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Proceedings Paper

Novel integrated organic sensor system for the detection of oxygen and pH
Author(s): Elke Kraker; Anja Haase; Bernhard Lamprecht; Georg Jakopic; J. Krenn; Christian Konrad; Stefan Köstler
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Paper 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.

Paper Details

Date Published: 28 April 2008
PDF: 13 pages
Proc. SPIE 7003, Optical Sensors 2008, 70031D (28 April 2008); doi: 10.1117/12.780938
Show Author Affiliations
Elke Kraker, Joanneum Research Forschungsgesellschaft mbH (Austria)
Anja Haase, Joanneum Research Forschungsgesellschaft mbH (Austria)
Bernhard Lamprecht, Joanneum Research Forschungsgesellschaft mbH (Austria)
Georg Jakopic, Joanneum Research Forschungsgesellschaft mbH (Austria)
J. Krenn, Joanneum Research Forschungsgesellschaft mbH (Austria)
Christian Konrad, Joanneum Research Forschungsgesellschaft mbH (Austria)
Stefan Köstler, Joanneum Research Forschungsgesellschaft mbH (Austria)

Published in SPIE Proceedings Vol. 7003:
Optical Sensors 2008
Francis Berghmans; Patrick P. Meyrueis; Thomas P. Pearsall; Anna Grazia Mignani; Antonello Cutolo, Editor(s)

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