Abstract
Quaternary Znx′Cdy′Mg1−x′−y′Se/ZnxCdyMg1−x−ySe quantum well (QW) structures in which both the well and the barrier layers are composed of quaternary alloys lattice matched to InP and having various well thicknesses have been grown and investigated. A blue emission with narrow linewidth was achieved by using a relatively thick well thickness (40–60 Å). The quaternary QW emission exhibits excitonic recombination behavior and it has higher quantum efficiency than the ternary ZnxCd1−xSe/ZnxCdyMg1−x−ySe QW of comparable thickness. The temperature dependence of the photoluminescence measurements shows a high activation energy of 68 meV, indicating a strong quantum confinement by introduction of Mg in the QW region.
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