Light extraction enhancement of vertical LED by growing ZnO nano-rods on tips of pyramids

Yen Ju Wu, Yen Shuo Liu, Chih Yi Hsieh, Po Ming Lee, Yu Shan Wei, You Hsien Chang, Kun Yu Lai, Cheng Yi Liu

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Creating a pyramidal structure on an n-GaN surface is considered the most effective approach for maximizing light extraction of n-side-up GaN-based light-emitting diodes (LEDs). This letter shows that the light extraction efficiency of a pyramidal n-GaN surface can be further enhanced by growing ZnO nano-rods (NRs) specifically on the tips of the pyramids on the n-GaN surface. Using tip-only ZnO NRs, the light-output power of an n-side-up LED with a pyramidal n-GaN surface can be further enhanced by 49.6% at 250 mA. This improved light extraction efficiency is due to the multiple facets on the ZnO NRs.

Original languageEnglish
Article number6573355
Pages (from-to)1774-1777
Number of pages4
JournalIEEE Photonics Technology Letters
Volume25
Issue number18
DOIs
StatePublished - 2013

Keywords

  • Hydrothermal
  • ZnO
  • nano-rods
  • nanotechnology
  • surface roughening

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