Monolithic light emitting device and light detecting device fabricated with a commercial LED wafer
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Monolithic light emitting device and light detecting device fabricated with a commercial LED wafer Chen Yue1,2,3 · Lu Wang1,3 · Jinlei Lu1,2,3 · Xiansheng Tang1,2,3 · Wenxin Wang1,3,4 · Hong Chen1,3,4 · Haiqiang Jia1,3,4 Received: 14 March 2020 / Accepted: 10 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Lower cost and smaller volume are imperious demands for active optical measuring and imaging systems. Different from the traditional methods using separate light emitting devices and light detecting devices, a novel way is provided to acquire a simple active optical detecting system. It is found that a commercial light emitting diode (LED) can work as a photodetector utilizing the fact that localized photogenerated carriers within an appropriate p–n junction escape efficiently. Furthermore, a prototype of a simple active optical detecting system is fabricated with a commercial LED wafer on which a light emitting device and a light detecting device are integrated monolithically. It is measured out a good ability in detection for a target with a smooth or rough surface. These results exhibit a considerable possibility of a cheap, flexible and small simple active optical detecting system. Keywords Photodetector · Monolithic device · Optical sensor
1 Introduction In recent years, active optical measuring and imaging systems are widely needed in many application scenarios (Blais 2004; Oggier et al. 2004), such as the laser scanning vibrometer, the light detection and ranging (LIDAR) (Molebny et al. 2017; Albota et al. 2002), 3D sensors (Kang et al. 2019; Sgrott et al. 2010), the proximity sensor (Masuda 1986; Chen et al. 2008), the optical module, etc. In such systems, light emitting devices and detecting device are building blocks in all above mentioned applications. A convenient method to integrate those two kinds of devices is not only important to increase the size, weight and * Lu Wang [email protected] 1
Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
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University of Chinese Academy of Sciences, Beijing 100049, China
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Center of Materials and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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Songshan Lake Materials Laboratory, Dongguan 523808, Guangdong, China
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power performance in these applications but also possible to help put other long desired systems into real use, such as photonic integrated circuits (Taubenblatt 2012; Lotfi et al. 2016). For a long time, light emitting diodes (LEDs) and photodetectors have been thought as two totally different devices in structure, function and work principles. The common method to fabricate a self-light-emitting detecting system combining LEDs and photodiodes is packaging two separate devices into one module. One needs to prepare tw
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