Design principles of external and internal patterns for efficient light extraction

Sun Kyung Kim, Hong Gyu Park

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We studied external and internal patterns for boosting light extraction from GaN light-emitting diodes (LEDs). With a transparent conductive layer (TCL) inserted between an external pattern and an upper GaN plane, light extraction increased in a thin, high-refractive-index TCL. A periodic array of air voids embedded in a GaN medium yielded an extraction efficiency similar to the external pattern's one. For double-layer patterns, as the internal pattern was close to multiple quantum wells within a wavelength, the extraction efficiency was enhanced ∼30% over that of a single-layer pattern. This work will be useful for designing blue-to-ultraviolet-emitting GaN-based LEDs with multi-layer patterns.

Original languageEnglish
Pages (from-to)471-475
Number of pages5
JournalJournal of the Korean Physical Society
Issue number3
Publication statusPublished - 2014 Feb

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation (NRF) of Korea grant No. 2009-0081565 funded by the Korean government Ministry of Science, Information Communications Technology, and Future Planning (MSIP).


  • Finite-difference time-domain method
  • Light-emitting diodes
  • Photonic crystal

ASJC Scopus subject areas

  • General Physics and Astronomy


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