Wearable Organic Optoelectronic Sensors for Medicine

Bansal, Ashu K.; Hou, S. Y.; Kulyk, Olena; Bowman, Eric; Samuel, Ifor D. W.

doi:10.1002/adma.201403560

Cited by 178 publications

(167 citation statements)

References 38 publications

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“…Unlike the inorganic optoelectronics used in commercially available pulse oximeters, the fl exible form factors of organic LEDs (OLEDs) and organic photodetectors (OPDs) allow for an oximeter that has a conformal fi t to the human body. [ 6,85 ] Lochner et al have demonstrated a transmission-mode pulse oximetry probe composed of solution-processed OLEDs and a printed OPD. [ 6 ] The active layer of the OPD is a bulk heterojunction donor/acceptor blend of [6,6] .…”

Section: Reviewmentioning

confidence: 99%

“…[ 85 ] The OLED is placed in between the two OPDs, each with a different fi lter to allow the OPD to read light with a peak wavelength of 610 or 700 nm. The OLED and OPD were placed onto a subject's forearm with 20 mm spacing in order to probe the oxygen saturation of muscle tissue, and successfully showed the change in the concentration of oxy-hemoglobin in the tissue upon induction and termination of ischemia induced in the arm.…”

Section: Reviewmentioning

confidence: 99%

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Monitoring of Vital Signs with Flexible and Wearable Medical Devices

et al. 2016

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Advances in wireless technologies, low-power electronics, the internet of things, and in the domain of connected health are driving innovations in wearable medical devices at a tremendous pace. Wearable sensor systems composed of flexible and stretchable materials have the potential to better interface to the human skin, whereas silicon-based electronics are extremely efficient in sensor data processing and transmission. Therefore, flexible and stretchable sensors combined with low-power silicon-based electronics are a viable and efficient approach for medical monitoring. Flexible medical devices designed for monitoring human vital signs, such as body temperature, heart rate, respiration rate, blood pressure, pulse oxygenation, and blood glucose have applications in both fitness monitoring and medical diagnostics. As a review of the latest development in flexible and wearable human vitals sensors, the essential components required for vitals sensors are outlined and discussed here, including the reported sensor systems, sensing mechanisms, sensor fabrication, power, and data processing requirements.

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Section: Reviewmentioning

confidence: 99%

Section: Reviewmentioning

confidence: 99%

Monitoring of Vital Signs with Flexible and Wearable Medical Devices

et al. 2016

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“…Interest in stretchable electronics has grown significantly in recent years, driving a need for soft and stretchable materials that can sustain high strains and still fulfill their function in applications such as human wearable sensors for biomechanics studies and health monitoring [1][2][3][4] , or feedback sensors in soft robotics. [5][6][7][8] Although many stretchable conductors exist, including liquid metals, [9,10] nanowires, [11,12] nanoribbons [13] , pre-stretched elastomer fibers with conductive coatings, [14] and micro-cracked metals, [15,16] these materials have generally been unable to achieve high levels of optical transparency while maintaining high conductivities and stretchability; a feature that would enable their use in optogenetics [17] or allow optical imaging of the underlying substrate.…”

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confidence: 99%

3D Printing of Transparent and Conductive Heterogeneous Hydrogel–Elastomer Systems

et al. 2017

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A hydrogel–dielectric‐elastomer system, polyacrylamide and poly(dimethylsiloxane) (PDMS), is adapted for extrusion printing for integrated device fabrication. A lithium‐chloride‐containing hydrogel printing ink is developed and printed onto treated PDMS with no visible signs of delamination and geometrically scaling resistance under moderate uniaxial tension and fatigue. A variety of designs are demonstrated, including a resistive strain gauge and an ionic cable.

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“…OLED is also an upcoming technology for solid state lighting5, since it can provide uniform illumination over a large area6 and offers the possibility for complex lighting designs and patterns. OLEDs have also been successfully implemented in wearable sensing devices for applications in medicine and robotics78.…”

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confidence: 99%

Effect of thermal annealing Super Yellow emissive layer on efficiency of OLEDs

Burns

MacLeod

Trang

et al. 2017

Sci Rep

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Thermal annealing of the emissive layer of an organic light emitting diode (OLED) is a common practice for solution processable emissive layers and reported annealing temperatures varies across a wide range of temperatures. We have investigated the influence of thermal annealing of the emissive layer at different temperatures on the performance of OLEDs. Solution processed polymer Super Yellow emissive layers were annealed at different temperatures and their performances were compared against OLEDs with a non-annealed emissive layer. We found a significant difference in the efficiency of OLEDs with different annealing temperatures. The external quantum efficiency (EQE) reached a maximum of 4.09% with the emissive layer annealed at 50 °C. The EQE dropped by ~35% (to 2.72%) for OLEDs with the emissive layers annealed at 200 °C. The observed performances of OLEDs were found to be closely related to thermal properties of polymer Super Yellow. The results reported here provide an important guideline for processing emissive layers and are significant for OLED and other organic electronics research communities.

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Wearable Organic Optoelectronic Sensors for Medicine

Cited by 178 publications

References 38 publications

Monitoring of Vital Signs with Flexible and Wearable Medical Devices

Monitoring of Vital Signs with Flexible and Wearable Medical Devices

3D Printing of Transparent and Conductive Heterogeneous Hydrogel–Elastomer Systems

Effect of thermal annealing Super Yellow emissive layer on efficiency of OLEDs

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