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Using a single-band model, the lowest transition energy was analysed betweenthe lowest unoccupied molecular orbital (LUMO) of the conduction band and thehighest occupied molecular orbital (HOMO) of the valence band. We focus oncategorising the confinement strength in type-II core-shell quantum dots(CSQDs) based on the step-potential and show how it will affect theirtransition energy. Our model is applied to CSQDs of the heterostructuresPbS/CdS and ZnTe/ZnSe through narrow and wide band gaps, respectively. It foundthat PbS/CdS CSQDs demonstrates a strong confinement in which their transitionenergy would increase more compared to its weak confinement case in ZnTe/ZnSeCSQDs. The weak confinement case also demonstrated both blue-shift andred-shift of photoluminescence emission compared to the bulk ZnTe and ZnSe forwhich it can be inferred as pseudo type-II CSQDs. This would helpexperimentalists to tune the transition energy of type-II model in order tofabricate photons with longer carrier lifetime compared to the type-I model.

Confining type-II spherical core-shell quantum dot heterostructures with narrow and wide band gaps