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首页> 外文期刊>Journal of nano research >Blue-Shift of Ultraviolet Luminescence in Rough Surfaced ZnO Nanotubes Embedded in the AAO Template
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Blue-Shift of Ultraviolet Luminescence in Rough Surfaced ZnO Nanotubes Embedded in the AAO Template

机译：嵌入AAO模板的粗糙表面ZnO纳米管中紫外发光的蓝移

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摘要

Polycrystal ZnO nanotube arrays with outer diameter about 46 - 70 nm have been fabricated by annealing zinc oxalate in the pores of anodic aluminum oxide (AAO) template. Each nanotube is made up of small nanoparticles with the average size of 4 - 7 nm. The nanotubes embedded in the pores of AAO template constitute to a kind of quantum wells arranged alternatively by ZnO, Al2O3 and thin air layer. Rough surfaced structure increases the interactions between these layers, and enhances the quantum confinement effect. Similar to the ZnO/Al2O3 multiply layer structure, a strong near- band edge emission at about 336 nm is observed under the excitation of 220 nm. The blue shift of the near band transition originates from the raises of the Fermi level of ZnO nanotubes generated by the addition of donor Al3+. With the decrease of wall thickness, this ultraviolet peak becomes broad and stronger. Under the excitation of 380 nm, a main emission platform from 430 nm to 530 nm appears originated from the transition from conduction band tails to valence band tails contain a complex mechanical strains effected by many crystal defect. The higher energy emission properties may have potential applications for the ultraviolet light- emitting diodes and laser diodes.
机译：通过在阳极氧化铝（AAO）模板的孔中对草酸锌进行退火，制得了外径约为46-70 nm的多晶ZnO纳米管阵列。每个纳米管由平均大小为4-7 nm的小纳米颗粒组成。嵌入AAO模板孔中的纳米管构成了一种由ZnO，Al2O3和稀薄的空气层交替排列的量子阱。粗糙的表面结构增加了这些层之间的相互作用，并增强了量子限制效应。与ZnO / Al2O3多层结构相似，在220 nm的激发下观察到了约336 nm的强近带边缘发射。近带跃迁的蓝移起源于通过添加施主Al3 +产生的ZnO纳米管的费米能级的升高。随着壁厚的减小，该紫外线峰变得更宽且更强。在380 nm的激发下，出现了一个从430 nm到530 nm的主要发射平台，其起源是从导带尾到价带尾的过渡，其中包含受许多晶体缺陷影响的复杂机械应变。较高的能量发射特性可能对于紫外线发光二极管和激光二极管具有潜在的应用。

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