4 March 2013 Polychromatic white LED using GaN nano pyramid structure
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Abstract
We have developed monolithic white light emitting diodes (LEDs) with a hybrid structure of planar c-planes and nano size hexagonal pyramids. The white spectrum is composed of blue and yellow emissions from the InGaN multi quantum wells (MQWs) on the planar c-planes and on the nano pyramids, respectively. The yellow emission is originated from quantum wells, wires, and dots that are formed at the sides, edges, and tops of the nano-pyramids, respectively. As a result, the emission peaks are different and the entire yellow spectrum is broad enough to make a white in combination with a blue emission. The longer wavelength from the InGaN on nano-pyramids than the wavelength from the InGaN on c-planes is explained by excess In supply from the dielectric selective growth mask. The color temperature is tuned from 3600K to 6400K by controlling the relative area ratio of c-plane and nano-pyramids.
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Taek Kim, Jusung Kim, Moonseung Yang, Yongsoo Park, U-In Chung, Yongho Ko, Yonghoon Cho, "Polychromatic white LED using GaN nano pyramid structure", Proc. SPIE 8641, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVII, 86410E (4 March 2013); doi: 10.1117/12.2006561; https://doi.org/10.1117/12.2006561
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