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LED-based Energy Harvesting Systems for Modern Mobile Terminals

In visible light communication (VLC) systems, the receiver may incorporate an energy harvesting unit to charge the receiver’s battery or power a specific module in the device. This paper proposes a VLC system, which uses the incorporated light-emitting diode (LED) to harvest electrical energy. Most mobile terminals (MTs) utilize a power LED in their torch. During daylight or under a light-beam, MTs exploit this power LED, formerly used as a torch, to harvest energy. When needed, this LED is turned into a lighting point to light up a specific environment. A model of the LED energy harvested output power is given based on the Shockley diode equation. It is demonstrated, through measurements, that the quantity of energy harvested increases with the LED power.