Investigation of the structural and photoluminescence properties of Ce3+-doped LuAG nanopowders prepared via sol–gel method
Investigation of the structural and photoluminescence properties of Ce3+-doped LuAG nanopowders prepared via sol–gel method
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DOI：
10.1016/j.optmat.2014.11.039
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发表时间：
2015-02
影响因子：
3.9
通讯作者：
A. Boukerika;L. Guerbous
中科院分区：
文献类型：
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作者：
A. Boukerika;L. Guerbous
采用溶胶-凝胶法很好地合成了 Ce3+ 活化镥铝石榴石纳米粉体 (LuAG:Ce3+)。研究并讨论了Ce3+浓度（0.1 at.%、0.5 at.%、1.0 at.%和2.0 at.%）和退火温度对结构和发光性能的影响。通过差示扫描量热法 (DSC)、X 射线衍射技术 (XRD)、傅里叶变换红外光谱 (FTIR) 和光致发光光谱 (PL) 对所得 LuAG:Ce3+ 纳米粉末进行了表征。 DSC 分析表明 LuAG 结晶温度约为 960 °C。 X射线衍射分析表明LuAG晶相为立方晶相。通过增加 Ce3+ 掺杂浓度，我们意识到平均晶粒尺寸会减小，而通过提高退火温度，它们的平均尺寸会增加。此外，晶格应变值随着微晶尺寸的增加而减小。室内光致发光光谱显示出在 450–700 nm 范围内的强宽绿-黄发射带，这是 Ce3+ 离子 5d → 4f (2F5/2,2F7/2) 跃迁的特征。结果发现，最低的 Ce3+ 浓度 (0.1 at.%) 呈现出最高的发光强度。研究了微晶尺寸对发光光谱参数的影响。
Ce3+activated lutetium aluminum garnet nanopowders (LuAG:Ce3+) have been well synthesized using sol–gel method. Both of the effect of Ce3+concentrations (0.1 at.%, 0.5 at.%, 1.0 at.% and 2.0 at.%) and annealing temperature on the structural and luminescence properties were studied and discussed. The resulting LuAG:Ce3+nanopowders were characterized by the Differential Scanning Calorimetry (DSC), X-ray diffraction technique (XRD), Fourier transforms infrared spectroscopy (FTIR) and photoluminescence spectroscopy (PL). The DSC analyses have shown that LuAG crystallization temperature is around 960 °C. X-ray diffraction analysis indicated that LuAG crystalline phase was formed as cubic one. By increasing Ce3+doping concentration we realized that average crystallite size decreases and by increasing the annealing temperature their average size has increased. Moreover, the lattice strain values have diminished during the increase of crystallite size. Room photoluminescence spectra revealed a strong broad green–yellow emission band in the range of 450–700 nm, characteristic to the 5d → 4f (2F5/2,2F7/2) transitions of Ce3+ion. It was found that the lowest Ce3+concentration (0.1 at.%) present the highest luminescence intensity. The effect of crystallite size on the luminescence spectroscopic parameters was investigated.