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Solution-Processed Efficient Organic Upconversion Device for Direct NIR Imaging
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DOI：10.1002/adom.202400912.png)
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Abstract
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Infrared upconversion devices (UCDs) enable NIR imaging without array and readout circuits, making them desirable for portable sensor, imaging and monitoring. However, the exorbitant cost and difficulties in fabrication associated with vacuum-deposited materials, which are usually employed in high-performance UCDs, restrict their application in flexible-stretchable systems. Here, a solution-processed upconversion device (s-UCD), which is composed of detector and emitter, with high conversion efficiency and low turn-on voltage achieved by device structure design and interlayer engineering is reported. The role of the electron blocking layer is investigated in s-UCDs, and a peak luminance of 5,500 cd m-2 @7 V and a luminance on-off ratio of 110000 @5.25 V are achieved. The s-UCDs exhibit high resolution, microsecond response time and are compatible with flexible substrates. With the high-performance large-area s-UCDs, direct non-invasive transmission-based bioimaging applications with high quality of bioimaging are further performed. It is believed that the s-UCD imaging system offers potential applications for portable low-cost non-invasive tissue analysis, disease diagnosis, and virtual reality. Solution-processed upconversion devices (s-UCDs) are fabricated by interface engineering and device structural design, and have achieved the performance comparable to that of upconversion devices prepared by vapor deposition. The high-efficiency, high-refresh-rate, and high-resolution s-UCDs are applied in NIR visualization and non-invasive bio-imaging, and their adaptability in flexible systems is demonstrated. image
Keywords:
near-infrared photodetection
NIR visualization
non-invasive imaging
organic upconversion devices
solution-processed
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