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나노 구조 물리 연구단
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Confocal electroluminescence investigations of highly efficient green InGaN LED via ZnO nanorods

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Title
Confocal electroluminescence investigations of highly efficient green InGaN LED via ZnO nanorods
Author(s)
Hyun Jeong; Mun Seok Jeong
Publication Date
2016-03
Journal
JOURNAL OF ALLOYS AND COMPOUNDS, v.660, no., pp.480 - 485
Publisher
ELSEVIER SCIENCE SA
Abstract
The light emission mechanism of green InGaN-based light-emitting diodes (LEDs) coated with ZnO nanorods (ZnO-nanorods/InGaN LEDs) was investigated by confocal scanning electroluminescence (EL) spectroscopy (CSEM). The ZnO nanorods were grown by a hydrothermal method on the surface of fully fabricated InGaN LEDs. The vertical alignment and high crystallinity of the ZnO nanorods were confirmed by scanning electron microscopy, X-ray diffraction, photoluminescence spectroscopy, micro-Raman spectroscopy, and high-resolution transmission electron microscopy. Measurement of the light output as a function of the injection current, far-field radiation pattern, and current versus voltage curves revealed that the light output power of the green InGaN LEDs with ZnO nanorods was enhanced by approximately 60% compared to that of conventional green InGaN LEDs without ZnO nanorods. However, the electrical properties of the ZnO-nanorods-coated device were not appreciably affected by the nanorods. To analyse the light emission mechanism of the ZnO-nanorods/InGaN LEDs, CSEM was used to observe the EL intensity distributions at different focal planes. (C) 2015 Elsevier B.V. All rights reserved
URI
https://pr.ibs.re.kr/handle/8788114/2545
ISSN
0925-8388
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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