College of Chemistry, Chemical Engineering and Materials Science , Soochow University , Suzhou 215123 , China.
Department of Physics and Interdisciplinary Program of Biomedical Engineering , Pukyong National University , Busan 608-737 , Republic of Korea.
Inorg Chem. 2019 Oct 7;58(19):13161-13169. doi: 10.1021/acs.inorgchem.9b02037. Epub 2019 Sep 9.
LiBaPO:Eu phosphor and Ag-coated LiBaPO:Eu composites (Ag/LiBaPO:Eu) were prepared via solid-state reaction and traditional photoreduction methods, respectively. The samples were characterized via XRD, SEM, and UV-vis optical absorption spectroscopy. Two photoenergy conversion processes, namely, photocatalysis and photoluminescence, were investigated in detail. In comparison with as-prepared LiBaPO:Eu phosphor, Ag-modified composites exhibited the enhanced photocatalytic effects together with the quenched Eu luminescence. A Schottky barrier was created on the interface between Ag nanoparticles and LiBaPO host, thereby greatly delaying the recombination between the light-induced holes and electrons. A photoenergy conversion mechanism was suggested and discussed on the basis of the experiments. The Eu ion luminescence centers directly participated in the photodegradation with the meditation of Ag nanoparticles on the surface. With the increase of the Ag coating level on the surfaces, some emission peaks corresponding to D → F transitions of Eu ions were detected. Eu/Eu couples also play an important role in improving photocatalysis. LiBaPO:Eu phosphor is a good candidate for the investigation of multimodal photoenergies of photoluminescence and photocatalysis.
通过固态反应和传统光还原法分别制备了 LiBaPO:Eu 荧光粉和 Ag 包覆的 LiBaPO:Eu 复合材料（Ag/LiBaPO:Eu）。采用 XRD、SEM 和紫外可见吸收光谱对样品进行了表征。详细研究了两种光能转换过程，即光催化和光致发光。与制备的 LiBaPO:Eu 荧光粉相比，Ag 修饰的复合材料表现出增强的光催化效应，同时Eu 发光被猝灭。Ag 纳米粒子和 LiBaPO 宿主之间形成肖特基势垒，从而大大延迟了光诱导空穴和电子的复合。基于实验提出并讨论了一种光能量转换机制。Eu 离子发光中心在 Ag 纳米粒子表面的介导下直接参与光降解。随着表面 Ag 涂层水平的增加，检测到一些对应于 Eu 离子的 D → F 跃迁的发射峰。Eu/Eu 对在提高光催化性能方面也起着重要作用。LiBaPO:Eu 荧光粉是研究光致发光和光催化多模态光能的良好候选材料。
