Directional light extraction from thin-film resonant cavity light-emitting diodes with a photonic crystal

K. Bergenek, Ch. Wiesmann, H. Zull, R. Wirth, P. Sundgren, N. Linder, K. Streubel, Thomas Fraser Krauss

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

We report directional light extraction from AlGaInP thin-film resonant cavity light emitting diodes (RCLEDs) with shallow photonic crystals (PhCs). Diffraction of guided modes into the light extraction cone enhances the light extraction by a factor of 2.6 compared to unstructured RCLEDs, where the farfields still show higher directionality than Lambertian emitters. The external quantum efficiency is 15.5% to air and 26% with encapsulation, respectively. The PhC-RCLEDs are also more stable to a temperature induced wavelength shift than unstructured RCLEDs.

Original languageEnglish
Number of pages3
JournalApplied Physics Letters
Volume93
Issue number23
DOIs
Publication statusPublished - 8 Dec 2008

Keywords

  • aluminium compounds
  • gallium compounds
  • III-V semiconductors
  • indium compounds
  • light emitting diodes
  • photonic crystals
  • thin film devices
  • EXTERNAL QUANTUM EFFICIENCY
  • SPONTANEOUS EMISSION
  • 650 NM
  • IMPACT
  • LEDS

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