Enhanced light extraction efficiency of GaN-based light-emitting diodes with ZnO nanorod arrays grown using aqueous solution

Kyoung Kook Kim; Sam Dong Lee; Hyunsoo Kim; Jae Chul Park; Sung Nam Lee; Youngsoo Park; Seong Ju Park; Sang Woo Kim

doi:10.1063/1.3077606

Enhanced light extraction efficiency of GaN-based light-emitting diodes with ZnO nanorod arrays grown using aqueous solution

Kyoung Kook Kim, Sam Dong Lee, Hyunsoo Kim, Jae Chul Park, Sung Nam Lee, Youngsoo Park, Seong Ju Park, Sang Woo Kim

Department of Materials Science and Engineering

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

Abstract

We report a dramatic increase in the light extraction efficiency of GaN-based blue light-emitting diodes (LEDs) by ZnO nanorod arrays on a planar indium tin oxide (ITO) transparent electrode. ZnO nanorods were grown into aqueous solution at the low temperature of 90 °C. With 20 mA current injection, the light output efficiency of the LED with ZnO nanorod arrays on ITO was increased by about 57% with no increase in a forward voltage over the conventional LEDs with planar ITO. The increased light extraction by the ZnO nanorod arrays is due to the formation of sidewalls and a rough surface, resulting in a multiple photon scattering at the LED surface.

Original language	English
Article number	071118
Journal	Applied Physics Letters
Volume	94
Issue number	7
DOIs	https://doi.org/10.1063/1.3077606
Publication status	Published - 2009

Bibliographical note

Funding Information:
This work was supported by the Korea Research Foundation grant funded by the Korean Government (MOEHRD, Basic Research Promotion Fund) (Grant No. KRF-2007–313-D00475) and by Samsung Advanced Institute of Technology.

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.3077606

Cite this

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title = "Enhanced light extraction efficiency of GaN-based light-emitting diodes with ZnO nanorod arrays grown using aqueous solution",

abstract = "We report a dramatic increase in the light extraction efficiency of GaN-based blue light-emitting diodes (LEDs) by ZnO nanorod arrays on a planar indium tin oxide (ITO) transparent electrode. ZnO nanorods were grown into aqueous solution at the low temperature of 90 °C. With 20 mA current injection, the light output efficiency of the LED with ZnO nanorod arrays on ITO was increased by about 57% with no increase in a forward voltage over the conventional LEDs with planar ITO. The increased light extraction by the ZnO nanorod arrays is due to the formation of sidewalls and a rough surface, resulting in a multiple photon scattering at the LED surface.",

author = "Kim, {Kyoung Kook} and Lee, {Sam Dong} and Hyunsoo Kim and Park, {Jae Chul} and Lee, {Sung Nam} and Youngsoo Park and Park, {Seong Ju} and Kim, {Sang Woo}",

note = "Funding Information: This work was supported by the Korea Research Foundation grant funded by the Korean Government (MOEHRD, Basic Research Promotion Fund) (Grant No. KRF-2007–313-D00475) and by Samsung Advanced Institute of Technology. ",

year = "2009",

doi = "10.1063/1.3077606",

language = "English",

volume = "94",

journal = "Applied Physics Letters",

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AU - Kim, Kyoung Kook

AU - Lee, Sam Dong

AU - Kim, Hyunsoo

AU - Park, Jae Chul

AU - Lee, Sung Nam

AU - Park, Youngsoo

AU - Park, Seong Ju

AU - Kim, Sang Woo

N1 - Funding Information: This work was supported by the Korea Research Foundation grant funded by the Korean Government (MOEHRD, Basic Research Promotion Fund) (Grant No. KRF-2007–313-D00475) and by Samsung Advanced Institute of Technology.

PY - 2009

Y1 - 2009

N2 - We report a dramatic increase in the light extraction efficiency of GaN-based blue light-emitting diodes (LEDs) by ZnO nanorod arrays on a planar indium tin oxide (ITO) transparent electrode. ZnO nanorods were grown into aqueous solution at the low temperature of 90 °C. With 20 mA current injection, the light output efficiency of the LED with ZnO nanorod arrays on ITO was increased by about 57% with no increase in a forward voltage over the conventional LEDs with planar ITO. The increased light extraction by the ZnO nanorod arrays is due to the formation of sidewalls and a rough surface, resulting in a multiple photon scattering at the LED surface.

AB - We report a dramatic increase in the light extraction efficiency of GaN-based blue light-emitting diodes (LEDs) by ZnO nanorod arrays on a planar indium tin oxide (ITO) transparent electrode. ZnO nanorods were grown into aqueous solution at the low temperature of 90 °C. With 20 mA current injection, the light output efficiency of the LED with ZnO nanorod arrays on ITO was increased by about 57% with no increase in a forward voltage over the conventional LEDs with planar ITO. The increased light extraction by the ZnO nanorod arrays is due to the formation of sidewalls and a rough surface, resulting in a multiple photon scattering at the LED surface.

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Enhanced light extraction efficiency of GaN-based light-emitting diodes with ZnO nanorod arrays grown using aqueous solution

Abstract

Bibliographical note

All Science Journal Classification (ASJC) codes

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