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bilateral switching an led between light out and light in using energy harvester

Other Parts Discussed in Thread: TPS3839, BQ25504

Since an LED can function as a weak solar cell (generating current) is it possible for an LED to power an energy harvester (e.g. BQ25504) and also, using a suitable H-bridge of bilateral (analog) mosfet switches (with the LED in the horizontal of the H), power the LED (in light-emitting mode) from the stored charge output of the energy harvester (time multiplexed using a voltage monitor e.g. a TPS3839) ???

I am not an electrical engineer.  I am asking:

- is there a flaw in the idea?

- is there a reference to such a circuit?

Since most LED data sheets don't describe their current generating capacity, it depends on finding an LED with sufficient generated current to meet the specs of the energy harvester (minimum of about 20uA.)  I might be falsely assuming that since LED's are increasingly efficient light generators, newer LED's might also be more efficient as current generators.