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The influence of a distributed Bragg reflector composed of ZnTe, MgTe, andMgSe superlattices on photoluminescence of self assembled CdTe quantum dots(QD) emitting in the yellow spectral range is investigated. In the case of QDsgrown on a distributed Bragg reflector the photoluminescence intensity isenhanced by more than one order of magnitude, whereas the single QD lines arebroadened as compared to the case of QDs grown on a ZnTe buffer. Structural andchemical analysis reveal an unintentional formation of a thin ZnSe layerinduced by the growth interruption needed for the deposition of the QDs sheet.Sharp emission lines from individual quantum dots are recovered in the case ofa thicker ZnTe layer grown prior to the QDs. This indicates that growthinterruptions might be responsible for the QD emission line broadening.

Influence of ZnTe based distributed Bragg reflectors on the yellow range luminescence of self assembled CdTe QDs