Enhanced light extraction efficiency from AlGaInP thin-film light-emitting diodes with photonic crystals

K. Bergenek, Ch. Wiesmann, R. Wirth, Liam O'Faolain, N. Linder, K. Streubel, T. F. Krauss

Research output: Contribution to journalArticlepeer-review

Abstract

We investigate the use of photonic crystals for light extraction from high-brightness thin-film AlGaInP light-emitting diodes with different etch depths, lattice constants, and two types of lattices (hexagonal and Archimedean). Both simulations and experimental results show that the extraction of high order modes with a low effective index n(eff) is most efficient. The highest external quantum efficiency without encapsulation is 19% with an Archimedean A7 lattice with reciprocal lattice constant G=1.5 k(0), which is 47% better than an unstructured reference device. (C) 2008 American Institute of Physics.

Original languageEnglish
Number of pages3
JournalApplied Physics Letters
Volume93
DOIs
Publication statusPublished - 28 Jul 2008

Keywords

  • SPONTANEOUS EMISSION

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