We study the lasing mechanism in Zn1-xCdxSe/ZnSe quantum well structures as a function of the Cd content by magnetoluminescence and absorption spectroscopy. The energy shift of the emission lines has been measured in magnetic field up to 8 T. In quantum wells with x=0.13 lasing seems to be due to free-carrier recombination, while for x=0.26 the stimulated emission is exciton-like. We also determine the threshold for the exciton bleaching by free carriers by measuring absorption in modulation doped quantum wells.
EXCITON SCREENING AND LASER PROCESSES IN Zn1-xCdxSe/ZnSe QUANTUM WELL STRUCTURES
M Lomascolo;P Prete;
1995
Abstract
We study the lasing mechanism in Zn1-xCdxSe/ZnSe quantum well structures as a function of the Cd content by magnetoluminescence and absorption spectroscopy. The energy shift of the emission lines has been measured in magnetic field up to 8 T. In quantum wells with x=0.13 lasing seems to be due to free-carrier recombination, while for x=0.26 the stimulated emission is exciton-like. We also determine the threshold for the exciton bleaching by free carriers by measuring absorption in modulation doped quantum wells.File in questo prodotto:
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