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Tetrahedral [Zn4O(OAc)6]-clusters grow in alcohol in the presence of ErIII and SiIV ions to self-similar tetrahedral ZnO nanocrystals (with sizes d=5–6 nm). The nanoparticulate ZnO films prepared from these colloids show green ErIII fluorescence. The Klafter–Blumen theory is used to fit the fluorescence decay data. From this fit, the donor life time τD and the exponent β were determined to be τD=4.3 μs and β=0.289, indicating that the interior space of the codoped ZnO nanocrystallites is fractal.
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Kohls et al. (2002) studied this question.
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