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Sensing: Transparent Organic Upconversion Devices for Near‐Infrared Sensing (Adv. Mater. 7/2015)

On page 1217, S.-W. Liu, C.-C. Lee and co-workers present transparent organic upconversion devices for biotechnology and night-vision applications. The top-right circle presents an image seen by naked eye, while the bottom-left circle presents the image captured by the proposed upconverter. The proposed highresolution upconverter is capable of identifying blood vessels and observing objects in a dark environment.