Problem is that emitted energy is very wasteful.
Say you're standing 10 metres away from the source when charging and you have an "energy catcher" of size 0.01m^2 (or 10cm by 10 cm, which is kinda big.) Energy is transmitted outwards as a sphere, the surface area being 4 x pi x r^2 at radius r. If your emitter sends out 4 x pi Watts, then, at distance r, the energy per square metre will be 1/r^2.
r = 10 => 1/100 W per square metre at 10m and then 0.01 x 1/100 for 1/10000 W transferred to phone per 4 x pi Watts emitted. Do 1 / (1 / 10000) to get 10000 lots of 4 x pi emitted Watts to get 1 Watt received at the source, resulting in 10 Watts received requiring ~1.2 MW per 10W (using 10W as a rough charging value.) That's less than 1% energy transferral.
Anyway, Tesla beat you to it with his wireless lights ages ago. Go look him up - he did crazy things!
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