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Photoluminescence Spectroscopy of Quantum Dots, monitored by the Spex FluoroMax

of these ions; and (c) the binary structures of these ions have various lattice constants. Relaxation of the ionic bonds to equilibrium positions may lead to local order in the structure and a larger than expected reduction in the band-gap.


Conclusions
Particle size and composition can control quantum confinement. These QDs may be useful for molecular imaging in living systems, because of their near-IR and far-red fluorescence, where deep-tissue imaging is necessary, away from blood and water light-absorption QDs also provide absorption coefficients an order-of-magnitude larger than typical organic dyes. The ultra-sensitive Spex FluoroMax spectrofluorometer is useful in a wide array of research related to nanostructures and materials science for the future.


Acknowledgements
Data and images from Robert Bailey at Oxford University, and Shuming Nie at Emory University and Georgia Institute of Technology are gratefully acknowledged.


Reference
1. R. E. Bailey and S. Nie, Journal of the American Chemical Society 125, 7100-7106 (2003).

2. Y. Tian, T. Newton, N. A. Kotov, D. M. Guldi, and J. H. Fendler, Journal of Physical Chemistry, 100, 8927-8939 (1996).

3. R. K. Richardson and H/ L/ Goering, Eds., Compound Semiconductors (Reinhold, New York, 1962).

4. L. Z. Vegard, Zeitschrift fr Physik 5, 17-26 (1921).

5. H. C. Poon, Z. C. Feng, Y. P. Feng, and M. F. Li, Journal of Physics: Condensed Matter 7, 2783-2799 (1995).

6. J.
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