Fiber-based quantum-dot pulse oximetry for wearable health monitoring with high wavelength selectivity and photoplethysmogram sensitivity

Lee, Ho Seung; Noh, Byeongju; Kong, Seong Uk; Hwang, Yong Il; Cho, Ha‐Eun; Jeon, Yongmin; Choi, Kyung Cheol

doi:10.1038/s41528-023-00248-1

Cited by 10 publications

(3 citation statements)

References 42 publications

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“…The images of the electrodes utilized in the analysis are shown in Figure S1 of the Supporting Information. The microcavity effect is influenced by a range of factors, including the electrode’s reflectance and transmittance, as well as the distance between each electrode, i.e., the overall thickness of the organic layer . The light generated internally within the OLED was reflected between the Ag and Al electrodes, and the constructive interference induced by light possessing identical phases amplified the magnitude of a particular wavelength.…”

Section: Resultsmentioning

confidence: 99%

Wearable and Wavelength-Tunable Near-Infrared Organic Light-Emitting Diodes for Biomedical Applications

Cho,

Choi,

Park

et al. 2023

ACS Appl. Mater. Interfaces

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Section: Resultsmentioning

confidence: 99%

Wearable and Wavelength-Tunable Near-Infrared Organic Light-Emitting Diodes for Biomedical Applications

Cho,

Choi,

Park

et al. 2023

ACS Appl. Mater. Interfaces

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“…Therefore, placing active layers composed of high modulus materials on the neutral mechanical plane can mitigate device failures caused by material damage, such as fractures. By optimizing the thickness of top/bottom passivation layers (or substrates), the location of neutral mechanical planes can be adjusted [ 74 , 75 ].…”

Section: Structural Approaches For the Fabrication Of Stretchable Ledsmentioning

confidence: 99%

Structural and Material-Based Approaches for the Fabrication of Stretchable Light-Emitting Diodes

Park,

Kim

2023

Micromachines

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Stretchable displays, capable of freely transforming their shapes, have received significant attention as alternatives to conventional rigid displays, and they are anticipated to provide new opportunities in various human-friendly electronics applications. As a core component of stretchable displays, high-performance stretchable light-emitting diodes (LEDs) have recently emerged. The approaches to fabricate stretchable LEDs are broadly categorized into two groups, namely “structural” and “material-based” approaches, based on the mechanisms to tolerate strain. While structural approaches rely on specially designed geometries to dissipate applied strain, material-based approaches mainly focus on replacing conventional rigid components of LEDs to soft and stretchable materials. Here, we review the latest studies on the fabrication of stretchable LEDs, which is accomplished through these distinctive strategies. First, we introduce representative device designs for efficient strain distribution, encompassing island-bridge structures, wavy buckling, and kirigami-/origami-based structures. For the material-based approaches, we discuss the latest studies for intrinsically stretchable (is-) electronic/optoelectronic materials, including the formation of conductive nanocomposite and polymeric blending with various additives. The review also provides examples of is-LEDs, focusing on their luminous performance and stretchability. We conclude this review with a brief outlook on future technologies.

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“…The sensor includes a photodiode (PD) and a light−emitting diode (LED). There are two types of PPG sensors, transmission [6] and reflection [7,8] sensors, and the reflection type is commonly used in wearable devices. The light emitted by the LED is reflected by human blood and tissues and then received by the PD.…”

Section: Introductionmentioning

confidence: 99%

Development of Visible Multi−Bandpass Filter Based on F−P Structure

Jiang,

Fan,

et al. 2023

Coatings

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In order to reduce the noise interference of smart wearable devices, spectral filtering technology is used to suppress noise. This technology prevents interference signals from entering the detector from the source, thereby achieving high−precision noise reduction processing. According to the system requirements, a multi−bandpass filter with a wavelength range of 400~1000 nm was designed and prepared on a BK7 substrate. Ta2O5 and SiO2 were selected as the high− and low−refractive−index materials, respectively. By analyzing the −Fabry–Perot narrowband theory, the bandwidth matching coefficient was computed, and the interference order was calculated using the interval of the transmission peak wavelengths. Multiple F−P coating systems were connected through the matching layer to adjust the position of the transmission peak and broaden the bandwidth range. The design was optimized using Macloed film system design software, resulting in the design of a wide half−wave and cutoff multi−bandpass filter. The appropriate preparation process was chosen based on changes in refractive index, surface roughness, and the temperature gradient of the materials. The filter was then produced using Leybold SYRUSpro1110. Sensitivity, filter roughness, and the weak absorption of the film system were tested, and the results met the system requirements.

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Fiber-based quantum-dot pulse oximetry for wearable health monitoring with high wavelength selectivity and photoplethysmogram sensitivity

Cited by 10 publications

References 42 publications

Wearable and Wavelength-Tunable Near-Infrared Organic Light-Emitting Diodes for Biomedical Applications

Wearable and Wavelength-Tunable Near-Infrared Organic Light-Emitting Diodes for Biomedical Applications

Structural and Material-Based Approaches for the Fabrication of Stretchable Light-Emitting Diodes

Development of Visible Multi−Bandpass Filter Based on F−P Structure

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