Flexible organic leds with parylene thin films for biological implants

Yamamura, T.; Kitamura, M.; Kuribayashi, Kaori; Arakawa, Yasuhiko; Takeuchi, Shin

doi:10.1109/memsys.2007.4433128

Cited by 9 publications

(4 citation statements)

References 4 publications

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“…We used a commercial LED (E1L52‐SC1A*‐03, peak emission wavelength: 510 nm, Toyoda Gosei, Co., Ltd., Japan) as well as a homemade OLED consisting of a light emitting polymer (ADS100RE, peak emission wavelength: 585 nm, American Dye Source, Inc., USA) which was fabricated using the method described elsewhere [13]. We tested the two sets in the fluorescence imaging system as the feasibility study of light source integrations with the CMOS imager (Fig.…”

Section: Methodsmentioning

confidence: 99%

Portable imaging system for on‐site analysis using CMOS imager—microfluidic analysis and fluorescence imaging

Misawa

Takeuchi

2011

IEEJ Transactions Elec Engng

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This paper reports on a portable imaging system using a complementary metal oxide semiconductor (CMOS) imager for microfluidic analysis and fluorescence imaging with an organic light emitting diode (OLED). The portable CMOS imager is useful for onsite microfluidic analysis, and the OLED works as a light source for fluorescent observations. The system needs only five elements: a laptop computer, a CMOS imaging device, an optical filter, microfluidic channels, and OLEDs. Using this system, we succeeded in a bead‐based microfluidic assay, capturing the video of the trapping and releasing process. Furthermore, we observed the fluorescent beads and the dye using an OLED as the light source in this system. As a result, we found that (i) submillimeter objects could be in focus with about 1 mm distance from CMOS imaging device surface without a lens; (ii) microfluidic experiments with poly(dimethylsiloxane) channels were possible on the CMOS imager; and (iii) OLED can potentially be used as a light source for this system. We believe that this system is useful for point‐of‐care diagnostic sensing and onsite microfluidic analysis including fluorescence detection. © 2011 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Section: Methodsmentioning

confidence: 99%

Portable imaging system for on‐site analysis using CMOS imager—microfluidic analysis and fluorescence imaging

Misawa

Takeuchi

2011

IEEJ Transactions Elec Engng

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“…Any new substrate must be mechanically and chemically compatible with previously optimized device structures and fabrication processes. While metal and organic layers are easily deposited on flexible parylene membranes, 23 finding a suitable transparent conducting electrode is more challenging. Key performance metrics are optical transparency and sheet resistance.…”

Section: Vapor-deposited Parylene Substratesmentioning

confidence: 99%

In situ vapor-deposited parylene substrates for ultra-thin, lightweight organic solar cells

Jean

Wang

Bulović

2016

Organic Electronics

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We fabricate the thinnest (1.3 µm) and lightest (3.6 g/m 2) solar cells yet demonstrated, with weight-specific power exceeding 6 W/g, in order to illustrate the lower limits of substrate thickness and materials use achievable with a new processing paradigm. Our fabrication process uniquely starts with growth of an ultra-thin flexible polymer substrate in vacuum, followed by deposition of electrodes and photoactive layers in situ. With this process sequence, the entire cell-from transparent substrate to active layers to encapsulation-can be fabricated at room temperature without solvents and without breaking vacuum, avoiding exposure to dust and other contaminants, and minimizing damage risk associated with handling of thin substrates. We use in situ vapor-phase growth of smooth, transparent, and flexible parylene-C films to produce ultrathin, lightweight molecular organic solar cells as thin as 2.3 µm including encapsulation with a second parylene-C film. These parylene-based devices exhibit power conversion efficiencies and fabrication yields comparable to glass-based cells. Flexible solar cells on parylene membranes can be seamlessly adhered to a variety of solid surfaces to provide additive solar power.

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“…The next generation of optoelectronic devices is likely to include mechanical flexibility and it is expected to enable new applications which are not possible using currently available glass-based planar technology. The recent growing interest in the development of flexible optoelectronic materials has been spurred by the continuing evolution of large-area applications such as organic light emitting diodes (OLEDs), liquid crystal displays (LCDs), touch panels, solar cells, solid-state lighting (SSL), biomedical devices, and mechanical energy harvesters [1][2][3][4][5][6]. Such devices offer additional advantages, such as thin profiles, low-cost, large-area, light weight, conformability, robustness, and ease of roll-to-roll manufacturing [7].…”

Section: Overviewmentioning

confidence: 99%

Degradation studies of flexible optoelectronic device electrodes

Bejitual¹

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Theodros S. Bejitual Flexible transparent electrodes offer significant advantages, such as low cost, large area, light weight, conformability, robustness, and ease of roll-to-roll manufacturing and processing. They are routinely used as anodes in organic light emitting diodes, liquid crystal displays, touch panels, solar cells, solid state lightings, energy harvesting, and biomedical applications to name a few examples. However, the electromechanical and corrosion issues involved when the device is stressed and/or in contact with acid containing components both during manufacturing and/or in service conditions have to be investigated in order to improve, and predict reliability. The primary objective of this research is to investigate the degradation behavior of two types of flexible transparent conducting layers, indium tin oxide (ITO) and carbon nanotubes (CNT) on polymer substrates, under electromechanical and corrosion conditions. Changes in electrical resistance and morphological features of these thin film electrodes are investigated using experimental methods such as corrosion, bending, fatigue, bending-corrosion, fatigue-corrosion, and tribo-corrosion. Such methods attempt to simulate induced stresses during manufacturing and/or in-service conditions. Studies on both patterned and non-patterned surfaces are performed. Furthermore, finite element modeling is used to simulate the stress/strain distribution of the electrodes under various deformation modes. The effects and synergies of corrosion, applied strain, film thickness, and number of bending cycles on the electrical and structural integrity of the electrodes are investigated using design of experiment methods. During this project it was found that CNT-based electrodes outperform their ITO counterparts under fatigue in corrosive environments. However, for most high current electronic devices ITO still needs to be utilized. During combined fatigue corrosion experiments of ITO-coated polymer electrodes externally applied strain was found to be the most critical factor for degradation. Experimental analysis and modeling of thin film electrodes for flexible optoelectronics will aid towards the design of more reliable devices in the future.

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Flexible organic leds with parylene thin films for biological implants

Cited by 9 publications

References 4 publications

Portable imaging system for on‐site analysis using CMOS imager—microfluidic analysis and fluorescence imaging

Portable imaging system for on‐site analysis using CMOS imager—microfluidic analysis and fluorescence imaging

In situ vapor-deposited parylene substrates for ultra-thin, lightweight organic solar cells

Degradation studies of flexible optoelectronic device electrodes

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