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Facile synthesis of BaMoO4 and BaMoO4/BaWO4 heterostructures with type -I band arrangement and enhanced photoluminescence properties
Advanced Powder Technology ( IF 5.2 ) Pub Date : 2021-09-23 , DOI: 10.1016/j.apt.2021.09.028
Yue Wang 1 , Huajing Gao 1, 2 , Shifa Wang 1, 3, 4 , Leiming Fang 4 , Xiangyu Chen 1 , Chuan Yu 1 , Shengnan Tang 1 , Hao Liu 1 , Zao Yi 5 , Hua Yang 2
Affiliation  

A series of BaMoO4 and BaMoO4/BaWO4 phosphors were successfully prepared via a polyacrylamide gel method and low temperature calcination technology. The effects of sintering temperature and mass percentage of BaMoO4/BaWO4 on the phase purity, functional group, surface morphology, charge state, photoluminescence properties and photocatalytic activity of the prepared products were studied in detail. The results indicate that the BaMoO4 phosphor is a scheelite tetragonal structure with high crystallinity. The photoluminescence spectra indicates that the phosphors have a strong blue emission peak at 440 nm with excitation wavelength of 282 nm for the BaMoO4 phosphor, and three emission peaks at 400, 440 and 460 nm with excitation wavelength of 284 nm for the BaMoO4/BaWO4 phosphors. These photoluminescence behaviors can be ascribed to the 1T21A1 transition, Jahn–Teller distorted tetrahedral symmetry of [MoO4]2- and surface defect. Photocatalytic experiments further confirmed that the BaMoO4/BaWO4 phosphors exhibit a high recombination rate of electron hole pairs. The result further indicates that the type-I band arrangement structure of BaMoO4/BaWO4 phosphors is beneficial to enhance the photoluminescent properties of single-phase phosphors. This study provides a novel route for preparing the type-I band arrangement structure composite phosphors with high photoluminescent properties and potential applications in light emitting devices, optoelectronic devices, laser devices and white pigments.



中文翻译:

BaMoO4 和 BaMoO4/BaWO4 异质结构的合成具有 I 型能带排列和增强的光致发光性能

采用聚丙烯酰胺凝胶法和低温煅烧技术成功制备了一系列BaMoO 4和BaMoO 4 /BaWO 4荧光粉。详细研究了烧结温度和BaMoO 4 /BaWO 4质量百分比对制备产物的相纯度、官能团、表面形貌、电荷态、光致发光性能和光催化活性的影响。结果表明,BaMoO 4荧光粉为白钨矿四方结构,结晶度高。光致发光光谱表明荧光粉在 440 nm 处具有强蓝色发射峰,BaMoO 4 的激发波长为 282 nmBaMoO 4 /BaWO 4磷光体在400、440和460 nm处有三个发射峰,激发波长为284 nm 。这些光致发光行为可归因于1 T 21 A 1跃迁、Jahn-Teller 扭曲的 [MoO 4 ] 2-四面体对称性和表面缺陷。光催化实验进一步证实,BaMoO 4 /BaWO 4荧光粉表现出高的电子空穴对复合率。结果进一步表明BaMoO 4 /BaWO 4的I型能带排列结构荧光粉有利于增强单相荧光粉的光致发光性能。该研究为制备具有高光致发光性能的I型能带排列结构复合荧光粉在发光器件、光电器件、激光器件和白色颜料中的潜在应用提供了一条新途径。

更新日期:2021-10-27
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