Green, yellow, and orange defect emission from ZnO nanostructures: Influence of excitation wavelength
Green, yellow, and orange defect emission from ZnO nanostructures: Influence of excitation wavelength
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DOI：
10.1063/1.2182096
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发表时间：
2006-03-06
影响因子：
4
通讯作者：
Gwo, S
中科院分区：
文献类型：
--
作者：
Djurisic, AB;Leung, YH;Gwo, S
ZnO由于不同的本征缺陷，通常在可见光谱范围内表现出发光。为了研究缺陷发射，通过不同的方法（针，棒，壳）制备的ZnO纳米结构的光致发光作为激发波长和温度的函数进行了测量。在325 nm激发下，针状体呈现橙红色缺陷发射，棒状体呈现黄色缺陷发射，而壳层呈现绿色缺陷发射。随着激发波长的增加，观察到针从橙子到绿色的明显颜色变化，而纳米棒（黄色）显示出较小的波长偏移，壳（绿色）没有显示出显著的光谱偏移。不同的波长依赖性的原因进行了讨论。
ZnO commonly exhibits luminescence in the visible spectral range due to different intrinsic defects. In order to study defect emissions, photoluminescence from ZnO nanostructures prepared by different methods (needles, rods, shells) was measured as a function of excitation wavelength and temperature. Under excitation at 325 nm, needles exhibited orange-red defect emission, rods exhibited yellow defect emission, while shells exhibited green defect emission. Obvious color change from orange to green was observed for needles with increasing excitation wavelengths, while nanorods (yellow) showed smaller wavelength shift and shells (green) showed no significant spectral shift. Reasons for different wavelength dependences are discussed.