Can we capture the radiation into electrical energy

We all know that energy can never be created nor   distroyed  from one form to but it can
We all know that sun's radiation are captured and transform into electrical energy by solar panel or photovoltaic materials .
But we can capture the radiation that is emitted by mobile in very small amount   we can say when we talking about the electrical energy.  And stored that radiation   with the help of some other radio active materials we can increase the efficiency of that rays or radiation .the  frequency of the radiated rays  is not equal to the frequency to  the light 

be changed one form to  another form its basic theory of thermodynamic