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Copyright 2004 by Marcel Dekker, Inc. All Rights Reserved.

Copyright 2004 by Marcel Dekker, Inc. All Rights Reserved.

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Figure 3 (a) Spectral time trace of a single CdSe/ZnS QD at 10 K. The phononprogression (f25 meV) can be seen to the red of the strongest zero-phonon peak. Acomparison between spectral time traces for (b) 10 K and (c) room temperatureshows that spectral diffusion is present at both temperatures.In addition to the intensity data, spectral behavior similar to spectral diffusionwas emulated <strong>by</strong> use of external dc electric fields [13]. The same external fieldsprobed a changing, local electric dipole around each QD, indicating somechanging local electric field around the QD. Despite these studies, uncertaintyin the underlying physical mechanism remains.IV.CORRELATION BETWEEN SPECTRAL DIFFUSIONAND BLINKINGThe spectral information in Figs. 4a–4c clearly shows that for a single quantumdot under the perturbations of its environment, there are many possible<strong>Copyright</strong> <strong>2004</strong> <strong>by</strong> <strong>Marcel</strong> <strong>Dekker</strong>, <strong>Inc</strong>. <strong>All</strong> <strong>Rights</strong> <strong>Reserved</strong>.

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