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

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


We present an effective light extraction scheme for GaN-based multi-quantum-well (MQW) light emitting diodes with periodic SiO2 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
Pages (from-to)78-83
Number of pages6
JournalNano Energy
StatePublished - Sep 2014


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


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