OLED-OPD Matrix for Sensing on a Single Flexible Substrate

Titov, I.P.; Köpke, Markus; Schneidewind, Nicole; Buhl, Janek; Murat, Yolande; Gerken, Martina

doi:10.1109/jsen.2020.2986051

Cited by 26 publications

(28 citation statements)

References 17 publications

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“…This background signal can be subtracted in the post processing of the raw data or simply suppressed by using a non-transparent microfluidic device. Recently, we suggested employing a black absorptive material combined with a PDMS microfluidic for successful suppression of stray light [30]. Consequently, we aim to integrate the OLED-OPD matrix with a microfluidic device as the next step.…”

Section: Nitrite Sensing With Oled-opd Matrixmentioning

confidence: 99%

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Monolithic Integrated OLED–OPD Unit for Point-of-Need Nitrite Sensing

Titov

Köpke

Gerken

2022

Sensors

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In this study, we present a highly integrated design of organic optoelectronic devices for Point-of-Need (PON) nitrite (NO2−) measurement. The spectrophotometric investigation of nitrite concentration was performed utilizing the popular Griess reagent and a reflection-based photometric unit with an organic light emitting diode (OLED) and an organic photodetector (OPD). In this approach a nitrite concentration dependent amount of azo dye is formed, which absorbs light around ~540 nm. The organic devices are designed for sensitive detection of absorption changes caused by the presence of this azo dye without the need of a spectrometer. Using a green emitting TCTA:Ir(mppy)3 OLED (peaking at ~512 nm) and a DMQA:DCV3T OPD with a maximum sensitivity around 530 nm, we successfully demonstrated the operation of the OLED–OPD pair for nitrite sensing with a low limit of detection 46 µg/L (1.0 µM) and a linearity of 99%. The hybrid integration of an OLED and an OPD with 0.5 mm × 0.5 mm device sizes and a gap of 0.9 mm is a first step towards a highly compact, low cost and highly commercially viable PON analytic platform. To our knowledge, this is the first demonstration of a fully organic-semiconductor-based monolithic integrated platform for real-time PON photometric nitrite analysis.

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Section: Nitrite Sensing With Oled-opd Matrixmentioning

confidence: 99%

“…Due to the thermal evaporation-based device fabrication technique, all sensing elements are permanently aligned, allowing a high degree of miniaturization. These units can be easily laminated to a microfluidic system for sensing applications in a liquid [30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Monolithic Integrated OLED–OPD Unit for Point-of-Need Nitrite Sensing

Titov

Köpke

Gerken

2022

Sensors

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“…Biomedical applications of OLEDs often require miniaturization or patterning of the devices to create high-density light-emitting arrays. Currently used techniques to integrate or pattern OLEDs for biomedical applications include the assembly of separate components deposited onto different substrates, [52,76] material evaporation through shadow masks, [77,78] photolithographic patterning of the bottom electrode, [79] and blade-coating. [80] Patterning of OLEDs to high-density micrometer scale pixels, however, remains a challenge and an active area of research for the organic community.…”

Section: Miniaturization and Patterningmentioning

confidence: 99%

“…Finally, the rejection of excitation light can also be improved by optimizing the detection geometry, e.g., changing from a transmission layout with OLED and detector sandwiching the sample cell to a reflection arrangement where the detector is arranged next to the OLED and the microfluidic channel with the analyte sitting on top of both (Figure 5e). [ 78 ] While this geometry can certainly be beneficial, in itself it did not suffice to allow detection of small concentrations of fluorescent dye.…”

Section: Emerging Biomedical Applicationsmentioning

confidence: 99%

Emerging Biomedical Applications of Organic Light‐Emitting Diodes

Murawski

Gather

2021

Advanced Optical Materials

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As solid‐state light sources based on amorphous organic semiconductors, organic light‐emitting diodes (OLEDs) are widely used in modern smartphone displays and TVs. Due to the dramatic improvements in stability, efficiency, and brightness achieved over the last three decades, OLEDs have also become attractive light sources for compact and “imperceptible” biomedical devices that use light to probe, image, manipulate, or treat biological matter. The inherent mechanical flexibility of OLEDs and their compatibility with a wide range of substrates and geometries are of particular benefit in this context. Here, recent progress in the development and use of OLEDs for biomedical applications is reviewed. The specific requirements that this poses are described and compared to the current state of the art, in particular in terms of the brightness, patterning, stability, and encapsulation of OLEDs. Examples from several main areas are then discussed in some detail: on‐chip sensing and integration with microfluidics, wearable devices for optical monitoring, therapeutic devices, and the emerging use in neuroscience for targeted photostimulation via optogenetics. The review closes with a brief outlook on future avenues to scale the manufacturing of OLED‐based devices for biomedical use.

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“…Based on our experience in biomedical lab-on-chip devices for multiplexed detection [12,13] and integrated optical measurement systems [14], we aimed at developing a multiplex microfluidic chip for continuous in situ soil nutrient measurements. We planned to use the established analysis methods, but for the continuous measurement, the task of automated extraction of soil solution into the microfluidic systems had to be solved.…”

Section: Introductionmentioning

confidence: 99%

Extraction of Soil Solution into a Microfluidic Chip

2021

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Collecting real-time data on physical and chemical parameters of the soil is a prerequisite for resource-efficient and environmentally sustainable agriculture. For continuous in situ measurement of soil nutrients such as nitrate or phosphate, a lab-on-chip approach combined with wireless remote readout is promising. For this purpose, the soil solution, i.e., the water in the soil with nutrients, needs to be extracted into a microfluidic chip. Here, we present a soil-solution extraction unit based on combining a porous ceramic filter with a microfluidic channel with a 12 µL volume. The microfluidic chip was fabricated from polydimethylsiloxane, had a size of 1.7 cm × 1.7 cm × 0.6 cm, and was bonded to a glass substrate. A hydrophilic aluminum oxide ceramic with approximately 37 Vol.-% porosity and an average pore size of 1 µm was integrated at the inlet. Soil water was extracted successfully from three types of soil—silt, garden soil, and sand—by creating suction with a pump at the other end of the microfluidic channel. For garden soil, the extraction rate at approximately 15 Vol.-% soil moisture was 1.4 µL/min. The amount of extracted water was investigated for 30 min pump intervals for the three soil types at different moisture levels. For garden soil and sand, water extraction started at around 10 Vol.-% soil moisture. Silt showed the highest water-holding capacity, with water extraction starting at approximately 13 Vol.-%.

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OLED-OPD Matrix for Sensing on a Single Flexible Substrate

Cited by 26 publications

References 17 publications

Monolithic Integrated OLED–OPD Unit for Point-of-Need Nitrite Sensing

Monolithic Integrated OLED–OPD Unit for Point-of-Need Nitrite Sensing

Emerging Biomedical Applications of Organic Light‐Emitting Diodes

Extraction of Soil Solution into a Microfluidic Chip

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