Enhanced light extraction of light-emitting diodes via nano-honeycomb photonic crystals

Po Han Fu, Guan Jhong Lin, Hsin Ping Wang, Kun Yu Lai*, Jr-Hau He

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

We present an effective light extraction scheme for GaN-based multi-quantum-well (MQW) light emitting diodes with periodic SiO 2 nano-honeycomb arrays fabricated by natural lithography and reactive ion etching. The nano-honeycombs significantly boost light output by providing additional light extraction channels, not only guiding the internal modes into air but also alleviating the sever droop effect at high input power. At the driving current of 400mA, light output power through the nano-honeycombs is 77.8% higher than that of the bare device. In addition, the output power is particularly enhanced at the diffraction angle around 65°, which is attributed to the intensive first order diffraction on the honeycombs. Simulations based on finite-difference time-domain method are also carried out to reveal the field distribution across device interfaces.

Original languageEnglish (US)
Pages (from-to)78-83
Number of pages6
JournalNano Energy
Volume8
DOIs
StatePublished - Jan 1 2014

Keywords

  • Light emitting diodes
  • Light extraction
  • Multiple quantum wells
  • Nanosphere lithography
  • Photonic crystals

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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