Enhanced light output from vertical light-emitting diodes with an imprinted highly refractive polymer layer

Kyeong Jae Byeon, Hyoungwon Park, Joong Yeon Cho, Seong Hwan Lee, Sang Youl Lee, June O. Song, Heon Lee

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Hexagonal arrays of submicron polymer patterns with a high refractive index were fabricated on a vertical light-emitting diode (LED) device by means of nanoimprint lithography (NIL) to improve the light extraction efficiency. An organic-inorganic hybrid resin containing a polymeric titanium dioxide precursor was spin-coated on the n-GaN top layer of a vertical LED wafer. The coated layer was then imprinted for 10 min with an elastomeric polydimethylsiloxane stamp at 200 °C and 5 atm. The NIL process formed pillar patterns on the n-GaN layer of the vertical LED wafer. The pillar patterns have a high refractive index (n ≈ 2.0) in the visible wavelength range; they also have a diameter of 200 nm and a pitch of 700 nm. The light output power of the patterned vertical LED device is 28% greater than that of a non-patterned vertical LED device with a driving current of 350 mA. The I-V characteristics of the vertical LED device confirm that the patterning process induces no electric degradation.

Original languageEnglish
Pages (from-to)S147-S150
JournalCurrent Applied Physics
Volume11
Issue number4 SUPPL.
DOIs
Publication statusPublished - 2011 Jul

Keywords

  • Light extraction efficiency
  • Nanoimprint
  • Polymer pattern with a high refractive index
  • Vertical light-emitting diodes

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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