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

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

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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.

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《光：科学与应用（英文版）》 |2016年第1期|123-128|共6页
作者
Seung-Hyuk Lim; Young-Ho Ko; Christophe Rodriguez; Su-Hyun Gong; Yong-Hoon Cho;
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Department of Physics and KI for the NanoCentury, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea;

Department of Physics and KI for the NanoCentury, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea;

Electronics and Telecommunications Research Institute(ETRI), 218 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea;

Department of Physics and KI for the NanoCentury, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea;

The Laboratoire Nanotechnologies Nanosystemes(LN2)-CNRS UMI-3463, Institut Interdisciplinaire d'Innovation Technologique(3IT), Université de Sherbrooke, 3000 boulevard Université, J1K OA5, QC, Canada;

Department of Physics and KI for the NanoCentury, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea;

Department of Physics and KI for the NanoCentury, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea;

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

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