Synthesis and Luminescence Properties of YNbO4:A (A = Eu3+ and/or Tb3+) Nanocrystalline Phosphors via a Sol鈥揋el Process

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• 作者：Xiaoming Liu ; Ying L眉 ; Chen Chen ; Shenglian Luo ; Yuehua Zeng ; Xiaoqian Zhang ; Mengmeng Shang ; Chunxia Li ; Jun Lin
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：November 26, 2014
• 年：2014
• 卷：118
• 期：47
• 页码：27516-27524
• 全文大小：661K
• ISSN：1932-7455

文摘

Rare-earth (Eu³⁺ and/or Tb³⁺) ions doped YNbO₄ phosphors were prepared though a Pechini-type sol鈥揼el process. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy, photoluminescence, and cathodoluminescence spectra were utilized to characterize the synthesized phosphors. XRD reveal that the samples begin to crystallize at 800 掳C and pure YNbO₄ phase can be obtained at 1000 掳C. FE-SEM images indicate that the YNbO₄:A (A = Eu³⁺ and/or Tb³⁺) samples consist of fine and spherical grains of around 40鈥?0 nm. Under the ultraviolet light (around 255 nm) and low-voltage electron beams, the prepared YNbO₄:A (A = Eu³⁺ and/or Tb³⁺) phosphors show the characteristic blue broadband emission (from 300 to 500 nm with a maximum around 403 nm) of the YNbO₄ host lattice, the characteristic red emission of Eu³⁺ (⁵D_J 鈫?⁷F_{J鈥?/sub>, J, J鈥?= 0,1,2,3 transitions) and the characteristic green emission of Tb³⁺ (⁵D4 鈫?⁷F6,5,4,3 transitions). There exists an energy transfer from the YNbO4 host lattices to Eu³⁺ (Tb³⁺) ions. By tuning the relative doping concentration of Eu³⁺ and Tb³⁺, a single-composition white-light-emitting has been realized in YNbO4:Eu³⁺,Tb³⁺ phosphor. The obtained YNbO4:Eu³⁺, YNbO4:Tb³⁺, and YNbO4:Eu³⁺,Tb³⁺ phosphors have potential application in the areas of UV white-light-emitting diodes, field emission display devices, and vacuum fluorescent display devices, etc.}