Laser Emission in CdSe Due to Exciton—Exciton and Exciton—Electron Interaction

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Abstract
Spectra of the spontaneous and stimulated emission of CdSe are presented in the temperature range from liquid helium to room temperature under electron beam excitation. At temperatures below 70 K the laser process results from the exciton—exciton interaction and from the annihilation of a free exciton associated with the emission of one longitudinal optical phonon. At temperatures above 90 K the laser emission is found to shift to lower energies much stronger than the bandgap. This shift can quantitatively be accounted for by the exciton—electron interaction process.