Fiber Shaped Light Emitting Device

O’Connor, Brendan; An, Kwang H.; Zhao, Yiying; Pipe, Kevin P.; Shtein, Max

doi:10.1002/adma.200700627

Cited by 146 publications

(111 citation statements)

References 39 publications

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“…However, with the development of organic light‐emitting diodes (OLEDs), in terms of materials and process technology, the demonstration of fiber‐type OLED devices became possible. In 2007, O'Connor et al demonstrated fiber‐type OLEDs using PI‐coated silica fibers, having a structure of Al/Ni/copper phthalocyanine/N,N′‐di‐1‐naphthyl‐N,N′‐diphenyl‐1,1′‐biphenyl‐4,4′‐diamine/tris(8‐hydroxyquinoline) aluminum/LiF/Al, deposited by thermal evaporation ( Figure a) . The fiber OLEDs had current density–voltage characteristics similar to those fabricated on planar substrates, and interestingly, the fiber OLEDs showed emission spectra that are invariant with viewing direction attributing to the emission from small OLEDs around the circumference of the fiber …”

Section: Textile‐based Electronic Devices and Systemsmentioning

confidence: 99%

Section: Textile‐based Electronic Devices and Systemsmentioning

confidence: 99%

“…However, with the development of organic light-emitting diodes (OLEDs), in terms of materials and process technology, the demonstration of fiber-type OLED devices became possible. In 2007, O'Connor et al demonstrated fiber-type OLEDs using PI-coated silica fibers, [54] having a structure of Al/ Ni/copper phthalocyanine/N,N′-di-1-naphthyl-N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine/tris(8-hydroxyquinoline) aluminum/ LiF/Al, deposited by thermal evaporation (Figure 3a). [54] The fiber OLEDs had current density-voltage characteristics similar Small 2018, 14, 1703034 Figure 2.…”

Section: Displaysmentioning

confidence: 99%

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Recent Progress of Textile‐Based Wearable Electronics: A Comprehensive Review of Materials, Devices, and Applications

Heo

Eom

Kim

et al. 2017

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Wearable electronics are emerging as a platform for next-generation, human-friendly, electronic devices. A new class of devices with various functionality and amenability for the human body is essential. These new conceptual devices are likely to be a set of various functional devices such as displays, sensors, batteries, etc., which have quite different working conditions, on or in the human body. In these aspects, electronic textiles seem to be a highly suitable possibility, due to the unique characteristics of textiles such as being light weight and flexible and their inherent warmth and the property to conform. Therefore, e-textiles have evolved into fiber-based electronic apparel or body attachable types in order to foster significant industrialization of the key components with adaptable formats. Although the advances are noteworthy, their electrical performance and device features are still unsatisfactory for consumer level e-textile systems. To solve these issues, innovative structural and material designs, and novel processing technologies have been introduced into e-textile systems. Recently reported and significantly developed functional materials and devices are summarized, including their enhanced optoelectrical and mechanical properties. Furthermore, the remaining challenges are discussed, and effective strategies to facilitate the full realization of e-textile systems are suggested.

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Section: Textile‐based Electronic Devices and Systemsmentioning

confidence: 99%

Section: Textile‐based Electronic Devices and Systemsmentioning

confidence: 99%

Section: Displaysmentioning

confidence: 99%

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Recent Progress of Textile‐Based Wearable Electronics: A Comprehensive Review of Materials, Devices, and Applications

Heo

Eom

Kim

et al. 2017

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281

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“…Note that some attempts have been made to fabricate electroluminescent fibres based on OLEDs and inorganic phosphors (www.laserfocusworld.com/articles/ 2013/07/thread-becomes-functional-oled-emitter.html and www. lytec-asia.com/products.html) 42 , but complicated fabrication processes are typically required.…”

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confidence: 99%

A colour-tunable, weavable fibre-shaped polymer light-emitting electrochemical cell

et al. 2015

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The emergence of wearable electronics and optoelectronics requires the development of devices that are not only highly flexible but can also be woven into textiles to offer a truly integrated solution. Here, we report a colour-tunable, weavable fibre-shaped polymer light-emitting electrochemical cell (PLEC). The fibre-shaped PLEC is fabricated using all-solutionbased processes that can be scaled up for practical applications. The design has a coaxial structure comprising a modified metal wire cathode and a conducting aligned carbon nanotube sheet anode, with an electroluminescent polymer layer sandwiched between them. The fibre shape offers unique and promising advantages. For example, the luminance is independent of viewing angle, the fibre-shaped PLEC can provide a variety of different and tunable colours, it is lightweight, flexible and wearable, and it can potentially be woven into light-emitting clothes for the creation of smart fabrics. L ight-emitting electrochemical cells 1-6 , in particular polymer light-emitting electrochemical cells (PLECs), have been widely studied for various applications, including flexible flat panel displays, signage and lighting 4-6 . Like organic light-emitting diodes (OLEDs) and polymer light-emitting diodes (PLEDs), PLECs have a structure that is usually composed of two metal electrodes connected to an organic semiconductor. However, PLECs differ in that mobile ions are incorporated into the organic semiconductor, thereby offering promising advantages such as low operating voltage, high electron/photon conversion efficiency and high power efficiency compared with OLEDs 7-18 . More importantly, PLECs do not require the use of low-workfunction cathodes composed of calcium or magnesium (which are sensitive in air). In contrast, PLEDs require a low-workfunction cathode and high-workfunction anode to realize efficient charge injection 19-21 . In a typical PLEC, the electroluminescent polymer layer forms an in situ light-emitting p-i-n junction for the injection of both electrons and holes from the electrodes 4,5,22 . This means that PLECs can be effectively operated with relatively rougher surfaces than is generally possible with OLEDs and PLEDs, which is advantageous when scaling them up for practical applications with low cost and high efficiency 23-25 .Based on these described advantages, the PLEC is particularly promising for use in portable and wearable electronics, which are being developed for a wide range of applications, from microelectronics to biomedicine, transport and areospace 26-32 . Conventional planar light-emitting devices, including both rigid and flexible films, cannot satisfy the basic requirements for such an application, including softness, light weight and weavability 33,34 . To this end, advances in the textile industry have suggested a useful direction in which to pursue a solution: if a PLEC is made into a continuous fibre using a melting or all-solution-based process, it can be woven into various flexible textiles or integrated into soft substrates for u...

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“…[4][5][6][7] The first reports of EL fibers relied on traditional vapor deposition processes which required a special robotic system to rotate the fiber and achieve layer uniformity during deposition. [8,9] The development of solution-processed electroluminescent (EL) material systems has enabled continuous deposition onto cylindrical and fiber-shaped surfaces.…”

Section: Introductionmentioning

confidence: 99%

Rapid Prototyping of Slot Die Devices for Roll to Roll Production of EL Fibers

Bellingham

Bromhead

Fontecchio

2017

Preprint

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There is a growing interest in fibers supporting optoelectrical properties for textile and wearable display applications. Solution-processed electroluminescent (EL) material systems can be continuously deposited onto fiber or yarn substrates in a roll-to-roll process, making it easy to scale manufacturing. It is important to have precise control over layer deposition to achieve uniform and reliable light emission from these EL fibers. Slot-die coating offers this control and increases the rate of EL fiber production. Here, we report a highly adaptable, cost-effective 3D printing model for developing slot dies used in automatic coating systems. The resulting slot-die coating system enables rapid, reliable production of alternating current powder-based EL (ACPEL) fibers and can be adapted for many material systems. The benefits of this system over dip-coating for roll-to-roll production of EL fibers are demonstrated in this work.

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Fiber Shaped Light Emitting Device

Cited by 146 publications

References 39 publications

Recent Progress of Textile‐Based Wearable Electronics: A Comprehensive Review of Materials, Devices, and Applications

Recent Progress of Textile‐Based Wearable Electronics: A Comprehensive Review of Materials, Devices, and Applications

A colour-tunable, weavable fibre-shaped polymer light-emitting electrochemical cell

Rapid Prototyping of Slot Die Devices for Roll to Roll Production of EL Fibers

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