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We present a detailed spectroscopic study of the photoluminescence quenchingin an epitaxial structures containing CdSe/ZnSe quantum dots doped with lowconcentration of Mn$^{2+}$ ions. Our time-resolved and time-integratedexperiments reveal the origin of the quenching observed inmacro-photoluminescence studies of ensembles of such dots. We show thatincorporation of even a few ions to an individual dot does not quench itsluminescence effectively, although some fingerprints of expected spin-dependentquenching are visible. At the same time, the presence of Mn$^{2+}$ ions in thesample significantly affects the luminescence intensity of the wetting layer,resulting in a quenching of the global luminescence from studied structure. Onthe other hand, the luminescence decay dynamics is found to be independent ofthe presence of Mn$^{2+}$ ions, which suggests that the observed quenchingoccurs for the excited excitonic states.

Origin of luminescence quenching in structures containing CdSe/ZnSe quantum dots with a few Mn$^{2+}$ ions