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Proceedings Paper

Phosphor-free white light-emitting diode using InGaN/GaN multiple quantum wells grown on microfacets
Author(s): Chu-young Cho; Il-Kyu Park; Min-Ki Kwon; Ja-Yeon Kim; Seong-Ju Park; Dong Ryul Jung; Kwang Woo Kwon
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Paper Abstract

We demonstrate phosphor-free light-emitting diode (LED) by growing InGaN/GaN multiple quantum wells (MQWs) on the n-GaN microfacets. The white emission was realized by combining emissions from InGaN/GaN MQWs grown on cplane (0001), semipolar {11-22} and {1-101} facets which are selectively grown on n-GaN with trapezoidal shape arrays. The photoluminescence (PL) and electroluminescence (EL) measurement revealed that the long wavelength light was emitted from InGaN/GaN MQWs grown on c-plane (0001), while the short wavelength light was emitted from that of semipolar microfacets. The change in the emission wavelengths from each microfacets was due to the difference in the well thickness and In composition of each MQWs. The LED showed white emission at an injection current between 180 and 230 mA. These results suggested that white emission is possible without using the phosphor by combining emission lights emitted from microfacets.

Paper Details

Date Published: 2 September 2008
PDF: 6 pages
Proc. SPIE 7058, Eighth International Conference on Solid State Lighting, 70580N (2 September 2008); doi: 10.1117/12.794575
Show Author Affiliations
Chu-young Cho, Gwangju Institute of Science and Technology (Korea, Republic of)
Il-Kyu Park, Gwangju Institute of Science and Technology (Korea, Republic of)
Min-Ki Kwon, Gwangju Institute of Science and Technology (Korea, Republic of)
Ja-Yeon Kim, Gwangju Institute of Science and Technology (Korea, Republic of)
Seong-Ju Park, Gwangju Institute of Science and Technology (Korea, Republic of)
Dong Ryul Jung, NINEX Co., Ltd. (Korea, Republic of)
Kwang Woo Kwon, NINEX Co., Ltd. (Korea, Republic of)


Published in SPIE Proceedings Vol. 7058:
Eighth International Conference on Solid State Lighting
Ian T. Ferguson; Tsunemasa Taguchi; Ian E. Ashdown; Seong-Ju Park, Editor(s)

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