Kinetic Control over YVO4:Eu3+ Nanoparticles for Tailored Structure and Luminescence Properties

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• 作者：Errui Yang ; Guangshe Li ; Jing Zheng ; Chaochao Fu ; Yunlong Zheng ; Liping Li
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：February 20, 2014
• 年：2014
• 卷：118
• 期：7
• 页码：3820-3827
• 全文大小：519K
• ISSN：1932-7455

文摘

A series of nanocrystals Y_1-xEu_xVO₄ (x = 0鈥?.1) were prepared by isothermal and isochronal hydrothermal reactions using citric acid as the capping agent. All nanocrystals were controlled to show particle sizes ranging from 7 to 36 nm, which gives rise to the grain growth kinetics in terms of an equation, D⁵ = 6.71⁵ + 2.82 脳 10¹⁰t exp(鈭?1.50/RT) for x = 0.05. Structural refinements of these nanocrystals demonstrate that as particle size reduces, there appeared an abnormal lattice expansion. The expansion rate is strikingly dependent on the substitution content of Eu³⁺ in Y_1-xEu_xVO₄. Namely, higher Eu³⁺ content led to a larger lattice expansion. With these structural changes, nanocrystals of Y_0.90Eu_0.10VO₄ were found to show the maximum luminescence performance as represented by a long lifetime of 1.33 ms. The findings reported in this work are fundamentally important, which might be extended to other doped phosphors with controlled grain growth kinetics for advanced properties.