New switchable mirror device with a counter electrode based on reversible electrodeposition

Cho, Seong M.; Kim, Su-Jung; Kim, Tae-Youb; Ah, Chil Seong; Song, Juhee; Cheon, Sang-Hoon; Kim, Joo Yeon; Ryu, Hojun; Kim, Min Su; Hwang, Chi‐Sun; Lee, Jeong Ik

doi:10.1016/j.solmat.2017.11.007

Cited by 31 publications

(33 citation statements)

References 46 publications

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“…And hence, ion storage layers were also used as counter electrodes besides the traditional ITO electrodes. [ 19,39,40,42,43 ] Another RME reaction at counter electrode is also reported. [ 8,25,26,34,53,54 ]…”

Section: Working Principles and Structure Of Rmedsmentioning

confidence: 99%

“…While the working electrode was subjected to a positive bias potential, the predeposited Ag layer began to dissolve and Li + ions were inserted into the WO 3 layer on the counter electrode, resulting in a bluish transparent state. [ 40 ] Because there is no Cu 2+ in the electrolyte, WO 3 and Ag + are the only oxidative species in the system that are able to go through a reduction reaction. The reduction potential of WO 3 is more positive than that of Ag + .…”

Section: Novel Designs For Faster Larger More Durable and Colorful Devicesmentioning

confidence: 99%

“…Excellent bistability was obtained in RMEDs based on Bi–Cu deposition, [ 25,26,28,34,39 ] and attempts have been made to improve the open‐circuit stability of Ag‐based RMEDs to avoid unnecessary power consumption. [ 40–43 ] The idea of using RMEDs to modulate IR radiation was originally proposed in 2008. [ 44 ] However, there has been no subsequent research reported thereafter.…”

Section: Introductionmentioning

confidence: 99%

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Reversible Metal Electrodeposition Devices: An Emerging Approach to Effective Light Modulation and Thermal Management

Tao

Liu

et al. 2021

Advanced Optical Materials

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light-emitting devices. Chromogenic materials and devices are widely used in smart windows and paper-like displays, particularly electrochromic materials, which can be actively and reliably controlled because they only respond to electrical stimuli. [11][12][13][14][15] Reversible metal electrodeposition device (RMED) is a novel type of electrochromic devices that can switch from transparent to opaque state by the electrodeposition of a metal layer onto the transparent electrode, and switch back to transparent state by the dissolution of the metal layer. The appearance and disappearance of the metal layer cause the color change of RMEDs. They take advantage of the unique optical properties of thin metal films with different thicknesses and morphologies to allow for excellent light modulation, thermal management, and display effects. The switchability of electrochromic devices between not only transparent and tinted states (including black, red, yellow, blue, etc.) but also the mirror state is advantageous, because this allows them to choose the optimal working mode as desired, and thus to function more effectively for multiple tasks. Owing to its high extinction coefficient, a thin metal film with a thickness of a few tens of nanometers would be completely opaque and highly reflective like bulk metals. [16] Research has also shown that the reflectance of RMEDs in the visible and infrared (IR) regions can reach ≈100% [17] and 90%, [18] respectively. Because RMEDs utilize the reversible deposition of metals to change their color, without a fixed electrochromic layer, their structure would be much simpler than that of typical electrochromic devices. The wide reflectance modulation range and simple device structure of RMEDs render them distinct from other electrochromic devices. The best performance reported for RMEDs are listed in Table 1.In the last century and the first decade of the 21th century, sustained efforts have been invested to apply the reversible electrodeposition mechanism to display devices. [19][20][21][22][23][24] In recent years, research on RMEDs has been progressing owing to their potential applications in energy-saving fields, especially in light modulation [8,[25][26][27][28] and thermal management. [18,29,30] Ag, Bi, and Cu are the most widely studied metals for reversible electrodeposition because of their high reversibility and the use of hazard-free electrolytes. The reversible electrodeposition of Au, [31] Zn, [32] Pb [8] and other metals is rarely reported due to their poor reversibility or the need for hazardous electrolytes.The reversible metal electrodeposition device (RMED) is a novel electrochromic application that utilizes the appearance and disappearance of a metal layer to achieve spectrum control. A thin metal film with a thickness of a few tens of nanometers would be highly reflective in the visible and infrared region, making it an ideal material to achieve light and heat modulation. Because of their outstanding spectrum control ability, RMEDs can be applied to displays, smart ...

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Section: Working Principles and Structure Of Rmedsmentioning

confidence: 99%

Section: Novel Designs For Faster Larger More Durable and Colorful Devicesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reversible Metal Electrodeposition Devices: An Emerging Approach to Effective Light Modulation and Thermal Management

Tao

Liu

et al. 2021

Advanced Optical Materials

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“…RED system realizes transparent and reflective mode as selectively formed and removed the reflector. [ 27–36 ] Although RED has potential to be used as the display applications, there are insufficient attempts on show colors.…”

Section: Introductionmentioning

confidence: 99%

Reflective‐Type Transparent/Colored Mirror Switchable Device Using Reversible Electrodeposition with Fabry–Perot Interferometer

Sung

Han

Song

et al. 2020

Adv Materials Technologies

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light condition. Furthermore, low transmittance is another issue to be enhanced. To retain the stability of outdoor visibility, the intensity of illumination is necessarily increased, which lead to eye fatigue and increase power consumption. To ensure the properties of outdoor visibility and high energy efficiency, reflective-type display can be a solution technique. In particular, electrochromic devices based upon the reversible electrodeposition (RED) technology is suitable for transparent display. RED system realizes transparent and reflective mode as selectively formed and removed the reflector. [27-36] Although RED has potential to be used as the display applications, there are insufficient attempts on show colors. In typical display, pigment/dye-based and structural-based color filters have been studied to absorb or emit specific wavelengths. Despite pigment/dye-based color filter has wide viewing angle and high color ratio, it has low chemical stability and imperfect color impurity. [37-39] Whereas, structuralbased color filter such as plasmon resonance [40-43] and Fabry-Perot (FP) interferometer [44-51] on the basis of the interaction between nanostructure and incident light provides the merits of spectral selectivity, chemical and thermal stability. These advantages led to obtain multicolor in single RED device by controlling the silver structure for plasmonic resonance. [52-56] However, fine control the metal structure for multicolor is essential, which can affect limitation to reproducibility and stability. On the other hand, there is no case for multicolored RED device with FP interferometer. FP-type color filter generates only the selected light by using the thin-film interference effect of multiple reflected waves from reflector. Therefore, various colors can be tuned by variety of materials and controlled cavity with simple process. In terms of robustness to variation cavity, material that have low refractive index is proper to form the thin films. [46] Moreover, low absorption characteristic in visible range is required to reduce the optical loss. Compared to others, indium-tin-oxide (ITO) has relatively low refractive index and low absorption spectra in visible range. In this paper, we first proposed a new structure for a transparent/colored mirror switchable RED device by integrating the micropixelated ITO (red, green, and blue: RGB) cavities for the FP interferometer. A variable thickness of ITO films and partially reflective Tungsten (W) film were used as Reversible electrodeposition (RED) devices have been considered as the optical transmittance or reflectance switchable display for the reflective display applications. In this study, transparent/colored mirror switchable RED device is demonstrated by integrating the Fabry-Perot (FP) interferometer. Indium-tin-oxide (ITO)-based FP interference effect is utilized for color filter to emit particular wavelength. Color-switchable RED cells are researched using ITO (red, green, and blue (RGB)) films and tungsten (W) films as partially reflective la...

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“…fabricated a device with mirror and erased (blue) states using a WO 3 electrochromic layer. [ 9 ] Their device achieved a maximum Δ T of 80% at its wavelength of 600 nm. However, these studies only demonstrated two states, i.e., transparent/mirror and mirror/erased.…”

Section: Introductionmentioning

confidence: 99%

Facile Fabrication of Trimodal Switchable Mirror Device with Zero Transmittance in the Black State

Son

Shin

Lee

2020

Adv Materials Inter

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The electrochromic mirror device (ECD) demonstrating transparent, mirror, and black states with zero transmittance in the black state is fabricated using facile dry deposition method. The device is capable of achieving both a highly reflective mirror and a complete black state. ECD is fabricated using a WO3 film deposited by nanoparticle deposition system (NPDS) and optical characteristics of its transparent, mirror, and black states are evaluated. Notably, the device demonstrates the mirror state with high reflectance over 80% and a black state that completely blocks the entire visible light, resulting in nearly zero transmittance. Device durability is evaluated over 100 cycles; the transmittance of the black and transparent states is measured to be 9.61%, 79.6% at its wavelength of 680 nm, respectively. Moreover, the reflectance of the mirror state at the same wavelength is measured to be 73.1% and 72.7% for the first and 100th cycles, respectively. Microstructural observations suggest that the visible light‐blocking effect is a consequence of the rough surface obtained using NPDS, which leads to uneven electrodeposition of Ag ions to produce localized surface plasmon resonance. Dry deposition method of the electrochromic layer is an excellent method for fabricating high‐contrast three‐mode electrochromic mirrors.

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New switchable mirror device with a counter electrode based on reversible electrodeposition

Cited by 31 publications

References 46 publications

Reversible Metal Electrodeposition Devices: An Emerging Approach to Effective Light Modulation and Thermal Management

Reversible Metal Electrodeposition Devices: An Emerging Approach to Effective Light Modulation and Thermal Management

Reflective‐Type Transparent/Colored Mirror Switchable Device Using Reversible Electrodeposition with Fabry–Perot Interferometer

Facile Fabrication of Trimodal Switchable Mirror Device with Zero Transmittance in the Black State

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