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

doi:10.1007/s11814-009-0047-4

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^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	277-280
Number of pages	4
Journal	Korean Journal of Chemical Engineering
Volume	26
Issue number	1
DOIs	https://doi.org/10.1007/s11814-009-0047-4
Publication status	Published - 2009 Jan

Bibliographical note

Funding Information:
This work was supported by the ERC Program of the KOSEF grant funded by the Korean government (MEST) (R11-2005-048-00000-0). YC, KL, KK, and KS thank the supports by the Korean government (2008-10002-0067-0), KRF (KRF-2006-331-D00160), KOSEF (R01-2006-000-10749-0), KIST (2E20900), and Samsung Electronics Co.

Keywords

Block copolymers
GaN
Light emitting diodes
Nanoporous Templates

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering

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10.1007/s11814-009-0047-4

Cite this

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title = "Enhanced light emission of nano-patterned GaN via block copolymer thin films",

abstract = "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.",

keywords = "Block copolymers, GaN, Light emitting diodes, Nanoporous Templates",

author = "Cho, \{Yo Han\} and Kyunghee Lee and Kyunghoon Kim and Baik, \{Kwang Hyun\} and Jinhan Cho and Jihyun Kim and Kyusoon Shin and Joona Bang",

note = "Funding Information: This work was supported by the ERC Program of the KOSEF grant funded by the Korean government (MEST) (R11-2005-048-00000-0). YC, KL, KK, and KS thank the supports by the Korean government (2008-10002-0067-0), KRF (KRF-2006-331-D00160), KOSEF (R01-2006-000-10749-0), KIST (2E20900), and Samsung Electronics Co.",

year = "2009",

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doi = "10.1007/s11814-009-0047-4",

language = "English",

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AU - Cho, Yo Han

AU - Lee, Kyunghee

AU - Kim, Kyunghoon

AU - Baik, Kwang Hyun

AU - Cho, Jinhan

AU - Kim, Jihyun

AU - Shin, Kyusoon

AU - Bang, Joona

N1 - Funding Information: This work was supported by the ERC Program of the KOSEF grant funded by the Korean government (MEST) (R11-2005-048-00000-0). YC, KL, KK, and KS thank the supports by the Korean government (2008-10002-0067-0), KRF (KRF-2006-331-D00160), KOSEF (R01-2006-000-10749-0), KIST (2E20900), and Samsung Electronics Co.

PY - 2009/1

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N2 - 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.

AB - 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.

KW - Block copolymers

KW - GaN

KW - Light emitting diodes

KW - Nanoporous Templates

UR - https://www.scopus.com/pages/publications/59349095522

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DO - 10.1007/s11814-009-0047-4

M3 - Article

AN - SCOPUS:59349095522

SN - 0256-1115

VL - 26

SP - 277

EP - 280

JO - Korean Journal of Chemical Engineering

JF - Korean Journal of Chemical Engineering

IS - 1

ER -

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

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

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