Confocal electroluminescence investigations of highly efficient green InGaN LED via ZnO nanorods
- Authors
- Jeong, Hyun; Jeong, Mun Seok
- Issue Date
- Mar-2016
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Luminescence; Nanofabrications; Nanostructured materials; Nitride materials; Optical spectroscopy; Scanning electron microscopy
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v.660, pp.480 - 485
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF ALLOYS AND COMPOUNDS
- Volume
- 660
- Start Page
- 480
- End Page
- 485
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/154933
- DOI
- 10.1016/j.jallcom.2015.11.151
- ISSN
- 0925-8388
- 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.
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