Ag fiber/IZO Composite Electrodes: Improved Chemical and Thermal Stability and Uniform Light Emission in Flexible Organic Light-Emitting Diodes

Choi, Junho; Park, Cheol Hwee; Kwack, Jin Ho; Lee, Jun Young; Kim, Jae Geun; Choi, Jaemyeong; Bae, Bong Han; Park, Soo Jong; Kim, Enjung; Park, Young Wook; Ju, Byeong Kwon

doi:10.1038/s41598-018-37105-5

Cited by 15 publications

(13 citation statements)

References 36 publications

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“…Recently, foldable displays have received great attention in state-of-art mobile display due to their unique design, light weight, and large area screen [4][5][6][7]. For the commercialization of foldable displays, it is necessary to develop key components, such as foldable organic light-emitting diodes (OLED), foldable thin-film transistors (TFTs), high-performance plastic substrates to replace rigid glass substrates, and transparent and flexible cover window for flexible displays [8]. In addition, for the mass production of flexible cover windows, transparent hard coating (HC) films should be coated on flexible window substrates using a roll-to-roll (R2R) coating process [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Transparent and Flexible SiOC Films on Colorless Polyimide Substrate for Flexible Cover Window

et al. 2021

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We fabricated transparent and flexible silicon oxycarbide (SiOC) hard coating (HC) films on a colorless polyimide substrate to use as cover window films for flexible and foldable displays using a reactive roll-to-roll (R2R) sputtering system at room temperature. At a SiOC thickness of 100 nm, the R2R-sputtered SiOC film showed a high optical transmittance of 87.43% at a visible range of 400 to 800 nm. The R2R-sputtered SiOC films also demonstrated outstanding flexibility, which is a key requirement of foldable and flexible displays. There were no cracks or surface defects on the SiOC films, even after bending (static folding), folding (dynamic folding), twisting, and rolling tests. Furthermore, the R2R-sputtered SiOC film showed good scratch resistance in a pencil hardness test (550 g) and steel wool test under a load of 250 g. To test the impact protection ability, we compared the performance of thin-film heaters (TFHs) and oxide-semiconductor-based thin-film transistors (TFTs) with and without SiOC cover films. The similar performance of the TFHs and TFTs with the SiOC cover window films demonstrate that the R2R-sputtered SiOC films offer promising cover window films for the next generation of flexible or foldable displays.

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Section: Introductionmentioning

confidence: 99%

Transparent and Flexible SiOC Films on Colorless Polyimide Substrate for Flexible Cover Window

et al. 2021

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“…Great attention has been devoted to various flexible and transparent heaters (or electrodes) based on printed electronics due to different reasons such as devices having nonplanar and flexible substrates, the potential scarcity of indium, and the lack of transparency in the near-infrared spectrum [ 6 , 7 , 8 ]. In these printed electronic products, conductive materials with low resistance, high transmittance, high flexibility, etc., are essential in the performance of the devices, and various conductive materials such as transparent conductive oxide, metallic nanowires, conductive polymers, and carbon-based electrodes have been investigated [ 9 , 10 , 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Radio Frequency Induction Welding of Silver Nanowire Networks for Transparent Heat Films

Wen

Tak

et al. 2021

Materials

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Transparent heat films (THFs) are attracting increasing attention for their usefulness in various applications, such as vehicle windows, outdoor displays, and biosensors. In this study, the effects of induction power and radio frequency on the welding characteristics of silver nanowires (Ag NWs) and Ag NW-based THFs were investigated. The results showed that higher induction frequency and higher power increased the welding of the Ag NWs through the nano-welding at the junctions of the Ag NWs, which produced lower sheet resistance, and improved the adhesion of the Ag NWs. Using the inductive welding condition of 800 kHz and 6 kW for 60 s, 100 ohm/sq of Ag NW thin film with 95% transmittance at 550 nm after induction heating could be decreased to 56.13 ohm/sq, without decreasing the optical transmittance. In addition, induction welding of the Ag NW-based THFs improved haziness, increased bending resistance, enabled higher operating temperature at a given voltage, and improved stability.

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“…Transparent conducting electrodes (TCEs), with mechanical robustness and environmental stability, are essential components for flexible and wearable optoelectronic devices such as photovoltaics (PVs), organic light-emitting diodes (OLEDs), and touch-screen panels. − Conventional indium tin oxide (ITO) is the most widely used TCE material for thin-film optoelectronic devices because of its good optical transparency (> 80%) and excellent environmental stability. , Although ITO has various advantages, its inherently brittle nature limits its application in flexible devices. , Furthermore, conventional transparent plastic films  such as polyethylene naphthalate (PEN) and polyethylene terephthalate (PET)  hinder the use of crystalline ITO (c-ITO), which is necessary for achieving a higher performance than amorphous ITO (a-ITO) because a high temperature annealing process (> 250 °C), which can easily decompose conventional plastic films, is required to crystallize ITO. − …”

Section: Introductionmentioning

confidence: 99%

Flexible Transparent Crystalline-ITO/Ag Nanowire Hybrid Electrode with High Stability for Organic Optoelectronics

Jang

Jeon

et al. 2020

ACS Appl. Mater. Interfaces

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Metal nanowires (NWs) are promising transparent conducting electrode (TCE) materials because of their excellent optoelectrical performance, intrinsic mechanical flexibility, and large-scale processability. However, the surface roughness, thermal/chemical instability, and limited electrical conductivity associated with empty spaces between metal NWs are problems that are yet to be solved. Here, we report a highly reliable and robust composite TCE/substrate all-in-one platform that consists of crystalline indium tin oxide (c-ITO) top layer and surface-embedded metal NW (c-ITO/AgNW-GFRH) films for flexible optoelectronics. The c-ITO top layer (thickness: 10–30 nm) greatly improves the electrical performance of a AgNW-based electrode, retaining its transparency even after a high-temperature annealing process at 250 °C because of its thermally stable basal substrate (i.e., AgNW-GFRH). By introducing c-ITO thin film, we achieve an extremely smooth surface (R rms < 1 nm), excellent optoelectrical performance, superior thermal (> 250 °C)/chemical stability (in sulfur-contained solution), and outstanding mechanical flexibility (bending radius = 1 mm). As a demonstration, we fabricate flexible organic devices (organic photovoltaic and organic light-emitting diode) on c-ITO/AgNW-GFRH films that show device performance comparable to that of references ITO/glass substrates and superior mechanical flexibility. With excellent stability and demonstrations, we expect that the c-ITO/AgNW-GFRHs can be used as flexible TCE/substrate films for future thin-film optoelectronics.

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Ag fiber/IZO Composite Electrodes: Improved Chemical and Thermal Stability and Uniform Light Emission in Flexible Organic Light-Emitting Diodes

Cited by 15 publications

References 36 publications

Transparent and Flexible SiOC Films on Colorless Polyimide Substrate for Flexible Cover Window

Transparent and Flexible SiOC Films on Colorless Polyimide Substrate for Flexible Cover Window

Radio Frequency Induction Welding of Silver Nanowire Networks for Transparent Heat Films

Flexible Transparent Crystalline-ITO/Ag Nanowire Hybrid Electrode with High Stability for Organic Optoelectronics

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