Pulse Oximetry Using Organic Optoelectronics under Ambient Light

Han, Dongil; Khan, Yasser; Ting, Jonathan; Zhu, Juan; Combe, Craig; Wadsworth, Andrew; McCulloch, Iain; Arias, Ana Claudia

doi:10.1002/admt.201901122

Cited by 53 publications

(61 citation statements)

References 31 publications

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“…Soft and stretchable optoelectronics sensing for transmissive PPG measurement was demonstrated by Biswas, et al [ 83 ]. An interesting approach not requiring an LED but rather using ambient light for PPG sensing was demonstrated by Han, et al; with this approach, PPG signals with distinguishable heartbeat peaks were recorded and corresponding pulse oximetry readings were obtained [ 84 ].…”

Section: Current Sensor Technologymentioning

confidence: 99%

Wearable Sensors Incorporating Compensatory Reserve Measurement for Advancing Physiological Monitoring in Critically Injured Trauma Patients

Convertino

Schauer

Weitzel

et al. 2020

Sensors

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Vital signs historically served as the primary method to triage patients and resources for trauma and emergency care, but have failed to provide clinically-meaningful predictive information about patient clinical status. In this review, a framework is presented that focuses on potential wearable sensor technologies that can harness necessary electronic physiological signal integration with a current state-of-the-art predictive machine-learning algorithm that provides early clinical assessment of hypovolemia status to impact patient outcome. The ability to study the physiology of hemorrhage using a human model of progressive central hypovolemia led to the development of a novel machine-learning algorithm known as the compensatory reserve measurement (CRM). Greater sensitivity, specificity, and diagnostic accuracy to detect hemorrhage and onset of decompensated shock has been demonstrated by the CRM when compared to all standard vital signs and hemodynamic variables. The development of CRM revealed that continuous measurements of changes in arterial waveform features represented the most integrated signal of physiological compensation for conditions of reduced systemic oxygen delivery. In this review, detailed analysis of sensor technologies that include photoplethysmography, tonometry, ultrasound-based blood pressure, and cardiogenic vibration are identified as potential candidates for harnessing arterial waveform analog features required for real-time calculation of CRM. The integration of wearable sensors with the CRM algorithm provides a potentially powerful medical monitoring advancement to save civilian and military lives in emergency medical settings.

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Section: Current Sensor Technologymentioning

confidence: 99%

Wearable Sensors Incorporating Compensatory Reserve Measurement for Advancing Physiological Monitoring in Critically Injured Trauma Patients

Convertino

Schauer

Weitzel

et al. 2020

Sensors

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“…More recently, an ambient light oximeter (ALO), which works without the need for LEDs, was reported. [230] Two OPDs were utilized; the first a PCDTBT:PC 71 BM BHJ blend, and the second a P3HT:O-IDTBR BHJ blend. The ALO displays the potential to overcome the issues associated with devices that make use of a single OPD with two colored LEDs, since the power consumption of an ambient light oximeter is lower and it does not need the same level of optoelectronic driving hardware.…”

Section: The Bulk Heterojunction In Organic Photodetectorsmentioning

confidence: 99%

The Bulk Heterojunction in Organic Photovoltaic, Photodetector, and Photocatalytic Applications

et al. 2020

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Organic semiconductors require an energetic offset in order to photogenerate free charge carriers efficiently, owing to their inability to effectively screen charges. This is vitally important in order to achieve high power conversion efficiencies in organic solar cells. Early heterojunction‐based solar cells were limited to relatively modest efficiencies (<4%) owing to limitations such as poor exciton dissociation, limited photon harvesting, and high recombination losses. The development of the bulk heterojunction (BHJ) has significantly overcome these issues, resulting in dramatic improvements in organic photovoltaic performance, now exceeding 18% power conversion efficiencies. Here, the design and engineering strategies used to develop the optimal bulk heterojunction for solar‐cell, photodetector, and photocatalytic applications are discussed. Additionally, the thermodynamic driving forces in the creation and stability of the bulk heterojunction are presented, along with underlying photophysics in these blends. Finally, new opportunities to apply the knowledge accrued from BHJ solar cells to generate free charges for use in promising new applications are discussed.

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Section: Photoplethysmography (Ppg) Sensorsmentioning

confidence: 99%

“…Very recently, Han et al reported a novel approach to achieving pulse oximetry through combining the spectral filters covered PD‐OPDs and the ambient light as source, circumventing the use of LEDs. [ 134 ] The poly[ N ‐9″‐hepta‐decanyl‐2,7‐carbazole‐ alt ‐5,5‐(4′,7′‐di‐2‐thienyl‐2′,1′,3′‐benzothiadiazole)] (PCDTBT):PC 71 BM blends or P3HT:((5Z,5′Z)‐5,5′‐(((4,4,9,9‐tetraoctyl‐4,9‐dihydro‐ s ‐indaceno [1,2‐b:5,6‐b′]‐dithiophene‐2,7‐diyl) bis(benzo[ c ][1,2,5]thiadiazole‐7,4‐diyl))bis(methanylylidene))bis(3‐ethyl‐2‐thioxothiazolidin‐4‐one)) (O‐IDTBR) blends was employed as active layer, which enabled the PD‐OPDs to detect green, red, and NIR light. The PD‐OPDs were printed on the flexible substrates by blade coating technique, which can be well fitted with human body, such as fingers.…”

Section: Applications Of Broadband Organic Photodetectors In Sensorsmentioning

confidence: 99%

Recent Progress on Broadband Organic Photodetectors and their Applications

Zhao

Niu

et al. 2020

Laser & Photonics Reviews

203

158

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As a promising candidate for next-generation photodetectors, organic photodetectors (OPDs) outperform the commercial inorganic photodetectors in terms of solution and large-area processability, mechanical flexibility, tunable spectral response range, low-cost manufacturing, and light weight. The OPDs with broadband spectral response attract an extensive attention due to their potential in wide application fields, such as flexible image sensing, surveillance, and health monitoring. In this review, recent advances in broadband OPDs are summarized as two sections: i) Photodiode type OPDs (PD-OPDs) based on thick-film strategy, ternary strategy, interfacial engineering, and multilayered strategy. ii) Photomultiplication type OPDs (PM-OPDs) with traps in active layer, traps in interfacial layer, and charge blocking layer. Some real applications on image sensors and photoplethysmography (PPG) sensors are also introduced on the basis of broadband OPDs. New insights on developing the broadband OPDs are put forward for improvement of broadband OPDs.

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Pulse Oximetry Using Organic Optoelectronics under Ambient Light

Cited by 53 publications

References 31 publications

Wearable Sensors Incorporating Compensatory Reserve Measurement for Advancing Physiological Monitoring in Critically Injured Trauma Patients

Wearable Sensors Incorporating Compensatory Reserve Measurement for Advancing Physiological Monitoring in Critically Injured Trauma Patients

The Bulk Heterojunction in Organic Photovoltaic, Photodetector, and Photocatalytic Applications

Recent Progress on Broadband Organic Photodetectors and their Applications

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