Abstract
Short‐wavelength infrared (SWIR) photodetection and visualization has profound impacts on different applications. In this work, a large‐area organic SWIR photodetector (PD) that is sensitive to SWIR light over a wavelength range from 1000 to 1600 nm and a SWIR visualization device that is capable of upconverting SWIR to visible light are developed. The organic SWIR PD, comprising an organic SWIR sensitive blend of a near‐infrared polymer and a nonfullerene n‐type small molecule SWIR dye, demonstrates an excellent capability for real‐time heart rate monitoring, offering an attractive opportunity for portable and wearable healthcare gadgets. The SWIR‐to‐visible upconversion device is also demonstrated by monolithic integration of an organic SWIR PD and a perovskite light‐emitting diode, converting SWIR (1050 nm) to visible light (516 nm). The most important attribute of the SWIR visualizing device is its solution fabrication capability for large‐area SWIR detection and visualization at a low cost. The results are very encouraging, revealing the exciting large‐area SWIR photodetection and visualization for a plethora of applications in environmental pollution, surveillance, bioimaging, medical, automotive, food, and wellness monitoring.
Highlights
Introduction profound impacts on different applicationsIn this work, a large-area organic Short-wave infrared (SWIR) photodetector (PD) that is sensitive to SWIR light over a wavelength range from 1000 to 1600 nm and a SWIR visualization device that is capable of upconverting SWIR to visible light are developed
We report our effort to develop a solutionprocessable large-area organic SWIR PD that is sensitive to the invisible light over a wavelength range from 1000 to 1600 nm and a SWIR visualizing device that is capable of upconverting SWIR (1050 nm) to visible light (516 nm)
The organic SWIR sensitive bulk heterojunction (BHJ), comprising a DPP-DTT polymer donor and an n-type hetero-polycyclic aromatic compound SWIR dye, has a pronounced absorption extended to the SWIR region
Summary
The organic SWIR sensitive BHJ, comprising a DPP-DTT polymer donor and an n-type hetero-polycyclic aromatic compound SWIR dye, has a pronounced absorption extended to the SWIR region. Taking advantage of the high carrier mobility of the DPPDTT polymer and the excellent absorption of the DPP-DTT:SWIR dye blend layer over the long wavelength range from 1000 to 1600 nm, the suitability of the DPP-DTT:SWIR dye BHJ for application in organic SWIR PTs has been attempted. The organic SWIR PD, with an encouraging photoresponse extending to 1600 nm, as demonstrated in this work, provides an opportunity for application in portable and wearable PPG sensory gadgets
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