28 April 2008 Novel integrated organic sensor system for the detection of oxygen and pH
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Abstract
A compact, integrated photoluminescence based oxygen and pH sensor, utilizing an organic light emitting device (OLED) as the light source and an organic photodiode (OPD) as the detection unit, is described. The main challenge in such an integrated sensor is the suppression of the excitation light at the detector, which is typically by many orders of magnitude higher in intensity than the emitted fluorescence. In our approach we refrain from utilizing edge filters which require narrowband excitation sources and dyes with an adequate large stoke shift. We developed an integrated sensor concept relying on two polarizers to separate the emission and excitation light. One polarizer is located right after the OLED, while the other one, oriented at 90° to the first, is placed in front of the OPD. The main advantage of this solution is that any combination of excitation and emission light is acceptable, even if the two signals overlap spectrally. This is especially important for the use of OLEDs as the excitation sources, as these devices typically exhibit a broad spectral emission.
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Elke Kraker, Elke Kraker, Anja Haase, Anja Haase, Bernhard Lamprecht, Bernhard Lamprecht, Georg Jakopic, Georg Jakopic, J. Krenn, J. Krenn, Christian Konrad, Christian Konrad, Stefan Köstler, Stefan Köstler, } "Novel integrated organic sensor system for the detection of oxygen and pH", Proc. SPIE 7003, Optical Sensors 2008, 70031D (28 April 2008); doi: 10.1117/12.780938; https://doi.org/10.1117/12.780938
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