y. Shiraishi;Satoru Takeshita;T. Isobe
中科院分区：
文献类型：
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作者：
Y. Shiraishi;Satoru Takeshita;T. Isobe
在这项工作中，我们提出了Eu3+掺杂的YVO4作为一种显示光致发光和光催化活性的多模光能转换器的模型化合物，并讨论了这两种光能转换模式之间的关系。采用共沉淀法和离子交换法制备了不同Eu3+浓度和分布的YVO4：Eu3+纳米粒子。得到的样品由平均尺寸为20-25 nm的椭圆形纳米颗粒组成，与Eu3+的浓度和分布无关。该纳米粒子在紫外光照射下表现出两种光能转换功能：(I)Eu3+的4f→4f跃迁对应的红色光致发光和(Ii)甲基橙的光催化分解。Eu3+浓度的增加增加了光致发光量子产率，但降低了光催化活性。Eu3+离子在颗粒表面的局域化提高了光催化活性，但降低了光致发光量子产率。这些结果表明，两国之间存在着一种竞争关系。
In this work we propose Eu3+-doped YVO4 as a model compound of a multimodal photoenergy converter that shows photoluminescence and photocatalytic activity and discuss the relation between these two photoenergy conversion modes. YVO4:Eu3+ nanoparticles with different Eu3+ concentrations and distributions were prepared by coprecipitation and ion exchange methods. The obtained samples consisted of elliptical nanoparticles of 20–25 nm in mean size, irrespective of the Eu3+ concentration and distribution. The nanoparticles showed two photoenergy converting functions under UV irradiation: (i) Red photoluminescence corresponding to a 4f → 4f transition of Eu3+ and (ii) photocatalytic decomposition of methyl orange. Increase in the Eu3+ concentration increased the photoluminescence quantum yield but decreased the photocatalytic activity. Localizing Eu3+ ions at the particle surface increased the photocatalytic activity but decreased the photoluminescence quantum yield. These results imply a competitive relation b...