Abstract
Integration of organic light emitting diodes (OLEDs) and organic photodetectors (OPDs) on flexible plastic substrates promises compact and low-cost optical detection units for multiplex sensors. These units may be laminated to a microfluidic system for sensing applications in a liquid. Here, a $6\times 6$ element matrix of alternating blue OLEDs and OPDs is demonstrated on a single flexible plastic substrate. The devices are fabricated by masked thermal evaporation on a $200~\mu \text{m}$ thick polyethylene terephthalate (PET) foil. The individual device size is 1 mm $\times 1$ mm. Both OLEDs and OPDs are demonstrated to work. The spectral characteristics are shown to be suitable for fluorescence measurements. Signals from fluorescence-labeled spots above the OPDs under OLED excitation are investigated. Successful operation of the OLED-OPD matrix for reflection measurement is demonstrated.
Highlights
F LEXIBLE and on-skin wearable sensors are highly promising for continuous health monitoring [1]
Lochner et al proposed the realization of a pulse oximeter based on two types of organic light emitting diodes (OLEDs) and organic photodetectors (OPDs) on a single flexible substrate for a wearable oxygen sensor [2]
Liu et al discussed different configurations of all-organic sensors for simultaneous oxygen and pH monitoring; OLEDs integrated with sensing films on rigid substrates and OPDs on separate substrates [4]
Summary
F LEXIBLE and on-skin wearable sensors are highly promising for continuous health monitoring [1]. Lochner et al proposed the realization of a pulse oximeter based on two types of OLEDs and OPDs on a single flexible substrate for a wearable oxygen sensor [2]. They demonstrated the device concept with OLEDs fabricated on separate rigid substrates. In the hybrid integration approach the PDMS microfluidic is assumed to be placed on the opposite side of the PET foil from the active organic optoelectronics This ensures that a controlled optical path is achieved and no damage to the devices due to the liquid is expected. We choose this alignment to achieve the highest fluorescence intensity
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