Enhancement of light extraction efficiency of ultraviolet light emitting diodes by patterning of SiO2 nanosphere arrays

B. J. Kim; H. Jung; J. Shin; M. A. Mastro; C. R. Eddy; J. K. Hite; S. H. Kim; J. Bang; J. Kim

doi:10.1016/j.tsf.2008.11.067

Enhancement of light extraction efficiency of ultraviolet light emitting diodes by patterning of SiO₂ nanosphere arrays

B. J. Kim, H. Jung, J. Shin, M. A. Mastro, C. R. Eddy, J. K. Hite, S. H. Kim, J. Bang, J. Kim

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

29 Citations (Scopus)

Abstract

Here we introduce a simple and robust method to improve the light extraction efficiency of ultraviolet light emitting diodes (UV LEDs). Although many previous efforts have focused on etching the GaN surfaces, we employed a simple solution process to texture the GaN surface. Arrays of SiO₂ nanosphere monolayers were spun cast onto a polymer layer, consisting of benzocyclobutene (BCB) resins; subsequently, the bottom half of the SiO₂ nanospheres sunk into the BCB layer. The resulting array formed in a hexagonal-like pattern of 'nano-lenses' and the photoluminescence measurement exhibited that these patterns enhanced the light extracting efficiency of UV LEDs by 23%.

Original language	English
Pages (from-to)	2742-2744
Number of pages	3
Journal	Thin Solid Films
Volume	517
Issue number	8
DOIs	https://doi.org/10.1016/j.tsf.2008.11.067
Publication status	Published - 2009 Feb 27

Bibliographical note

Funding Information:
The research at Korea University was supported by the Carbon Dioxide Reduction and Sequestration Center, one of the 21st Century Frontier R&D Program funded by the Ministry of Education, Science and Technology of Korea. The research at NRL was supported by ONR.

Keywords

Light emitting diode
Light extraction efficiency
Nanosphere arrays

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Surfaces and Interfaces
Surfaces, Coatings and Films
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.tsf.2008.11.067

Cite this

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title = "Enhancement of light extraction efficiency of ultraviolet light emitting diodes by patterning of SiO2 nanosphere arrays",

abstract = "Here we introduce a simple and robust method to improve the light extraction efficiency of ultraviolet light emitting diodes (UV LEDs). Although many previous efforts have focused on etching the GaN surfaces, we employed a simple solution process to texture the GaN surface. Arrays of SiO2 nanosphere monolayers were spun cast onto a polymer layer, consisting of benzocyclobutene (BCB) resins; subsequently, the bottom half of the SiO2 nanospheres sunk into the BCB layer. The resulting array formed in a hexagonal-like pattern of 'nano-lenses' and the photoluminescence measurement exhibited that these patterns enhanced the light extracting efficiency of UV LEDs by 23%.",

keywords = "Light emitting diode, Light extraction efficiency, Nanosphere arrays",

author = "Kim, {B. J.} and H. Jung and J. Shin and Mastro, {M. A.} and Eddy, {C. R.} and Hite, {J. K.} and Kim, {S. H.} and J. Bang and J. Kim",

note = "Funding Information: The research at Korea University was supported by the Carbon Dioxide Reduction and Sequestration Center, one of the 21st Century Frontier R&D Program funded by the Ministry of Education, Science and Technology of Korea. The research at NRL was supported by ONR.",

year = "2009",

month = feb,

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doi = "10.1016/j.tsf.2008.11.067",

language = "English",

volume = "517",

pages = "2742--2744",

journal = "Thin Solid Films",

issn = "0040-6090",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Enhancement of light extraction efficiency of ultraviolet light emitting diodes by patterning of SiO2 nanosphere arrays

AU - Kim, B. J.

AU - Jung, H.

AU - Shin, J.

AU - Mastro, M. A.

AU - Eddy, C. R.

AU - Hite, J. K.

AU - Kim, S. H.

AU - Bang, J.

AU - Kim, J.

N1 - Funding Information: The research at Korea University was supported by the Carbon Dioxide Reduction and Sequestration Center, one of the 21st Century Frontier R&D Program funded by the Ministry of Education, Science and Technology of Korea. The research at NRL was supported by ONR.

PY - 2009/2/27

Y1 - 2009/2/27

N2 - Here we introduce a simple and robust method to improve the light extraction efficiency of ultraviolet light emitting diodes (UV LEDs). Although many previous efforts have focused on etching the GaN surfaces, we employed a simple solution process to texture the GaN surface. Arrays of SiO2 nanosphere monolayers were spun cast onto a polymer layer, consisting of benzocyclobutene (BCB) resins; subsequently, the bottom half of the SiO2 nanospheres sunk into the BCB layer. The resulting array formed in a hexagonal-like pattern of 'nano-lenses' and the photoluminescence measurement exhibited that these patterns enhanced the light extracting efficiency of UV LEDs by 23%.

AB - Here we introduce a simple and robust method to improve the light extraction efficiency of ultraviolet light emitting diodes (UV LEDs). Although many previous efforts have focused on etching the GaN surfaces, we employed a simple solution process to texture the GaN surface. Arrays of SiO2 nanosphere monolayers were spun cast onto a polymer layer, consisting of benzocyclobutene (BCB) resins; subsequently, the bottom half of the SiO2 nanospheres sunk into the BCB layer. The resulting array formed in a hexagonal-like pattern of 'nano-lenses' and the photoluminescence measurement exhibited that these patterns enhanced the light extracting efficiency of UV LEDs by 23%.

KW - Light emitting diode

KW - Light extraction efficiency

KW - Nanosphere arrays

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U2 - 10.1016/j.tsf.2008.11.067

DO - 10.1016/j.tsf.2008.11.067

M3 - Letter

AN - SCOPUS:59149094146

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JO - Thin Solid Films

JF - Thin Solid Films

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