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Frequency up-conversion of few low-energy photons into a single high-energyphoton, greatly contributes to imaging, light sources, detection and otherfields of research. However, it offers negligible efficiency when up-convertingmany photons. This is because coherent process are fundamentally limited due tomomentum conservation requirements, while in incoherent up-conversion thefinite intermediate states lifetime requires huge intensities.Thermodynamically, conventional incoherent up-conversion is driven by theinternal energy of the incoming photons. However, a system can also drive workthrough change in its collective properties such as entropy. Here weexperimentally demonstrate entropy driven ten-fold up-conversion from 10.6{\mu}to 1{\mu}m at internal efficiency above 27% and total efficiency above 10%. Inaddition, the emitted radiance at 1{\mu}m exceeds the maximal possibleBlack-Body radiance of our device, indicating emitter's effective-temperaturethat is considerably above the bulk-temperature. This work opens the way forup-conversion of thermal-radiation, and high-temperature chemistry done atroom-temperature.

Entropy driven multi-photon frequency up-conversion