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Laser Liftoff GaN Thin-Film Photonic Crystal GaN-Based Light-Emitting Diodes

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6 Author(s)
Hyun Kyong Cho ; LED R&D Lab., LG Electron. Inst. of Technol., Seoul ; Sun-Kyung Kim ; Duk Kyu Bae ; Bong-Cheol Kang
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We fabricated a thin-film vertical-injection light-emitting diode (LED), which uses a highly efficient coherent external scattering of trapped light by photonic crystal (PhC). The PhC patterns (a = 1200 nm) were formed on top of the n-GaN surface after laser liftoff of the sapphire substrate. This light extraction structure just above micron scale was prepared by a conventional photolithography (lambdac = 405 nm). The Si-gel-encapsulated thin-film LED with PhC patterns (a = 1 200 nm), which had a depth of 500 nm, demonstrated up to 76% improvement in light output power at a forward current of 60 mA, compared with the nonpatterned thin film LED.

Published in:

IEEE Photonics Technology Letters  (Volume:20 ,  Issue: 24 )