| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1641638 | Materials Letters | 2016 | 5 Pages |
•We investigated the properties of flexible InGaN LEDs with various curvatures R.•The output power of the LEDs slightly increased as R decreased.•The output power decreased at currents larger than a critical current.•This critical current was smaller for devices with a smaller R.•The compressive strain and the piezoelectric field increased as R decreased.
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.
