| Violet-blue LEDs based on p-GaN/n-ZnO nanorods and their stability. | |
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MedLine Citation:
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PMID: 21508502 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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In this paper, we report a fabrication, characterization and stability study of p-GaN/n-ZnO nanorod heterojunction light-emitting devices (LEDs). The LEDs were assembled from arrays of n-ZnO vertical nanorods epitaxially grown on p-GaN. LEDs showed bright electroluminescence in blue (440 nm), although weaker violet (372 nm) and green-yellow (550 nm) spectral components were also observed. The device characteristics are generally stable and reproducible. The LEDs have a low turn-on voltage (∼5 V). The electroluminescence (EL) is intense enough to be noticed by the naked eye, at an injection current as low as ∼ 40 µA (2.1 × 10( - 2) A cm( - 2) at 7 V bias). Analysis of the materials, electrical and EL investigations point to the role of a high quality of p-n nano-heterojunction which facilitates a large rectification ratio (320) and a stable reverse current of 2.8 µA (1.4 × 10( - 3) A cm( - 2) at 5 V). Stability of EL characteristics was investigated in detail. EL intensity showed systematic degradation over a short duration when the LED was bias-stressed at 30 V. At smaller bias (<20 V) LEDs tend to show a stable and repeatable EL characteristic. Thus a simple low temperature solution growth method was successfully exploited to realize nanorod/film heterojunction LED devices with predictable characteristics. |
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Authors:
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Shrawan Jha; Jin-Cheng Qian; Oleksandr Kutsay; Jaroslav Kovac Jr; Chun-Yan Luan; Juan Antonio Zapien; Wenjun Zhang; Shuit-Tong Lee; Igor Bello |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-4-21 |
Journal Detail:
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Title: Nanotechnology Volume: 22 ISSN: 1361-6528 ISO Abbreviation: - Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-4-21 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101241272 Medline TA: Nanotechnology Country: - |
Other Details:
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Languages: ENG Pagination: 245202 Citation Subset: - |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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