Three-Dimensional Branched Nanowire Heterostructures as Efficient Light-Extraction Layer in Light-Emitting Diodes
SCIE
SCOPUS
- Title
- Three-Dimensional Branched Nanowire Heterostructures as Efficient Light-Extraction Layer in Light-Emitting Diodes
- Authors
- Byeong Uk Ye; Buem Joon Kim; Joonmo Park; Hu Young Jeong; Jae Yong Park; Kim, JK; Jin-Hoe Hur; Myung Hwa Kim; Lee, JL; Jeong Min Baik
- Date Issued
- 2014-06
- Publisher
- WILEY-VCH
- Abstract
- A facile method to fabricate three-dimensional branched ZnO/MgO nanowire heterostructures and their application as the efficient light-extraction layer in light-emitting diodes are reported. The branched MgO nanowires are produced on the hydrothermally-grown ZnO nanowires with a small tapering angle towards the tip (approximate to 6 degrees), by the oblique angle flux incidence of MgO. The structural evolution during the growth verifies the formation of the MgO nanoscale islands with strong (111) preferred orientation on very thin (5-7 nm) MgO (110) layer. The MgO nanobranches, then grown on the islands, are polycrystalline consisting of many grains oriented in specific directions of <200> and <220>, supported by the nucleation theory. The LEDs with the branched ZnO/MgO nanowire arrays show a remarkable enhancement in the light output power by 21% compared with that of LEDs with pristine ZnO nanowires. Theoretical calculations using a finite-difference time-domain method reveal that the nanostructure is very effective in breaking the wave-guiding mode inside the ZnO nanowires, extracting more light especially in radial direction through the MgO nanobranches.
- Keywords
- 3D branched nanowires; hydrothermal growth; oblique angle deposition; light emission; LEDs; SINGLE-PHOTON SOURCES; NANOSTRUCTURES; NANORODS; GROWTH; ENHANCEMENT; EPITAXY
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/13784
- DOI
- 10.1002/ADFM.201303914
- ISSN
- 1616-301X
- Article Type
- Article
- Citation
- Advanced Functional Materials, vol. 24, no. 22, page. 3384 - 3391, 2014-06
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