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Optical Properties of CdSe Nanoparticle Assemblies

  • F. Rafael Leon (a1) (a2), Natalia Zaitseva (a1), Daniele Gerion (a1), Thomas Huser (a1) and Denise Krol (a1) (a2)...

Abstract

We report on three-dimensional fluorescence imaging of micron-size faceted crystals precipitated from solutions of CdSe nanocrystals. Such crystals have previously been suggested to be superlattices of CdSe quantum dots [1,2]. Possible applications for these materials include their use in optical and optoelectronic devices. The micron-size crystals were grown by slow evaporation from toluene solutions of CdSe nanocrystals in the range of 3–6 nm, produced by traditional wet-chemistry techniques. By using a confocal microscope with laser illumination, three-dimensional raster-scanning and synchronized hyper-spectral detection, we have generated spatial profiles of the fluorescence emission intensity and spectrum. The fluorescence data of the micro-crystals were compared with spectra of individual nanocrystals obtained from the same solution. The results do not support the assertion that these microcrystals consist of CdSe superlattices.

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References

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2. Rogach, A. L., Talapin, D. V., Shevchenko, E. V., Kornowski, A., Haase, M., Weller, H., Adv. Func. Mat., 12 (10), 653664 (2002).
3. Qu, L. and Peng, X., J. Am. Chem. Soc., 124 (9), 20492055 (2002).
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5. Michalet, X., Pinaud, F., Lacoste, T. D., Dahan, M., Bruchez, M. P., Alivisatos, A. P., Weiss, S., Single Molecules, 2 (4), 261276 (2001).

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