Enhancement of light extraction from organic light-emitting diodes with two-dimensional hexagonally nanoimprinted periodic structures using sequential surface relief grating

Soon Moon Jeong; Fumito Araoka; Yoshimi Machida; Yoichi Takanishi; Ken Ishikawa; Hideo Takezoe; Suzushi Nishimura; Goro Suzaki

doi:10.1143/JJAP.47.4566

Enhancement of light extraction from organic light-emitting diodes with two-dimensional hexagonally nanoimprinted periodic structures using sequential surface relief grating

Soon Moon Jeong, Fumito Araoka, Yoshimi Machida, Yoichi Takanishi, Ken Ishikawa, Hideo Takezoe, Suzushi Nishimura, Goro Suzaki

Division of Energy Techonology

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

39 Scopus citations

Abstract

Electric characteristics of organic light-emitting diodes (OLEDs) with two-dimensional hexagonally nanoimprinted periodic structures were investigated, and enhanced light extraction from this device was confirmed. A master mold was fabricated from an azobenzene polymer thin film patterned by sequential surface relief grating formation into a three-directional structure. The device shows a higher current density and a higher current efficiency, although leakage current is also higher than that of a device without periodic structures. These results are caused by the extraction of diffracted light from waveguided and substrate-guided light even when incident light has larger angles than the critical angle for total reflection.

Original language	English
Pages (from-to)	4566-4571
Number of pages	6
Journal	Japanese Journal of Applied Physics
Volume	47
Issue number	6 PART 1
DOIs	https://doi.org/10.1143/JJAP.47.4566
State	Published - 13 Jun 2008

Keywords

Bragg diffraction
Light extraction
Nano-imprinting
Organic light-emitting diodes

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10.1143/JJAP.47.4566

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Jeong, S. M., Araoka, F., Machida, Y., Takanishi, Y., Ishikawa, K., Takezoe, H., Nishimura, S., & Suzaki, G. (2008). Enhancement of light extraction from organic light-emitting diodes with two-dimensional hexagonally nanoimprinted periodic structures using sequential surface relief grating. Japanese Journal of Applied Physics, 47(6 PART 1), 4566-4571. https://doi.org/10.1143/JJAP.47.4566

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title = "Enhancement of light extraction from organic light-emitting diodes with two-dimensional hexagonally nanoimprinted periodic structures using sequential surface relief grating",

abstract = "Electric characteristics of organic light-emitting diodes (OLEDs) with two-dimensional hexagonally nanoimprinted periodic structures were investigated, and enhanced light extraction from this device was confirmed. A master mold was fabricated from an azobenzene polymer thin film patterned by sequential surface relief grating formation into a three-directional structure. The device shows a higher current density and a higher current efficiency, although leakage current is also higher than that of a device without periodic structures. These results are caused by the extraction of diffracted light from waveguided and substrate-guided light even when incident light has larger angles than the critical angle for total reflection.",

keywords = "Bragg diffraction, Light extraction, Nano-imprinting, Organic light-emitting diodes",

author = "Jeong, {Soon Moon} and Fumito Araoka and Yoshimi Machida and Yoichi Takanishi and Ken Ishikawa and Hideo Takezoe and Suzushi Nishimura and Goro Suzaki",

year = "2008",

month = jun,

day = "13",

doi = "10.1143/JJAP.47.4566",

language = "English",

volume = "47",

pages = "4566--4571",

journal = "Japanese Journal of Applied Physics",

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}

Jeong, SM, Araoka, F, Machida, Y, Takanishi, Y, Ishikawa, K, Takezoe, H, Nishimura, S & Suzaki, G 2008, 'Enhancement of light extraction from organic light-emitting diodes with two-dimensional hexagonally nanoimprinted periodic structures using sequential surface relief grating', Japanese Journal of Applied Physics, vol. 47, no. 6 PART 1, pp. 4566-4571. https://doi.org/10.1143/JJAP.47.4566

Enhancement of light extraction from organic light-emitting diodes with two-dimensional hexagonally nanoimprinted periodic structures using sequential surface relief grating. / Jeong, Soon Moon; Araoka, Fumito; Machida, Yoshimi et al.
In: Japanese Journal of Applied Physics, Vol. 47, No. 6 PART 1, 13.06.2008, p. 4566-4571.

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

TY - JOUR

T1 - Enhancement of light extraction from organic light-emitting diodes with two-dimensional hexagonally nanoimprinted periodic structures using sequential surface relief grating

AU - Jeong, Soon Moon

AU - Araoka, Fumito

AU - Machida, Yoshimi

AU - Takanishi, Yoichi

AU - Ishikawa, Ken

AU - Takezoe, Hideo

AU - Nishimura, Suzushi

AU - Suzaki, Goro

PY - 2008/6/13

Y1 - 2008/6/13

N2 - Electric characteristics of organic light-emitting diodes (OLEDs) with two-dimensional hexagonally nanoimprinted periodic structures were investigated, and enhanced light extraction from this device was confirmed. A master mold was fabricated from an azobenzene polymer thin film patterned by sequential surface relief grating formation into a three-directional structure. The device shows a higher current density and a higher current efficiency, although leakage current is also higher than that of a device without periodic structures. These results are caused by the extraction of diffracted light from waveguided and substrate-guided light even when incident light has larger angles than the critical angle for total reflection.

AB - Electric characteristics of organic light-emitting diodes (OLEDs) with two-dimensional hexagonally nanoimprinted periodic structures were investigated, and enhanced light extraction from this device was confirmed. A master mold was fabricated from an azobenzene polymer thin film patterned by sequential surface relief grating formation into a three-directional structure. The device shows a higher current density and a higher current efficiency, although leakage current is also higher than that of a device without periodic structures. These results are caused by the extraction of diffracted light from waveguided and substrate-guided light even when incident light has larger angles than the critical angle for total reflection.

KW - Bragg diffraction

KW - Light extraction

KW - Nano-imprinting

KW - Organic light-emitting diodes

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JO - Japanese Journal of Applied Physics

JF - Japanese Journal of Applied Physics

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ER -

Enhancement of light extraction from organic light-emitting diodes with two-dimensional hexagonally nanoimprinted periodic structures using sequential surface relief grating

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