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학술지 Electrically Driven, Phosphor-Free, White Light-Emitting Diodes using Gallium Nitride-based Double Concentric Truncated Pyramid Structures
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저자
임승혁, 고영호, Christophe Rodriguez, 공수현, 조용훈
발행일
201602
출처
Light : Science and Applications, v.5, pp.1-6
ISSN
2047-7538
출판사
Nature Publishing Group
DOI
https://dx.doi.org/10.1038/lsa.2016.30
협약과제
15MB1200, 소프트웨어 정의 네트워크(SDN) 기반 Flexible 광노드 핵심기술 개발, 권용환
초록
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.
키워드
indium gallium nitride, light-emitting diodes, phosphor-free, three-dimensional structures, white color
KSP 제안 키워드
Carrier injection, Comparative analysis, Electroluminescence spectra, Energy saving, Gallium Nitride(GaN), High-angle annular dark field scanning transmission electron microscopy, Indium Gallium Nitride(InGaN), Injection Efficiency, Light sources, Light-emitting diodes (leds), Spatial Variation