Greenish-Yellow Emission from Dy3+-Doped Y2O3 Nanophosphors
Greenish-Yellow Emission from Dy3+-Doped Y2O3 Nanophosphors
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DOI：
10.1111/j.1551-2916.2009.03426.x
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发表时间：
2010-02-01
影响因子：
3.9
通讯作者：
Moorthy, L. Rama
中科院分区：
文献类型：
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作者：
Jayasimhadri, M.;Ratnam, B. V.;Moorthy, L. Rama
以甘氨酸为燃料，采用燃烧合成法制备了三价镝掺杂的立方相氧化钇（Y2 O3）纳米荧光粉。通过拉曼光谱和红外光谱对产物进行了表征，分析了样品的振动特性。X射线衍射图谱证实了纯立方相Y2 O3的形成。使用透射电子显微镜（TEM）和场发射扫描电子显微镜的形态和选区电子衍射测量进行。从TEM观察到，所制备的颗粒具有约23 nm的平均微晶尺寸。研究了Y_2O_3：Dy ~（3+）的发光和动力学性质随温度和Dy ~（3+）浓度的变化。荧光光谱研究表明，在575 nm处有较强的F-4（9/2）-> H-6（13/2）跃迁，在488 nm处有较弱的F-4（9/2）-> H-6（15/2）跃迁。结果表明，不同的加热温度对发射带的相对发光强度有不同的影响，但对黄绿色的发光以及从发射光谱中提取的Commission International d 'Eclairage色品坐标没有明显的影响。Y2 O3：Dy 3+磷光体的强绿-黄发射可用于用于一般照明目的的固态白色灯中的应用。
Trivalent dysprosium-doped cubic yttrium oxide (Y2O3) nanophosphors were prepared by combustion synthesis using glycine as fuel. The resulting products were characterized by Raman and FT-IR spectra to evaluate the vibrational features of the samples. X-ray diffraction patterns confirmed the formation of a pure cubic phase of Y2O3. The morphology and selective area electron diffraction measurements were carried out using transmission electron microscopy (TEM) and field-emission scanning electron microscopy. From TEM, it is observed that as-prepared particles have average crystallite sizes of around 23 nm. The luminescent and dynamic properties of Y2O3:Dy3+ were examined as a function of temperature and different concentrations of Dy3+. The luminescence study reveals that these phosphors predominantly exhibit greenish-yellow emission due to strong F-4(9/2)-> H-6(13/2) transition at 575 nm and a feeble F-4(9/2)-> H-6(15/2) transition at 488 nm. These results show that the relative luminescence intensity of emission bands changes with different heating temperatures, while the greenish yellow color luminescence as well as Commission International d'Eclairage chromaticity coordinates extracted from the emission spectra were not affected significantly. The strong greenish-yellow emission of Y2O3:Dy3+ phosphor may be useful for applications in solid-state white lamps for general illumination purposes.