Electrically driven, phosphor-free, white light-emitting diodes using gallium nitride-based double concentric truncated pyramid structures

Seung-Hyuk Lim; Young-Ho Ko; Christophe Rodriguez; Su-Hyun Gong; Yong-Hoon Cho

doi:10.1038/lsa.2016.30

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Electrically driven, phosphor-free, white light-emitting diodes using gallium nitride-based double concentric truncated pyramid structures

Original Articles

- Electrically driven, phosphor-free, white light-emitting diodes using gallium nitride-based double concentric truncated pyramid structures
- Light: Science & Applications Vol. 5, Issue 1, (2016)
- Affiliations：
  
  1.Department of Physics and KI for the NanoCentury, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea
  2.Present address: Electronics and Telecommunications Research Institute (ETRI), 218 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea
  3.Present address: The Laboratoire Nanotechnologies Nanosystemes (LN2) - CNRS UMI-3463, Institut Interdisciplinaire d'Innovation Technologique (3IT), Université de Sherbrooke, 3000 boulevard Université, J1K 0A5, QC, Canada
- Author bio：
  
  YH Cho, Email: yhc@kaist.ac.kr
- Funds：
- DOI：10.1038/lsa.2016.30
  CLC：
- Published：2016-03，
  
  Published Online：26 September 2015，
  
  Received：14 May 2015，
  
  Revised：18 September 2015，
  
  Accepted：25 September 2015
- Accepted：
Scan QR Code
Lim, S. H. et al. Electrically driven, phosphor-free, white light-emitting diodes using gallium nitride-based double concentric truncated pyramid structures. Light: Science & Applications, 5, e16030 (2016).
DOI：

Lim, S. H. et al. Electrically driven, phosphor-free, white light-emitting diodes using gallium nitride-based double concentric truncated pyramid structures. Light: Science & Applications, 5, e16030 (2016). DOI： 10.1038/lsa.2016.30.

摘要

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.

关键词

Keywords

indium gallium nitridelight-emitting diodesphosphor-freethree-dimensional structureswhite color

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