Abstract
Secondary emission spectra from the excited states of exciton series in black monoclinic ZnP 2 single crystal are measured at 6K under the band-to-band excitation condition. The luminescence bands due to the radiative recombination of the 2 s , 3 s and 4 s excitons are clearly observed separately. The changes in intensities of the 1LO Raman line with the energy of 32.2 meV and the luminescence bands with the excitation energy are studied in detail. The 1LO Raman line shows resonance enhancement due to the out-going resonant effect when it comes near the 2 s exciton band. On the contrary, when it is just superimposed on the 3 s luminescence peak the intensities of the 2 s and 3 s luminescence bands and the 1LO Raman line have the minimum values. This weakness is explained with the relaxation of the exciton polariton through the 2LO Raman process.
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