Exciton Luminescence and Photoconductivity of CdS Under High Intensity Excitation
Luminescence and photoconductivity of CdS under high intensity excitation are studied at 1.8 K using a nitrogen laser and a nitrogen laser-pumped tunahle dye laser, in order to investigate the dynamical behavior of high density excitons and excitonic molecules.
Three new luminescence lines, M, PM and P, are reported. They are assigned to the radiative annihilation of an excitonic molecule, to the inelastic collision of excitonic molecules and to the inelastic collision of single excitons, respectively. The spectral shapes of the M and PM lines are analyzed theoretically. Photoconductivity measurement shows that the magnitude of the photocurrent under exciton excitation tends to become nearly the same as that under band gap excitation with increasing excitation power.
KeywordsInelastic Collision Line Luminescence Triplet Exciton Radiative Annihilation High Energy Side
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