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In plane optical sensor based on organic electronic devices

Author: Koetse, M.M · Rensing, P.A. · Heck, G.T. van · Sharpe, R.B.A. · Allard, B.A.M. · Wieringa, F.P. · Kruijt, P.G.M. · Meulendijks, N.M.M. · Jansen, H. · Schoo, H.F.M.
Type:article
Date:2008
Institution: TNO Industrie en Techniek
Source:Organic Field-Effect Transistors VII and Organic Semiconductors in Sensors and Bioelectronics, 10-12 August 2008, San Diego, CA, USA, 7054
series:
Proceedings of SPIE - The International Society for Optical Engineering
Identifier: 241117
ISBN: 9780819472748
Article number: No.: 70541I
Keywords: OLED · Organic photodiodes · Photoplethysmography · Smart bandage · Systems in foil · Crystals · Data processing · Electric conductivity · Field effect transistors · Helmet mounted displays · Light emitting diodes · Modulation · Optical sensors · Photodiodes · Physiological models · Semiconducting organic compounds · Semiconductor materials · Sensors · Signal processing · Telecommunication equipment · Thermoelectric equipment · Transistors · Organic light emitting diodes (OLED)

Abstract

Sensors based on organic electronic devices are emerging in a wide range of application areas. Here we present a sensor platform using organic light emitting diodes (OLED) and organic photodiodes (OPD) as active components. By means of lamination and interconnection technology the functional foils with OLED and OPD arrays form an in-plane optical sensor platform (IPOS). This platform can be extended with a wireless data and signal processing unit yielding a sensor node. The focus of our research is to engage the node in a healthcare application, in which a bandage is able to monitor the vital signs of a person, a so-called Smart Bandage. One of the principles that is described here is based on measuring the absorption modulation of blood volume induced by the pulse (photoplethysmography). The information from such a bandage could be used to monitor wound healing by measuring the perfusion in the skin. The OLED and OPD devices are manufactured on separate foils and glass substrates by means of printing and coating technologies. Furthermore, the modular approach allows for the application of the optical sensing unit in a variety of other fields including chemical sensing. This, ultimately enables the measurement of a large variety of physiological parameters using the same bandage and the same basic sensor architecture. Here we discuss the build-up of our device in general terms. Specific characteristics of the used OLEDs and OPDs are shown and finally we demonstrate the functionality by simultaneously recorded photoplethysmograms of our device and a clinical pulseoximeter.