Stretchable Electronics: Distortion‐Free Stretchable Light‐Emitting Diodes via Imperceptible Microwrinkles (Adv. Mater. Technol. 9/2020)

Jeong, Sujin; Yoon, Hyungsoo; Lee, Byeongmoon; Lee, Seung Hwan; Hong, Yongtaek

doi:10.1002/admt.202070057

Cited by 10 publications

(12 citation statements)

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“…This problem may be addressed according to a recent report of directly depositing PLED on prestretched substrate to improve the predictability of the 2D wrinkles. [ 52 ]…”

Section: Critical Materials and Processing For Structure‐enabled Stre...mentioning

confidence: 99%

Structures and Materials in Stretchable Electroluminescent Devices

Yin

Youssef

et al. 2021

Advanced Materials

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Stretchable electroluminescent (EL) devices are obtained by partitioning a large emission area into areas specifically for stretching and light‐emission (island–bridge structure). Buckled and textile structures are also shown effective to combine the conventional light emitting diode fabrication with elastic substrates for structure‐enabled stretchable EL devices. Meanwhile, intrinsically stretchable EL devices which are characterized with uniform stretchability down to microscopic scale are relatively less developed but promise simpler device structure and higher impact resistance. The challenges in fabricating intrinsically stretchable EL devices with high and robust performance are in many facets, including stretchable conductors, emissive materials, and compatible processes. For the stretchable transparent electrode, ionically conductive gel, conductive polymer coating, and conductor network in surface of elastomer are all proven useful. The stretchable EL materials are currently limited to conjugated polymers, conjugated polymers with surfactants and ionic conductors added to boost stretchability, and phosphor particles embedded in elastomer matrices. These emissive materials operate under different mechanisms, require different electrode materials and fabrication processes, and the corresponding EL devices face distinctive challenges. This review aims to provide a basic understanding of the materials meeting both the mechanical and electronic requirements and important techniques to fabricate the stretchable EL devices.

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“…This problem may be addressed according to a recent report of directly depositing PLED on prestretched substrate to improve the predictability of the 2D wrinkles. [ 52 ]…”

Section: Critical Materials and Processing For Structure‐enabled Stre...mentioning

confidence: 99%

Structures and Materials in Stretchable Electroluminescent Devices

Yin

Youssef

et al. 2021

Advanced Materials

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“…[ 40,48–52 ] Additionally, stretchable OLEDs have gained a lot of attention and are extremely promising for wearable devices, which usually experience both bending and tensile strain. [ 48,52–58 ] Despite the great promise in achieving highly flexible light‐emitting devices, the use of OLEDs in medicine typically requires device lifetimes ranging from few hours in case of plaster‐type wearables up to years when used as implants. In addition, for many applications the devices have to withstand harsh environmental conditions, in particular high humidity and/or immersion into water.…”

Section: Oled Requirements For Biomedical Applicationsmentioning

confidence: 99%

Emerging Biomedical Applications of Organic Light‐Emitting Diodes

Murawski

Gather

2021

Advanced Optical Materials

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As solid‐state light sources based on amorphous organic semiconductors, organic light‐emitting diodes (OLEDs) are widely used in modern smartphone displays and TVs. Due to the dramatic improvements in stability, efficiency, and brightness achieved over the last three decades, OLEDs have also become attractive light sources for compact and “imperceptible” biomedical devices that use light to probe, image, manipulate, or treat biological matter. The inherent mechanical flexibility of OLEDs and their compatibility with a wide range of substrates and geometries are of particular benefit in this context. Here, recent progress in the development and use of OLEDs for biomedical applications is reviewed. The specific requirements that this poses are described and compared to the current state of the art, in particular in terms of the brightness, patterning, stability, and encapsulation of OLEDs. Examples from several main areas are then discussed in some detail: on‐chip sensing and integration with microfluidics, wearable devices for optical monitoring, therapeutic devices, and the emerging use in neuroscience for targeted photostimulation via optogenetics. The review closes with a brief outlook on future avenues to scale the manufacturing of OLED‐based devices for biomedical use.

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“…This is a major setback in the implementation of this design for obtaining high spatial resolution for displays. [ 33 ]…”

Section: Introductionmentioning

confidence: 99%

“…Alternatively, prewrinkling/prebuckling technique has been used for fabrication of stretchable organic solar cells [ 10,34,35 ] and LEDs [ 33 ] on PDMS substrates. The technique involves prestretching of the PDMS substrates before depositing intrinsically nonstretchable thin layers of the devices, [ 10,33–35 ] leading to wavy wrinkled/buckled structures after the strains (through the prestretching) have been removed. This structural design gives rise to stretchable devices whose electrical and optical properties are maintained before and after the formation of the wrinkled structures.…”

Section: Introductionmentioning

confidence: 99%

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Failure Mechanisms of Stretchable Perovskite Light‐Emitting Devices under Monotonic and Cyclic Deformations

Adeniji

Oyewole

Koech

et al. 2021

Macro Materials & Eng

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This paper presents the results of experimental and analytical studies of the failure mechanisms of stretchable perovskite light‐emitting devices (PeLEDs). The multilayered PeLED structures consist of an anodic layer of poly(3,4‐ethylenedioxythiophene):polystyrene‐sulfonate (PEDOT:PSS), an emissive layer of methylammonium lead bromide (MAPbBr3), and a eutectic gallium–indium (EGaIn) cathodic layer, which are deposited onto treated polydimethylsiloxane substrates. The intrinsically nonstretchable MAPbBr3 and PEDOT:PSS are modified with poly(ethylene oxide). The failure mechanisms of the layered stretchable PeLED structures are then investigated under monotonic and cyclic deformations. The optical and scanning electron microscopy images show the deflection and propagation of cracks and wrinkles under applied strains. Cracking of perovskite crystal and debonding of films are also observed with increased cyclic deformation. The effects of the failure mechanisms on the optoelectronic properties of the devices are then studied. The in situ measured transmittance of the PEDOT:PSS (≈75%) reduces with increasing uniaxial strain, and then is increased close to its initial value when the strain is released. The turn‐on voltage of the device increases with increasing number of cycles between 50 and 1000 cycles at 20% strain level. The fatigue lifetimes of the PeLED structures are used to explain the design of stretchable perovskite devices.

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Stretchable Electronics: Distortion‐Free Stretchable Light‐Emitting Diodes via Imperceptible Microwrinkles (Adv. Mater. Technol. 9/2020)

Cited by 10 publications

References 0 publications

Structures and Materials in Stretchable Electroluminescent Devices

Structures and Materials in Stretchable Electroluminescent Devices

Emerging Biomedical Applications of Organic Light‐Emitting Diodes

Failure Mechanisms of Stretchable Perovskite Light‐Emitting Devices under Monotonic and Cyclic Deformations

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