Authors
JJ Wierer, MR Krames, JE Epler, NF Gardner, MG Craford, JR Wendt, JA Simmons, MM Sigalas
Publication date
2004/5/10
Journal
Applied Physics Letters
Volume
84
Issue
19
Pages
3885-3887
Publisher
American Institute of Physics
Description
Electrical operation of InGaN/GaN quantum-well heterostructure photonic crystal light-emitting diodes (PXLEDs) is demonstrated. A triangular lattice photonic crystal is formed by dry etching into the top GaN layer. Light absorption from the metal contact is minimized because the top GaN layers are engineered to provide lateral current spreading, allowing carrier recombination proximal to the photonic crystal yet displaced from the metal contact. The chosen lattice spacing for the photonic crystal causes Bragg scattering of guided modes out of the LED, increasing the extraction efficiency. The far-field radiation patterns of the PXLEDs are heavily modified and display increased radiance, up to times brighter compared to similar LEDs without the photonic crystal.
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