Energy efficiency of a diamond phonon luminescence relaxation
For the Stokes and anti-Stokes phonon luminescence of diamond, the equations are obtained in analytical form for calculating the impulse (time) characteristic and the total energy of losses. The calculation results are in good agreement with the experiment. A study of 30 samples of cut diamonds (diamonds) shows that the total luminescence energy varies from 0.9 to 1.5 eV. Smaller values of energy (0.9-1.1 eV) have anti-Stokes phonon luminescence. Additional energy losses at the stage of its excitation can be explained by the conversion of a part of the excitation photons into luminescence quanta with a higher frequency. Such an approach to the analysis of diamonds is possible only for natural samples and cannot be used for diamonds of artificial origin.