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(a) Schematic diagram of a surface-textured LED coated with powder and (b) possible photon paths for a flat surface and a surface-textured structure coated with powder.
(a) Plane view SEM image of the ITO transparent layer coated with powder. Cross-sectional SEM images of surface-textured LEDs coated with the powder for etching times of (b) 50 s, (c) 100 s, (d) 200 s, (e) 300 s, and (f) 400 s, respectively.
curves of surface-textured LEDs coated with powders for different ITO-etching times.
Photographs of (a) conventional and (b) surface-textured LEDs (400 s) operated at injected currents of 20 and 100 mA.
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