30-mW-Class High-Power and High-Efficiency Blue Semipolar (10 1 1) InGaN/GaN Light-Emitting Diodes Obtained by Backside Roughening Technique
نویسندگان
چکیده
The first 30-mW-class semipolar blue light-emitting diode (LED) on a free-standing (10 1 1) GaN substrate has been demonstrated by using microscale periodic backside structures. The light extraction efficiency and corresponding output power were greatly enhanced, by up to 2.8-fold (bare chip) compare with conventional devices. At a driving current of 20mA, the LED showed an output power of 31.1mW and an external quantum efficiency of 54.7%. Semipolar GaN LED technology is now comparable to commercial c-plane blue LED technology, not only in terms of internal material properties but also in terms of chip processing techniques. # 2010 The Japan Society of Applied Physics
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