Enhanced light extraction by photonic quasi-crystals in GaN blue LEDs

Philip A. Shields, Martin D. B. Charlton, Tom Lee, Majd E. Zoorob, Duncan W. E. Allsopp, Wang Nang Wang

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The far-field profile of photonic quasi-crystal patterned and unpatterned LEDs, fabricated from commercial epitaxial substrates by electron beam lithography, has been measured prior to lapping and dicing. Emission enhancements reach a maximum of 62%, and are strongly dependent on the filling factor. Qualitative agreement is achieved between 2-D finite-difference time-domain calculations and the experimental data.
Original languageEnglish
Pages (from-to)1269-1274
Number of pages6
JournalIEEE Journal of Selected Topics in Quantum Electronics
Issue number4
Early online date18 May 2009
Publication statusPublished - Jul 2009


  • Finite difference time domain method
  • Light emission
  • Photonic crystals
  • Light
  • Electroluminescence
  • Electron beams


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