Enhanced light emission of nano-patterned GaN via block copolymer thin films

Yo Han Cho, Kyunghee Lee, Kyunghoon Kim, Kwang Hyun Baik, Jinhan Cho, Jihyun Kim, Kyusoon Shin, Joona Bang

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We demonstrate that the nanoscopic block copolymer patterns on GaN can enhance light extraction efficiency of GaN-based light emitting diodes. Nanoporous patterns were fabricated on a bare GaN substrate via self-assembly of poly(styrene-b-methyl methacrylate) block copolymers from which PMMA microdomains were selectively removed later on. A bare GaN surface was treated with a photo-crosslinkable thin layer of poly(styrene-r-methyl methacrylate) random copolymers to tune the cylindrical microdomain orientations. The nanoporous block copolymer thin film was controlled to be thicker than its typical repeat period in bulk by incorporating PMMA homopolymer into block copolymer. Consequently, the light extraction efficiency in photoluminescence spectra could be tuned with the thickness of nanopatterned thin film on GaN.

Original languageEnglish
Pages (from-to)277-280
Number of pages4
JournalKorean Journal of Chemical Engineering
Issue number1
Publication statusPublished - 2009 Jan


  • Block copolymers
  • GaN
  • Light emitting diodes
  • Nanoporous Templates

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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