Properties of the Excitonic Emission at Room Temperature in Cd_<0.3>Zn_<0.7>S/ZnS Strained-Layer Superlattices

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Cd_<0.3>Zn_<0.7>S/ZnS multiple-quantum-well straind-layer superlattices with a range of well widths can produce excitonic emission around 3.4 eV at room temperature (RT), due to the quantum confinement of excitons in the CdZnS wells. The emission spectra a 41 Å Cd_<0.3>Zn_<0.7>S/ZnS well were extensively studied under high optical excitation. We found a nonlinear dependence of the spontaneous RT exciton-emission intensity on the excitation intensity for high excitations. With increasing excitation density, the emission line moves to slightly the lower-photon energy addition its linewidth is broadedned. A shoulder on higher-energy side of the excitonic spetrum appears above about 100 kW/cm^2, which is related to an optical transition assoiated with a higher excited-level state of the electrons confied in the conduction-band potential well.
社団法人応用物理学会の論文
1991-06-01