Journal
APPLIED PHYSICS LETTERS
Volume 84, Issue 6, Pages 855-857Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1645992
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Roughened surfaces of light-emitting diodes (LEDs) provide substantial improvement in light extraction efficiency. By using the laser-lift-off technique followed by an anisotropic etching process to roughen the surface, an n-side-up GaN-based LED with a hexagonal conelike surface has been fabricated. The enhancement of the LED output power depends on the surface conditions. The output power of an optimally roughened surface LED shows a twofold to threefold increase compared to that of an LED before surface roughening. (C) 2004 American Institute of Physics.
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