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.
Highlights
Organic electronic devices have been developing rapidly and significant progress has been made in organic light emitting diode (OLED) displays, white OLED lighting, organic transistors, organic photodetectors (OPDs), and organic solar cells [1,2,3,4,5]
We report our effort to develop a novel organic optical sensor that monolithically integrates a front OLED
The emission comes from the stripe-shaped OLED; it prevents the OLED emission from going directly to the OPD, maintaining a high signal-to-noise ratio
Summary
Organic electronic devices have been developing rapidly and significant progress has been made in organic light emitting diode (OLED) displays, white OLED lighting, organic transistors, organic photodetectors (OPDs), and organic solar cells [1,2,3,4,5]. Compared to those devices based on inorganic semiconductor materials, which still play a major role in the optoelectronic market, the emerging organic electronic devices offer additional advantages such as large area, flexibility, and solution-based fabrication processes at low costs. The design and fabrication flexibility provided by the material and process could readily construct multilayered organic optoelectronic systems for application in wearable units, finger print identification, image scanners, position scanners, smart light sources, and compact information systems
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