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Electronics 2015, 4(3), 623-632; doi:10.3390/electronics4030623

Organic Optical Sensor Based on Monolithic Integration of Organic Electronic Devices

Department of Physics, Institute of Advanced Materials, and Institute of Research and Continuing Education (Shenzhen), Hong Kong Baptist University, Kowloon Tong, NT, Hong Kong, China
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Author to whom correspondence should be addressed.
Academic Editors: Ruth Shinar and Emil J.W. List-Kratochvil
Received: 17 July 2015 / Revised: 5 September 2015 / Accepted: 10 September 2015 / Published: 17 September 2015
(This article belongs to the Special Issue Recent Advances in Organic Bioelectronics and Sensors)
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Abstract

A novel organic optical sensor that integrates a front organic light-emitting diode (OLED) and an organic photodiode (OPD) is demonstrated. The stripe-shaped cathode is used in the OLED components to create light signals, while the space between the stripe-shaped cathodes serves as the detection window for integrated OPD units. A MoO3 (5 nm)/Ag (15 nm) bi-layer inter-electrode is interposed between the vertically stacked OLED and OPD units, serving simultaneously as the cathode for the front OLED and an anode for the upper OPD units in the sensor. In the integrated sensor, the emission of the OLED units is confined by the area of the opaque stripe-shaped cathodes, optimized to maximize the reflected light passing through the window space for detection by the OPD components. This can ensure high OLED emission output, increasing the signal/noise ratio. The design and fabrication flexibility of an integrated OLED/OPD device also has low cost benefits, and is light weight and ultra-thin, making it possible for application in wearable units, finger print identification, image sensors, smart light sources, and compact information systems. View Full-Text
Keywords: organic sensor; organic light emitting diode; organic photodiode; integrated organic electronics organic sensor; organic light emitting diode; organic photodiode; integrated organic electronics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Tam, H.L.; Choi, W.H.; Zhu, F. Organic Optical Sensor Based on Monolithic Integration of Organic Electronic Devices. Electronics 2015, 4, 623-632.

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