Radiative cooling under the conditions of magnetoconcentration

The results of theoretical and experimental studies of the time dependences of radiative cooling produced by a pulsed semiconductor source of negative interband luminescence are presented. The kinetics of cooling and subsequent temperature relaxation of the passive element, which depend on the power and duration of the luminescence pulse, are studied. It is shown that the luminescence excitation method employed (the magnetoconcentration effect) makes possible both radiative cooling and heating of the passive element; this is promising for practical applications. The results of a theoretical study are in qualitative agreement with the experimental data. The maximum cooling achieved in the experiment at room temperature is 0.62 K.