High-gravity-assisted green synthesis of rare-earth doped calcium molybdate colloidal nanophosphors
High-gravity-assisted green synthesis of rare-earth doped calcium molybdate colloidal nanophosphors
复制标题
高重力辅助绿色合成稀土掺杂钼酸钙胶体纳米荧光粉
DOI：
10.1016/j.cjche.2020.03.023
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发表时间：
2020-06-01
影响因子：
3.8
通讯作者：
Wang, Dan
中科院分区：
文献类型：
--
作者：
Pu, Yuan;Lin, Lifeng;Wang, Dan
在这项工作中，我们报告了一种创新的路线，合成稀土掺杂钼酸钙（CaMoO4）纳米荧光粉采用高重力旋转填充床（RPB）技术，石蜡液体为溶剂。RPB反应器中反应物的传质增强和微混合有利于稀土离子在主体材料中均匀掺杂，从而制备出具有高量子效率的纳米荧光粉。使用液体石蜡作为溶剂消除了与挥发性有机化合物相关的安全风险，增加了纳米荧光粉清洁生产的潜力。在深紫外（DUV）光激发下，CaMoO4:Na+， Eu3+纳米荧光粉在峰值波长615 nm处表现出红色发射，量子产率高达35.01%。CaMoO4:Na+，Tb3+纳米荧光粉在峰值波长543 nm处表现出绿色发光，量子产率高达30.66%。在实验结果和介观科学理论分析的基础上，提出了纳米荧光粉从纳米纤维、纳米棒到纳米点的形态可调控的可能机制。这些纳米荧光粉在有机溶剂中高度分散，并用于制造基于硅树脂的柔性独立式发光薄膜。我们还展示了由CaMoO4:Na+，Eu3+纳米颗粒混合薄膜组成的红色led作为颜色转换荧光粉和DUV led作为照明光源，为未来基于纳米荧光粉的固态照明系统提供了强大的潜力。（三）2020中国化学工业与工程学会、化学工业出版社股份有限公司版权所有。
In this work, we report an innovative route for the synthesis of rare-earth doped calcium molybdate (CaMoO4) nanophosphors by using high gravity rotating packed bed (RPB) technology and paraffin liquid as the solvent. The significant intensified mass transfer and micromixing of reactants in the RPB reactor are benefiting for homogeneous doping of rare-earth ions in the host materials, leading to nanophosphors with high quantum efficiency. The use of liquid paraffin as the solvent eliminates the safety risks associated with volatile organic compounds, increasing the potential for clean production of nanophosphors. Under excitation of deep ultraviolet (DUV) light, the CaMoO4:Na+, Eu3+ nanophosphors exhibit red emission at peak wavelength of 615 nm and quantum yield of up to 35.01%. The CaMoO4:Na+,Tb3+ nanophosphors exhibit green emission at peak wavelength of 543 nm with quantum yield of up to 30.66%. The morphologies of the nanophosphors are tunable from nanofibers through nanorods to nanodots and the possible mechanism of controlling the formation of different nanostructures is proposed on the basis of experimental results and theoretical analysis of mesoscience. These nanophosphors are highly dispersible in organic solvents and utilized for fabricating fabrication of flexible, freestanding luminescent films based on silicone resin. We also demonstrate the red LEDs consisting of the hybrid films of CaMoO4:Na+,Eu3+ nanoparticles as color-converting phosphors and DUV LEDs as illuminators, offering strong potential for future nanophosphors-basedsolid-state lighting systems. (C) 2020 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.