GaN-based light-emitting diode structure with monolithically integrated sidewall deflectors for enhanced surface emission |
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Authors: | Jae-Soong Lee Joonhee Lee Sunghwan Kim Heonsu Jeon |
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Affiliation: | Sch. of Phys. & Inter-Univ. Semicond. Res. Center, Seoul Nat. Univ., South Korea; |
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Abstract: | To improve the overall surface emission efficiency, the structure of a standard GaN light-emitting diode (LED) was modified; the mesa sidewalls were etched at an angle, and deep enough to reach the sapphire substrate. Photoexcitation experiments, including photoluminescence and near- and far-field emission patterns, were performed on LED-like test devices, and results indicated that the angled sidewalls efficiently deflect photons that are initially guided laterally within the GaN epilayer in the off-surface direction. For a sidewall angle of 30/spl deg/, the total surface emission strength was improved by a factor exceeding three. Computer simulations produced results consistent with the experimental observations. |
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