Electrically pumped near-ultraviolet lasing from ZnO/MgO core/shell nanowires
Electrically pumped near-ultraviolet lasing from ZnO/MgO core/shell nanowires
复制标题
ZnO/MgO 核/壳纳米线电泵近紫外激光
DOI：
10.1063/1.3625925
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发表时间：
2011-08-08
影响因子：
4
通讯作者：
Mu, R.
中科院分区：
文献类型：
--
作者：
Liu, C. Y.;Xu, H. Y.;Mu, R.
在ZnO/MgO核壳纳米线的金属/绝缘体/半导体激光二极管中实现了电泵浦近紫外激光输出。与平面器件相比，纳米线二极管在相对较低的工作电流密度下显示出更高的发射强度。提高效率是由于增强激子振子强度和上级载流子传输性能的单晶ZnO纳米线，和有效的表面钝化MgO涂层。通过品质因子的计算和激光光谱的实时变化证实了激光的随机作用。结果表明，MgO涂层对纳米线异质结构起到了电子阻挡、空穴供给和表面钝化的作用。
Electrically pumped near-ultraviolet lasing was achieved in a metal/insulator/semiconductor laser diode based on ZnO/MgO core/shell nanowires. The nanowire diode shows higher emission intensity at relatively low operating current density compared with the planar device. The improved efficiency is attributed to enhanced exciton oscillator strength and superior carrier transport properties of single-crystalline ZnO nanowires, and effective surface passivation by MgO coating. Random laser action was confirmed by the calculation of quality factor and the real-time changes of lasing spectra. The results reveal that the MgO coating serves as electron blocking, hole supplying and surface passivation layer for the nanowire heterostructure.