Long Decays of Excitonic Photoluminescence from CdTe/ZnTe Individual Quantum Dots |
| B. Piecha, J. Suffczyński, A. Trajnerowicz, M. Goryca, P. Kossacki, A. Golnik and J.A. Gaj
Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland |
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| Received: 4 06 2005; |
| We present time-resolved micro-photoluminescence study of self-assembled CdTe/ZnTe quantum dots. In addition to the fast radiative decay of the exciton, we observe long components, being of the order of a few nanoseconds. We observe that long decays are present for neutral exciton lines as well as on the biexciton ones. The temperature dependent measurements reveal the non-monotonic behaviour. We find also that the long decays are not mono-exponential. We conclude that the dark exciton states cannot be treated as the only source of long decays in the luminescence. We propose other possible explanation, which is the slowing of luminescence by carrier trapping in high energy states in quantum dots and barriers. |
| DOI: 10.12693/APhysPolA.108.831 PACS numbers:78.47.+p, 78.67.Hc, 78.55.Et |