Synthesis and Luminescence Properties of YNbO4:A (A = Eu3+ and/or Tb3+) Nanocrystalline Phosphors via a Sol-Gel Process
Synthesis and Luminescence Properties of YNbO4:A (A = Eu3+ and/or Tb3+) Nanocrystalline Phosphors via a Sol-Gel Process
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溶胶凝胶法合成 YNbO4:A（A = Eu3 和/或 Tb3）纳米晶荧光粉及其发光性能
DOI：
10.1021/jp508773t
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发表时间：
2014-11-27
影响因子：
3.7
通讯作者：
Lin, Jun
中科院分区：
文献类型：
--
作者：
Liu, Xiaoming;Lu, Ying;Lin, Jun
采用Pechini型溶胶-凝胶法制备了稀土离子（Eu 3+和Tb 3+）掺杂的YNbO 4荧光粉。利用X射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）、透射电子显微镜、光致发光和阴极发光光谱对合成的荧光粉进行了表征。XRD分析表明，样品开始晶化温度为800 ℃，晶化温度为1000 ℃时可得到纯相YNbO 4。FE-SEM图像表明，YNbO 4：A（A = Eu 3+和/或Tb 3+）样品由4080 nm左右的细小球形晶粒组成。在紫外光（255 nm附近）和低压电子束照射下，制备的YNbO 4：A（A = Eu 3+和/或Tb 3+）荧光粉显示出YNbO 4基质晶格的特征蓝光宽带发射（300 ~ 500 nm，最大值在403 nm附近）、Eu 3+的特征红光发射（D-5（J）-> 7 F（J = 0，1，2，3跃迁）和Tb 3+的特征绿色发射（5D（4）？7 F（6，5，4，3）跃迁）。存在从YNbO_4基质晶格到Eu ~（3+）（Tb ~（3+））离子的能量转移。通过调节Eu ~（3+）和Tb ~（3+）的相对掺杂浓度，实现了YNbO_4：Eu ~（3+），Tb ~（3+）单组分白光发光。所制备的YNbO 4：Eu 3+、YNbO 4：Tb 3+和YNbO 4：Eu 3+，Tb 3+荧光粉在紫外白光发光二极管、场发射显示器件和真空荧光显示器件等领域具有潜在的应用前景。
Rare-earth (Eu3+ and/or Tb3+) ions doped YNbO4 phosphors were prepared though a Pechini-type solgel 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 degrees C and pure YNbO4 phase can be obtained at 1000 degrees C. FE-SEM images indicate that the YNbO4:A (A = Eu3+ and/or Tb3+) samples consist of fine and spherical grains of around 4080 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+ (D-5(J) -> 7F(J)', J, J' = 0,1,2,3 transitions) and the characteristic green emission of Tb3+ (5D(4) ? 7F(6,5,4,3) 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.