Couldn't such LEDs be used as incredibly efficient heat sinks? I presume that once it's possible to deploy those LEDs on large scale they should be much more ef

Couldn't such LEDs be used as incredibly efficient heat sinks? I presume that once it's possible to deploy those LEDs on large scale they should be much more efficient than traditional cooling devices. Moreover, they might be used for energy extraction. The heat extracted from the surroundings is converted into light, which in turn could be converted into electricity.