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Journal Article
Electrically Driven, Phosphor-Free, White Light-Emitting Diodes using Gallium Nitride-based Double Concentric Truncated Pyramid Structures
- Authors
- Seung-Hyuk Lim, Young-Ho Ko, Christophe Rodriguez, Su-Hyun Gong, Yong-Hoon Cho
- Issue Date
- 2016-02
- Citation
- Light : Science and Applications, v.5, pp.1-6
- ISSN
- 2047-7538
- Publisher
- Nature Publishing Group
- Language
- English
- Type
- Journal Article
- Abstract
- White light-emitting diodes (LEDs) are becoming an alternative general light source, with huge energy savings compared to conventional lighting. However, white LEDs using phosphor(s) suffer from unavoidable Stokes energy converting losses, higher manufacturing cost, and reduced thermal stability. Here, we demonstrate electrically driven, phosphor-free, white LEDs based on three-dimensional gallium nitride structures with double concentric truncated hexagonal pyramids. The electroluminescence spectra are stable with varying current. The origin of the emission wavelength is studied by cathodoluminescence and high-angle annular dark field scanning transmission electron microscopy experiments. Spatial variation of the carrier injection efficiency is also investigated by a comparative analysis between spatially resolved photoluminescence and electroluminescence.
- KSP Keywords
- Carrier injection, Comparative analysis, Electroluminescence spectra, Electron microscopy(SEM), Energy saving, Gallium Nitride, High-angle annular dark field scanning transmission electron microscopy(HAADF-STEM), Injection Efficiency, Light source, Spatial Variation, Spatially resolved
This work is distributed under the term of Creative Commons License (CCL)
(CC BY NC ND)
(CC BY NC ND)
