Browsing by Author "Lo, Kuo-Chang"

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One-shot exposure for patterning two-dimensional photonic crystals to enhance light extraction of InGaN-based green LEDs
(2008-01-01)
Hsieh, Mei-Li
;
Lo, Kuo-Chang
;
Lan, Yi-Sheng
;
Yang, S. Y.
;
Lin, C. H.
To promote the feasibility of using photonic crystals to enhance light extraction of light-emitting diodes (LEDs) for industrial applications, the request for the high-yield and simple exposure process to pattern two-dimensional photonic crystals (2DPCs) becomes rather urgent. In this work, we developed a one-shot three-beam laser interference system-to fabricate a 2DPC on an InGaN-based green LED to address its performance for backlight display applications. Using the current exposure system we develop here, a submicro-patterned area of 6 mm in diameter can be achieved. The experimental results show that the operating voltage of a 1 x 1 mm(2) in-area LED incorporated with the 2DPC is around 4 V, and the light extraction efficiency is enhanced by a factor of 2.1.