Abstract
Time-integrated and time-resolved photoluminescence of Cd0.3Zn0.7S0.06Se0.94/ ZnS0.06Se0.94single quantum wells (QW) have been studied. The radiative recombination process is dominated by localized excitons which have a constant lifetime of ∼ 300 ps when the temperature is less than 130 K. As the temperature increases, localized excitons are thermally activated to form free excitons which are stable up to room temperature because of the large exciton binding energy and strong confinement of electrons and holes in these QWs. Free exciton radiative recombination is thus dominated when temperature is in the 130 K to room temperature (295 K) range. The free exciton decay time of ∼ 300 ps at 130 K increased linearly to ∼ 1ns at 295 K. This linear increase in exciton lifetime with temperature agrees with the theoretical prediction by considering the conservation of momentum requirement for radiative recombination for excitons in QW.
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