Low-Powered E-Switching Block Copolymer Structural Color Display with Organohydrogel Humidity Controller

Chang Eun Lee; Tae Hyun Park; Seungsoo Mun; Youngdoo Jung; Seokyeong Lee; Jihye Jang; Du Yeol Ryu; Cheolmin Park

doi:10.1002/admt.202200385

Low-Powered E-Switching Block Copolymer Structural Color Display with Organohydrogel Humidity Controller

Chang Eun Lee, Tae Hyun Park, Seungsoo Mun, Youngdoo Jung, Seokyeong Lee, Jihye Jang, Du Yeol Ryu, Cheolmin Park

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

3 Citations (Scopus)

Abstract

Soft-solid photonic crystals (PCs) based on periodically ordered block copolymer (BCP) nanostructures demonstrate stimuli-adaptive structural colors (SCs) and desirable mechanical properties suitable for reflective-mode electric-switching (E-switching) displays. However, the low electrochemical stability and humidity-dependent E-switching performance of hygroscopic ionic salts, often employed for E-field-adaptive structural alteration, limit their applications. In this study, a low-powered capacitive E-switching BCP SC display with an organohydrogel (OH) humidity controller is proposed, where a bilayer of a BCP and a polymer blend with hygroscopic E-field-adaptive ionic salts is sandwiched between Au electrodes. The display reliably exhibits reversible full-color E-switching (100 on/off cycles) at operating voltages of +2.5 to −2 V within the ionic salts’ electrochemical window at ≈50% humidity. A patchable and reusable OH serves as a water reservoir (with optimized geometries and dimensions) to improve the display's humidity tolerance, providing a target humidity (≈50%). The proposed display performs at ambient humidity lower than 60% for over 10 days because of the long water retention and mechanical integrity properties of OH. Additionally, the topologically micropatterned BCP PC allows lateral diffusion of ionic salts through the sides of the patterned domain under E-field, facilitating E-switching speeds of ≈30 s.

Original language	English
Article number	2200385
Journal	Advanced Materials Technologies
Volume	7
Issue number	8
DOIs	https://doi.org/10.1002/admt.202200385
Publication status	Published - 2022 Aug

Bibliographical note

Funding Information:
C.E.L. and T.H.P. contributed equally to this work. This research was supported by the National Research Foundation of Korea (NRF) as a Creative Materials Discovery Program funded by the Ministry of Science and ICT (Grant No. NRF‐2018M3D1A1058536) and the Korean government (MEST) (Grant No. 2020R1A2B5B03002697). This research was supported by the Technology Innovation Programme (20012430) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea). This research was also supported by KIST Institutional Program (project no. 2E31032‐21‐150), and the Korea Initiative for fostering the University of Research and Innovation (KIURI) Program of the National Research Foundation (NRF) funded by the Korean government (MSIT) (NRF‐ 2020M3H1A1077207).

Publisher Copyright:
© 2022 Wiley-VCH GmbH.

All Science Journal Classification (ASJC) codes

Materials Science(all)
Mechanics of Materials
Industrial and Manufacturing Engineering

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10.1002/admt.202200385

Cite this

@article{e2f6a7f66a33450b958494a3c26d8168,

title = "Low-Powered E-Switching Block Copolymer Structural Color Display with Organohydrogel Humidity Controller",

abstract = "Soft-solid photonic crystals (PCs) based on periodically ordered block copolymer (BCP) nanostructures demonstrate stimuli-adaptive structural colors (SCs) and desirable mechanical properties suitable for reflective-mode electric-switching (E-switching) displays. However, the low electrochemical stability and humidity-dependent E-switching performance of hygroscopic ionic salts, often employed for E-field-adaptive structural alteration, limit their applications. In this study, a low-powered capacitive E-switching BCP SC display with an organohydrogel (OH) humidity controller is proposed, where a bilayer of a BCP and a polymer blend with hygroscopic E-field-adaptive ionic salts is sandwiched between Au electrodes. The display reliably exhibits reversible full-color E-switching (100 on/off cycles) at operating voltages of +2.5 to −2 V within the ionic salts{\textquoteright} electrochemical window at ≈50% humidity. A patchable and reusable OH serves as a water reservoir (with optimized geometries and dimensions) to improve the display's humidity tolerance, providing a target humidity (≈50%). The proposed display performs at ambient humidity lower than 60% for over 10 days because of the long water retention and mechanical integrity properties of OH. Additionally, the topologically micropatterned BCP PC allows lateral diffusion of ionic salts through the sides of the patterned domain under E-field, facilitating E-switching speeds of ≈30 s.",

author = "Lee, {Chang Eun} and Park, {Tae Hyun} and Seungsoo Mun and Youngdoo Jung and Seokyeong Lee and Jihye Jang and Ryu, {Du Yeol} and Cheolmin Park",

note = "Funding Information: C.E.L. and T.H.P. contributed equally to this work. This research was supported by the National Research Foundation of Korea (NRF) as a Creative Materials Discovery Program funded by the Ministry of Science and ICT (Grant No. NRF‐2018M3D1A1058536) and the Korean government (MEST) (Grant No. 2020R1A2B5B03002697). This research was supported by the Technology Innovation Programme (20012430) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea). This research was also supported by KIST Institutional Program (project no. 2E31032‐21‐150), and the Korea Initiative for fostering the University of Research and Innovation (KIURI) Program of the National Research Foundation (NRF) funded by the Korean government (MSIT) (NRF‐ 2020M3H1A1077207). Publisher Copyright: {\textcopyright} 2022 Wiley-VCH GmbH.",

year = "2022",

month = aug,

doi = "10.1002/admt.202200385",

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AU - Lee, Chang Eun

AU - Park, Tae Hyun

AU - Mun, Seungsoo

AU - Jung, Youngdoo

AU - Lee, Seokyeong

AU - Jang, Jihye

AU - Ryu, Du Yeol

AU - Park, Cheolmin

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PY - 2022/8

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N2 - Soft-solid photonic crystals (PCs) based on periodically ordered block copolymer (BCP) nanostructures demonstrate stimuli-adaptive structural colors (SCs) and desirable mechanical properties suitable for reflective-mode electric-switching (E-switching) displays. However, the low electrochemical stability and humidity-dependent E-switching performance of hygroscopic ionic salts, often employed for E-field-adaptive structural alteration, limit their applications. In this study, a low-powered capacitive E-switching BCP SC display with an organohydrogel (OH) humidity controller is proposed, where a bilayer of a BCP and a polymer blend with hygroscopic E-field-adaptive ionic salts is sandwiched between Au electrodes. The display reliably exhibits reversible full-color E-switching (100 on/off cycles) at operating voltages of +2.5 to −2 V within the ionic salts’ electrochemical window at ≈50% humidity. A patchable and reusable OH serves as a water reservoir (with optimized geometries and dimensions) to improve the display's humidity tolerance, providing a target humidity (≈50%). The proposed display performs at ambient humidity lower than 60% for over 10 days because of the long water retention and mechanical integrity properties of OH. Additionally, the topologically micropatterned BCP PC allows lateral diffusion of ionic salts through the sides of the patterned domain under E-field, facilitating E-switching speeds of ≈30 s.

AB - Soft-solid photonic crystals (PCs) based on periodically ordered block copolymer (BCP) nanostructures demonstrate stimuli-adaptive structural colors (SCs) and desirable mechanical properties suitable for reflective-mode electric-switching (E-switching) displays. However, the low electrochemical stability and humidity-dependent E-switching performance of hygroscopic ionic salts, often employed for E-field-adaptive structural alteration, limit their applications. In this study, a low-powered capacitive E-switching BCP SC display with an organohydrogel (OH) humidity controller is proposed, where a bilayer of a BCP and a polymer blend with hygroscopic E-field-adaptive ionic salts is sandwiched between Au electrodes. The display reliably exhibits reversible full-color E-switching (100 on/off cycles) at operating voltages of +2.5 to −2 V within the ionic salts’ electrochemical window at ≈50% humidity. A patchable and reusable OH serves as a water reservoir (with optimized geometries and dimensions) to improve the display's humidity tolerance, providing a target humidity (≈50%). The proposed display performs at ambient humidity lower than 60% for over 10 days because of the long water retention and mechanical integrity properties of OH. Additionally, the topologically micropatterned BCP PC allows lateral diffusion of ionic salts through the sides of the patterned domain under E-field, facilitating E-switching speeds of ≈30 s.

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Low-Powered E-Switching Block Copolymer Structural Color Display with Organohydrogel Humidity Controller

Abstract

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