文章基本信息

标题：Improved near-UV electroluminescence of ZnO nanorod array LEDs by coupling with a graphene plasmon layer
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作者：Cen Zhang ; Yue Qiu ; Weizhen Liu 等
期刊名称：Nanophotonics
印刷版ISSN：2192-8606
电子版ISSN：2192-8614
出版年度：2019
卷号：8
期号：12
页码：2203-2213
DOI：10.1515/nanoph-2019-0228
出版社：Walter de Gruyter GmbH
摘要：The development of short-wavelength light-emitting diodes (LEDs) with high emission efficiency, a fascinating research area, is still necessary because of great scientific interest and practical significance. Here, a graphene plasmon layer treated by oxygen plasma was employed into ZnO nanorod/p-GaN LEDs for a surface plasmon effect. The graphene-decorated heterojunction exhibited an approximately 4-fold improvement of ZnO ultraviolet (UV) electroluminescence (EL) intensity relative to a primitive p-n junction device. Time-resolved spectroscopy and temperature-dependent luminescence measurement indicated that the EL enhancement resulted from the coupling of ZnO excitons with graphene surface plasmons. The current research not only provides an opportunity to construct three-dimensional architecture from a vertical array of one-dimensional nanorods and a two-dimensional graphene layer, but also proposes an effective strategy to improve near-UV emission efficiency in various devices.
关键词：ZnO nanorod ; graphene surface plasmon ; ultraviolet LED ; p-n heterojunction