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Recent reports of upconversion and white light emission from graphiticparticles warrant an explanation of the physics behind the process. We offer amodel, wherein the upconversion is facilitated by photo-induced electronicstructure modification allowing for multi-photon processes. As per theprediction of the model, we experimentally show that graphite upconvertsinfrared light centered around 1.31~$\mu$m to broadband white light centeredaround 0.85 $\mu$m. Our results suggest that upconversion from shortwaveinfrared ($\sim$3~$\mu$m) to visible region may be possible. Our experimentsshow that the population dynamics of the electronic states involved in thisupconversion process occur in the timescale of milliseconds.

Upconversion of infrared light by graphitic micro-particles due to photo-induced structural modification