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The importance of sensors to determine chemical, biochemical and metabolic parameters increases steadily in different fields of applications. Fast and reliable sensors are demanded e.g. for process control in industry, foodand biotechnology, patient monitoring, diagnostics, or environmental monitoring. Key performance parameters of such devices are sensitivity, selectivity and response time. Many optical chemosensors rely on the detection of luminescence signals which depend on the concentration of a certain chemical species (e.g. O2, CO2, pH, ...). Luminescence detection is often preferred over other optical detection schemes (e.g. absorption) due to its superior sensitivity and selectivity [1]. Generally the concentration dependent luminescence properties of a sensor film in contact with the sample medium are detected by an optical system (Figure 1). Such optoelectronic readout systems consist of: a light source (e.g. light emitting diode, LED) for excitation of the dye, a photodetector for the detection of the emitted luminescence, some optical components like filters for separation of excitation and emission light, and a signal processing electronics [2]. A few examples of optoelectronic readout devices for oxygen sensors, designed for different applications in chemical process control and food packaging, are shown in Figure 2. The sensitive films are basically composites of multiple polymer layers (see Figure 1b). For the carrier substrates usually transparent polymer films (e.g. PET) are chosen although in some applications glass can also be used. The luminescent sensing layer itself consists of a polymeric matrix material doped with a luminescent indicator dye. The sensitivity of the sensor as well as the selectivity for a certain analyte are mainly determined by the properties of these two materials. The chemical nature of the dye determines how its luminescence properties change upon interaction with the analyte (quenching, protonation/deprononation, electron transfer, ...). The polymeric matrix material is responsible for controlling the permeability for the analyte, interfering sample components and possible analyte enrichment. Depending on the desired analyte, measurement range and application field, the sensitive layer may also contain further components in order to modify the sensors selectivity, response characteristic, or other properties (e.g. phase transfer agents, plasticizers, ionophors).

C7.3 - From Optochemical Sensors for Industrial Processes to Large-Area Printing of Sensor Systems Integrated with Organic Electronics