The Penn State Research Foundation

Wenbin Zhu

Shizhuo Yin

Chang-Jiang Chen

Ju-Hung Chao

A light-emitting diode, comprising a substrate that has a first surface and an opposing second surface. A reflection layer is disposed on the first surface of the substrate and a light-emitting diode structure is arranged on the second surface of the substrate. The light-emitting diode structure includes a first semiconducting layer, an active layer and a second semiconducting layer disposed consecutively on the second surface. A plurality of protruding asymmetric micro-structured elements define at least a part of the second surface of the substrate such that at least a portion of a surface of each micro-structured element is disposed at an obtuse angle to the first surface of the substrate when measured from within the respective micro-structured element. The first semiconducting layer and the second semiconducting layer respectively have a first electrode and a second electrode.

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State College, PA, United States of America

Wenbin Zhu