Abstract
We investigated the properties of flexible InGaN LEDs fabricated on a 2-in. polyimide substrate with various radii of curvature R. The output power of the LEDs slightly increased as R decreased for a given input current. The output power decreased and surface cracks appeared in the curved devices at currents larger than a critical current, although this current was smaller for devices with a smaller R. Reverse-biased electro-reflectance spectroscopy revealed that both the compressive strain in the InGaN layers and the related piezoelectric field increased as R decreased.
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