Light extraction enhancement of GaN-based LEDs through passive/active photon recycling

Ching Cherng Sun, Tsung Xian Lee, Yi Chien Lo, Cheng Chien Chen, Shang Yu Tsai

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


In this paper, we present a study of light extraction of GaN-based LEDs through active/passive photon recycling, including sapphire-based and Thin-GaN based on Monte Carlo ray tracing. The mechanisms in enhancing light extraction incorporated with implanting micro pyramid (lens) array and lens encapsulation of both cavity photon recycling and quantum photon recycling are discussed. For an absorption coefficient of 200 cm- 1 in the active layer, both approaches perform more than 90% of light extraction efficiency through cavity photon recycling. For a heavy absorbed active layer, the quantum photon recycling could play an important role in light extraction.

Original languageEnglish
Pages (from-to)4862-4868
Number of pages7
JournalOptics Communications
Issue number20
StatePublished - 15 Sep 2011


  • GaN
  • Light emitting diode
  • Light extraction
  • Photon recycle


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