Highly improved light extraction with a reduced spectrum distortion of organic light-emitting diodes composed by the sub-visible wavelength nano-scale periodic (∼250 nm) structure and micro-lens array

Kyung Bok Choi; Se Joong Shin; Tae Hyun Park; Hyun Jun Lee; Ju Hyun Hwang; Jung Ho Park; Bo Yeon Hwang; Young Wook Park; Byeong Kwon Ju

doi:10.1016/j.orgel.2013.10.021

Highly improved light extraction with a reduced spectrum distortion of organic light-emitting diodes composed by the sub-visible wavelength nano-scale periodic (∼250 nm) structure and micro-lens array

Kyung Bok Choi, Se Joong Shin, Tae Hyun Park, Hyun Jun Lee, Ju Hyun Hwang, Jung Ho Park, Bo Yeon Hwang, Young Wook Park, Byeong Kwon Ju

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

27 Citations (Scopus)

Abstract

Out-coupling enhanced organic light-emitting diodes (OLEDs) with micro-lens arrays and a nano-scale periodic light-extraction structure - a photonic crystal (PC) - utilizing laser interference lithography (LIL) are demonstrated. Generally, PC-based OLEDs suffer from a distorted and shifted spectrum, despite a highly improved intensity. However, in this study, we demonstrate PC-based OLEDs with a distortion-free spectrum and a highly improved out-coupling performance. It was found that spectrum distortion decreased with the pitch size of the PC. The PC-based OLED with a 250 nm pitch size showed a dramatically reduced spectral shift: International Commission on Illumination 1931 color coordinate of (Δ0.00, Δ0.00) and Δpeak wavelength of 0 nm as compared with the reference. Simultaneously, the external quantum efficiency and the power efficiency were enhanced by up to 178% and 264%, respectively, as compared with the reference. Moreover, through the LIL, simple and maskless processes were achieved for a light-extraction structure over a large area.

Original language	English
Pages (from-to)	111-117
Number of pages	7
Journal	Organic Electronics
Volume	15
Issue number	1
DOIs	https://doi.org/10.1016/j.orgel.2013.10.021
Publication status	Published - 2014

Bibliographical note

Funding Information:
K.B Choi and S.J Shin contributed equally to this work. This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by Korea government (MSIP) (CAFDC/Byeong-Kwon Ju/No. 2007-0056090), the NRF Project of the MEST (No. 2012R1A6A3A04039396), and the IT R&D Program of MKE/KEIT (No. 2009-F-016-01, Development of Eco-Emotional OLED Flat-Panel Lighting). The authors thank the staff of KBSI for technical assistance.

Keywords

Laser interference lithography (LIL)
Micro-lens arrays
Nano-scale periodic pattern
Organic light-emitting diodes (OLEDs)
Out-coupling
Photonic crystal

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Biomaterials
General Chemistry
Condensed Matter Physics
Materials Chemistry
Electrical and Electronic Engineering

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10.1016/j.orgel.2013.10.021

Cite this

Choi, K. B., Shin, S. J., Park, T. H., Lee, H. J., Hwang, J. H., Park, J. H., Hwang, B. Y., Park, Y. W., & Ju, B. K. (2014). Highly improved light extraction with a reduced spectrum distortion of organic light-emitting diodes composed by the sub-visible wavelength nano-scale periodic (∼250 nm) structure and micro-lens array. Organic Electronics, 15(1), 111-117. https://doi.org/10.1016/j.orgel.2013.10.021

Highly improved light extraction with a reduced spectrum distortion of organic light-emitting diodes composed by the sub-visible wavelength nano-scale periodic (∼250 nm) structure and micro-lens array. / Choi, Kyung Bok; Shin, Se Joong; Park, Tae Hyun et al.
In: Organic Electronics, Vol. 15, No. 1, 2014, p. 111-117.

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

Choi, KB, Shin, SJ, Park, TH, Lee, HJ, Hwang, JH, Park, JH, Hwang, BY, Park, YW & Ju, BK 2014, 'Highly improved light extraction with a reduced spectrum distortion of organic light-emitting diodes composed by the sub-visible wavelength nano-scale periodic (∼250 nm) structure and micro-lens array', Organic Electronics, vol. 15, no. 1, pp. 111-117. https://doi.org/10.1016/j.orgel.2013.10.021

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title = "Highly improved light extraction with a reduced spectrum distortion of organic light-emitting diodes composed by the sub-visible wavelength nano-scale periodic (∼250 nm) structure and micro-lens array",

abstract = "Out-coupling enhanced organic light-emitting diodes (OLEDs) with micro-lens arrays and a nano-scale periodic light-extraction structure - a photonic crystal (PC) - utilizing laser interference lithography (LIL) are demonstrated. Generally, PC-based OLEDs suffer from a distorted and shifted spectrum, despite a highly improved intensity. However, in this study, we demonstrate PC-based OLEDs with a distortion-free spectrum and a highly improved out-coupling performance. It was found that spectrum distortion decreased with the pitch size of the PC. The PC-based OLED with a 250 nm pitch size showed a dramatically reduced spectral shift: International Commission on Illumination 1931 color coordinate of (Δ0.00, Δ0.00) and Δpeak wavelength of 0 nm as compared with the reference. Simultaneously, the external quantum efficiency and the power efficiency were enhanced by up to 178% and 264%, respectively, as compared with the reference. Moreover, through the LIL, simple and maskless processes were achieved for a light-extraction structure over a large area.",

keywords = "Laser interference lithography (LIL), Micro-lens arrays, Nano-scale periodic pattern, Organic light-emitting diodes (OLEDs), Out-coupling, Photonic crystal",

author = "Choi, {Kyung Bok} and Shin, {Se Joong} and Park, {Tae Hyun} and Lee, {Hyun Jun} and Hwang, {Ju Hyun} and Park, {Jung Ho} and Hwang, {Bo Yeon} and Park, {Young Wook} and Ju, {Byeong Kwon}",

note = "Funding Information: K.B Choi and S.J Shin contributed equally to this work. This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by Korea government (MSIP) (CAFDC/Byeong-Kwon Ju/No. 2007-0056090), the NRF Project of the MEST (No. 2012R1A6A3A04039396), and the IT R&D Program of MKE/KEIT (No. 2009-F-016-01, Development of Eco-Emotional OLED Flat-Panel Lighting). The authors thank the staff of KBSI for technical assistance. ",

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T1 - Highly improved light extraction with a reduced spectrum distortion of organic light-emitting diodes composed by the sub-visible wavelength nano-scale periodic (∼250 nm) structure and micro-lens array

AU - Choi, Kyung Bok

AU - Shin, Se Joong

AU - Park, Tae Hyun

AU - Lee, Hyun Jun

AU - Hwang, Ju Hyun

AU - Park, Jung Ho

AU - Hwang, Bo Yeon

AU - Park, Young Wook

AU - Ju, Byeong Kwon

N1 - Funding Information: K.B Choi and S.J Shin contributed equally to this work. This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by Korea government (MSIP) (CAFDC/Byeong-Kwon Ju/No. 2007-0056090), the NRF Project of the MEST (No. 2012R1A6A3A04039396), and the IT R&D Program of MKE/KEIT (No. 2009-F-016-01, Development of Eco-Emotional OLED Flat-Panel Lighting). The authors thank the staff of KBSI for technical assistance.

PY - 2014

Y1 - 2014

N2 - Out-coupling enhanced organic light-emitting diodes (OLEDs) with micro-lens arrays and a nano-scale periodic light-extraction structure - a photonic crystal (PC) - utilizing laser interference lithography (LIL) are demonstrated. Generally, PC-based OLEDs suffer from a distorted and shifted spectrum, despite a highly improved intensity. However, in this study, we demonstrate PC-based OLEDs with a distortion-free spectrum and a highly improved out-coupling performance. It was found that spectrum distortion decreased with the pitch size of the PC. The PC-based OLED with a 250 nm pitch size showed a dramatically reduced spectral shift: International Commission on Illumination 1931 color coordinate of (Δ0.00, Δ0.00) and Δpeak wavelength of 0 nm as compared with the reference. Simultaneously, the external quantum efficiency and the power efficiency were enhanced by up to 178% and 264%, respectively, as compared with the reference. Moreover, through the LIL, simple and maskless processes were achieved for a light-extraction structure over a large area.

AB - Out-coupling enhanced organic light-emitting diodes (OLEDs) with micro-lens arrays and a nano-scale periodic light-extraction structure - a photonic crystal (PC) - utilizing laser interference lithography (LIL) are demonstrated. Generally, PC-based OLEDs suffer from a distorted and shifted spectrum, despite a highly improved intensity. However, in this study, we demonstrate PC-based OLEDs with a distortion-free spectrum and a highly improved out-coupling performance. It was found that spectrum distortion decreased with the pitch size of the PC. The PC-based OLED with a 250 nm pitch size showed a dramatically reduced spectral shift: International Commission on Illumination 1931 color coordinate of (Δ0.00, Δ0.00) and Δpeak wavelength of 0 nm as compared with the reference. Simultaneously, the external quantum efficiency and the power efficiency were enhanced by up to 178% and 264%, respectively, as compared with the reference. Moreover, through the LIL, simple and maskless processes were achieved for a light-extraction structure over a large area.

KW - Laser interference lithography (LIL)

KW - Micro-lens arrays

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KW - Organic light-emitting diodes (OLEDs)

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JO - Organic Electronics

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Highly improved light extraction with a reduced spectrum distortion of organic light-emitting diodes composed by the sub-visible wavelength nano-scale periodic (∼250 nm) structure and micro-lens array

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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