Integrated tandem device with photoactive layer for near-infrared to visible upconversion imaging

An efficient organic near-infrared (NIR) to visible upconversion imaging device is obtained by integrating a photoactive buffer layer between two organic light-emitting diodes in a tandem configuration. As both types of photo-carriers (electrons and holes) are harvested to generate visible photons,...

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Bibliographic Details
Published in:Applied physics letters 2018-06, Vol.112 (24)
Main Authors: He, Shou-Jie, Wang, Deng-Ke, Yang, Zhen-Xin, Man, Jia-Xiu, Lu, Zheng-Hong
Format: Article
Language:English
Subjects:
Applied physics
Buffer layers
Infrared imaging
Light emitting diodes
Organic light emitting diodes
Photons
Tandem configuration
Upconversion
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Summary:An efficient organic near-infrared (NIR) to visible upconversion imaging device is obtained by integrating a photoactive buffer layer between two organic light-emitting diodes in a tandem configuration. As both types of photo-carriers (electrons and holes) are harvested to generate visible photons, this tandem device exhibits a significantly higher On/Off switching and has higher photon-photon conversion efficiency than conventional upconversion devices. We show that a high 5% photon-photon conversion rate is possible by optimizing the various functional layers in the tandem structure. We also demonstrate that a pixel-less NIR imaging chip can be made simply by using a large area single tandem organic upconversion device.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.5023430