2-PHOTON SPECTROSCOPY AND MICROSCOPY OF II-VI SEMICONDUCTOR NANOCRYSTALS

We review our recent nonlinear spectroscopies of nanocrystals and synt hetic efforts to improve their luminescence properties. A two-photon s pectroscopic study of CdSe nanocrystals as a function of size is prese nted and compared with predictions from the effective mass model with spherical confinement. We also detail our efforts at improving the lum inescence properties of nanocrystals which have culminated in a 50% fl uorescence quantum yield for inorganic capping of some sizes of CdSe n anocrystals. Finally, we: present the application of two-photon micros copy to resolve fluorescence from single nanocrystals at room temperat ure and cryogenic temperatures.