Enhanced light extraction from organic light-emitting diodes using a quasi-periodic nano-structure

Ju Sung Lee; Yong Sub Shim; Chan Hyuk Park; Ha Hwang; Cheol Hwee Park; Chul Woong Joo; Young Wook Park; Jonghee Lee; Byeong Kwon Ju

doi:10.1088/1361-6528/aaf541

Enhanced light extraction from organic light-emitting diodes using a quasi-periodic nano-structure

Ju Sung Lee, Yong Sub Shim, Chan Hyuk Park, Ha Hwang, Cheol Hwee Park, Chul Woong Joo, Young Wook Park, Jonghee Lee, Byeong Kwon Ju

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

6 Citations (Scopus)

Abstract

Organic light-emitting diodes with a quasi-periodic nano-structure (QPS) were fabricated via a combination of laser interference lithography (LIL) and reactive ion etching (RIE). The LIL process was used to generate a periodic pattern, whereas the RIE process was used as a supplement to add randomness to the periodic pattern. The period of the fabricated periodic pattern was determined by finite difference time domain solutions. The height and density of the QPS were controlled by the RIE etching time and were optimized. The resulting quasi-periodic nanostructure comprised silicon dioxide (SiO ₂ ) with a low refractive index (n = 1.4-1.5), and an external quantum efficiency enhancement of 18% was achieved using the QPS device, without any viewing angle problems or spectral distortion, which are serious drawbacks of periodic patterns.

Original language	English
Article number	085302
Journal	Nanotechnology
Volume	30
Issue number	8
DOIs	https://doi.org/10.1088/1361-6528/aaf541
Publication status	Published - 2019 Feb 22

Bibliographical note

Funding Information:
This work was supported by the Industry Technology R&D program of MOTIE/KEIT (10048317, Development of red and blue OLEDs with external quantum efficiency over 20% using delayed fluorescent materials), the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIP) (No. 2016R1A2B4014073), the Basic Science Research program through the National Research Foundation of Korea (NRF) funded by the Ministry pf Edi-catopm (2018R1A6A1A03026005), and the KIAT (Korea Institute for Advancement of Technology) grant funded by the Korea Government (MOTIE: Ministry of Trade Industry and Energy). (No. P0001018, HRD program for Highly educated human resources development project on cutting-edge sensor technology for sensor industry acceleration).

Publisher Copyright:
© 2018 IOP Publishing Ltd.

Keywords

distortion free spectrum
light extraction
organic light-emitting diodes (OLEDs)
quasi-periodic nanostructures

ASJC Scopus subject areas

Bioengineering
General Chemistry
General Materials Science
Mechanics of Materials
Mechanical Engineering
Electrical and Electronic Engineering

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10.1088/1361-6528/aaf541

Cite this

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title = "Enhanced light extraction from organic light-emitting diodes using a quasi-periodic nano-structure",

abstract = " Organic light-emitting diodes with a quasi-periodic nano-structure (QPS) were fabricated via a combination of laser interference lithography (LIL) and reactive ion etching (RIE). The LIL process was used to generate a periodic pattern, whereas the RIE process was used as a supplement to add randomness to the periodic pattern. The period of the fabricated periodic pattern was determined by finite difference time domain solutions. The height and density of the QPS were controlled by the RIE etching time and were optimized. The resulting quasi-periodic nanostructure comprised silicon dioxide (SiO 2 ) with a low refractive index (n = 1.4-1.5), and an external quantum efficiency enhancement of 18% was achieved using the QPS device, without any viewing angle problems or spectral distortion, which are serious drawbacks of periodic patterns. ",

keywords = "distortion free spectrum, light extraction, organic light-emitting diodes (OLEDs), quasi-periodic nanostructures",

author = "Lee, {Ju Sung} and Shim, {Yong Sub} and Park, {Chan Hyuk} and Ha Hwang and Park, {Cheol Hwee} and Joo, {Chul Woong} and Park, {Young Wook} and Jonghee Lee and Ju, {Byeong Kwon}",

note = "Funding Information: This work was supported by the Industry Technology R&D program of MOTIE/KEIT (10048317, Development of red and blue OLEDs with external quantum efficiency over 20% using delayed fluorescent materials), the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIP) (No. 2016R1A2B4014073), the Basic Science Research program through the National Research Foundation of Korea (NRF) funded by the Ministry pf Edi-catopm (2018R1A6A1A03026005), and the KIAT (Korea Institute for Advancement of Technology) grant funded by the Korea Government (MOTIE: Ministry of Trade Industry and Energy). (No. P0001018, HRD program for Highly educated human resources development project on cutting-edge sensor technology for sensor industry acceleration). Publisher Copyright: {\textcopyright} 2018 IOP Publishing Ltd.",

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AU - Joo, Chul Woong

AU - Park, Young Wook

AU - Lee, Jonghee

AU - Ju, Byeong Kwon

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PY - 2019/2/22

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N2 - Organic light-emitting diodes with a quasi-periodic nano-structure (QPS) were fabricated via a combination of laser interference lithography (LIL) and reactive ion etching (RIE). The LIL process was used to generate a periodic pattern, whereas the RIE process was used as a supplement to add randomness to the periodic pattern. The period of the fabricated periodic pattern was determined by finite difference time domain solutions. The height and density of the QPS were controlled by the RIE etching time and were optimized. The resulting quasi-periodic nanostructure comprised silicon dioxide (SiO 2 ) with a low refractive index (n = 1.4-1.5), and an external quantum efficiency enhancement of 18% was achieved using the QPS device, without any viewing angle problems or spectral distortion, which are serious drawbacks of periodic patterns.

AB - Organic light-emitting diodes with a quasi-periodic nano-structure (QPS) were fabricated via a combination of laser interference lithography (LIL) and reactive ion etching (RIE). The LIL process was used to generate a periodic pattern, whereas the RIE process was used as a supplement to add randomness to the periodic pattern. The period of the fabricated periodic pattern was determined by finite difference time domain solutions. The height and density of the QPS were controlled by the RIE etching time and were optimized. The resulting quasi-periodic nanostructure comprised silicon dioxide (SiO 2 ) with a low refractive index (n = 1.4-1.5), and an external quantum efficiency enhancement of 18% was achieved using the QPS device, without any viewing angle problems or spectral distortion, which are serious drawbacks of periodic patterns.

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Enhanced light extraction from organic light-emitting diodes using a quasi-periodic nano-structure

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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