Compared to traditional
near-infrared (NIR) imaging devices, NIR-to-visible
upconversion displays, which integrated a NIR photodetector with a
visible light-emitting diode, have merits of simple device structure,
low cost, high resolution, and a simple pixelless structure. However,
photon-to-photon upconversion efficiencies of these devices are typically
much lower than unity. Here we report an all-organic NIR-to-visible
upconversion display with a photon-to-photon upconversion efficiency
higher than 100% by integrating a photomultiplying organic NIR photodetector
with a high-efficiency thermally activated delayed fluorescent organic
light-emitting diode. To the best of our knowledge, this is the first
report showing a photon-to-photon upconversion efficiency over 100%
without using a built-in transistor for current amplification.
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