Light Extraction Enhancement in Flexible Organic Light-Emitting Diodes by a Light-Scattering Layer of Dewetted Ag Nanoparticles at Low Temperatures

Junhee Choi; Seonju Kim; Cheol Hwee Park; Jin Ho Kwack; Chan Hyuk Park; Ha Hwang; Hyeong Seop Im; Young Wook Park; Byeong Kwon Ju

doi:10.1021/acsami.8b07026

Light Extraction Enhancement in Flexible Organic Light-Emitting Diodes by a Light-Scattering Layer of Dewetted Ag Nanoparticles at Low Temperatures

Junhee Choi, Seonju Kim, Cheol Hwee Park, Jin Ho Kwack, Chan Hyuk Park, Ha Hwang, Hyeong Seop Im, Young Wook Park, Byeong Kwon Ju

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

25 Citations (Scopus)

Abstract

We demonstrated light extraction improvement by applying a scattering layer of Ag nanoparticles physically synthesized through a low-temperature annealing process to flexible organic light-emitting diodes (OLEDs). In general, increasing the size of Ag nanoparticles is preferred to increase light scattering, but a high-temperature annealing process (∼400 °C) is required to produce them. However, flexible substrates generally cannot withstand high-temperature processes. In this study, we formed Ag nanoparticles at a low temperature of ∼200 °C by inserting a poly(3,4-ethylenedioxythiophene) polystyrene sulfonate buffer layer, thus promoting Ag dewetting. As a result, the scattering layer of enlarged Ag nanoparticles formed at low temperatures increased the external quantum efficiency by 24% in a flexible OLED compared to a reference device.

Original language	English
Pages (from-to)	32373-32379
Number of pages	7
Journal	ACS Applied Materials and Interfaces
Volume	10
Issue number	38
DOIs	https://doi.org/10.1021/acsami.8b07026
Publication status	Published - 2018 Sept 26
Externally published	Yes

Keywords

light extraction
light scattering
metal nanoparticles
organic light-emitting diodes (OLEDs)
plasmonics

ASJC Scopus subject areas

Materials Science(all)

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10.1021/acsami.8b07026

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title = "Light Extraction Enhancement in Flexible Organic Light-Emitting Diodes by a Light-Scattering Layer of Dewetted Ag Nanoparticles at Low Temperatures",

abstract = "We demonstrated light extraction improvement by applying a scattering layer of Ag nanoparticles physically synthesized through a low-temperature annealing process to flexible organic light-emitting diodes (OLEDs). In general, increasing the size of Ag nanoparticles is preferred to increase light scattering, but a high-temperature annealing process (∼400 °C) is required to produce them. However, flexible substrates generally cannot withstand high-temperature processes. In this study, we formed Ag nanoparticles at a low temperature of ∼200 °C by inserting a poly(3,4-ethylenedioxythiophene) polystyrene sulfonate buffer layer, thus promoting Ag dewetting. As a result, the scattering layer of enlarged Ag nanoparticles formed at low temperatures increased the external quantum efficiency by 24% in a flexible OLED compared to a reference device.",

keywords = "light extraction, light scattering, metal nanoparticles, organic light-emitting diodes (OLEDs), plasmonics",

author = "Junhee Choi and Seonju Kim and Park, {Cheol Hwee} and Kwack, {Jin Ho} and Park, {Chan Hyuk} and Ha Hwang and Im, {Hyeong Seop} and Park, {Young Wook} and Ju, {Byeong Kwon}",

note = "Funding Information: This research was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIP) (no. 2016R1A2B4014073) and the Ministry of Education (no. NRF-2017R1D1A1B03036520), and the Industry Technology R&D program (10048317, Development of red and blue OLEDs with EQE over 20% using delayed fluorescent materials) funded by MOTIE/KEIT. Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",

year = "2018",

month = sep,

day = "26",

doi = "10.1021/acsami.8b07026",

language = "English",

volume = "10",

pages = "32373--32379",

journal = "ACS applied materials & interfaces",

issn = "1944-8244",

publisher = "American Chemical Society",

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T1 - Light Extraction Enhancement in Flexible Organic Light-Emitting Diodes by a Light-Scattering Layer of Dewetted Ag Nanoparticles at Low Temperatures

AU - Choi, Junhee

AU - Kim, Seonju

AU - Park, Cheol Hwee

AU - Kwack, Jin Ho

AU - Park, Chan Hyuk

AU - Hwang, Ha

AU - Im, Hyeong Seop

AU - Park, Young Wook

AU - Ju, Byeong Kwon

N1 - Funding Information: This research was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIP) (no. 2016R1A2B4014073) and the Ministry of Education (no. NRF-2017R1D1A1B03036520), and the Industry Technology R&D program (10048317, Development of red and blue OLEDs with EQE over 20% using delayed fluorescent materials) funded by MOTIE/KEIT. Publisher Copyright: © 2018 American Chemical Society.

PY - 2018/9/26

Y1 - 2018/9/26

N2 - We demonstrated light extraction improvement by applying a scattering layer of Ag nanoparticles physically synthesized through a low-temperature annealing process to flexible organic light-emitting diodes (OLEDs). In general, increasing the size of Ag nanoparticles is preferred to increase light scattering, but a high-temperature annealing process (∼400 °C) is required to produce them. However, flexible substrates generally cannot withstand high-temperature processes. In this study, we formed Ag nanoparticles at a low temperature of ∼200 °C by inserting a poly(3,4-ethylenedioxythiophene) polystyrene sulfonate buffer layer, thus promoting Ag dewetting. As a result, the scattering layer of enlarged Ag nanoparticles formed at low temperatures increased the external quantum efficiency by 24% in a flexible OLED compared to a reference device.

AB - We demonstrated light extraction improvement by applying a scattering layer of Ag nanoparticles physically synthesized through a low-temperature annealing process to flexible organic light-emitting diodes (OLEDs). In general, increasing the size of Ag nanoparticles is preferred to increase light scattering, but a high-temperature annealing process (∼400 °C) is required to produce them. However, flexible substrates generally cannot withstand high-temperature processes. In this study, we formed Ag nanoparticles at a low temperature of ∼200 °C by inserting a poly(3,4-ethylenedioxythiophene) polystyrene sulfonate buffer layer, thus promoting Ag dewetting. As a result, the scattering layer of enlarged Ag nanoparticles formed at low temperatures increased the external quantum efficiency by 24% in a flexible OLED compared to a reference device.

KW - light extraction

KW - light scattering

KW - metal nanoparticles

KW - organic light-emitting diodes (OLEDs)

KW - plasmonics

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Light Extraction Enhancement in Flexible Organic Light-Emitting Diodes by a Light-Scattering Layer of Dewetted Ag Nanoparticles at Low Temperatures

Abstract

Keywords

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