Extraction efficiency improvement of GaN light-emitting diode using sub-wavelength nanoimprinted patterns on sapphire substrate

Hao Chen, Chao Wang, Stephen Y. Chou

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The sapphire substrate with sub-wavelength pattern pitch (200 nm) was fabricated by nanoimprint and has significantly enhanced the extraction efficiency of GaN LED (λ=450 nm) -- 80% more light out than the LEDs on flat sapphire substrate that grown in the same run and better than previously-reported micro-scale patterns.

Original languageEnglish (US)
Title of host publicationOptics InfoBase Conference Papers
StatePublished - 2011
Externally publishedYes
EventCLEO: Science and Innovations, CLEO_SI 2011 - Baltimore, MD, United States
Duration: May 1 2011May 6 2011


OtherCLEO: Science and Innovations, CLEO_SI 2011
CountryUnited States
CityBaltimore, MD


ASJC Scopus subject areas

  • Instrumentation
  • Atomic and Molecular Physics, and Optics

Cite this