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GaN-based asymmetric two-step light-emitting diodes (LEDs) with a low indium content (LIn) InGaN shallow step was proposed and fabricated. It was found the LIn-InGaN shallow step can significantly enhance phase separation and/or inhomogeneous indium distribution in the active In0.27Ga0.73N layer. By inserting an In0.08Ga0.92N shallow step, it was found that we can enhance LED output power by a factor...
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