(a) HRTEM picture of individual CdS nanocrystal capped by oleic acid and (b) CdS aggregates capped by oleic acid, inset are the high-resolution phase of selected areas.
(a) The nanocluster aggregation in reverse micelle (arrow indicate the axis of crystal lattice); (b) the macroscopic exciton after photoexcitation of QD aggregates if their lattice axis are parallel.
(a) Exciton absorption of one CdS nanocrystal (4 nm) in reverse micelle. (b) Absorption spectrum of CdS nanocrystal aggregated solution.
(a) The photoluminescence and excitation spectra of individual CdS nanocrystal organosol. (b) The photoluminescence spectra at 355 nm excitation and excitation spectrum of aggregated CdS nanocrystal organosol at 393 nm emission, and the green curves are the fitted curves for the emission spectrum.
The excitation and emission spectra of CdS aggregates at excitation of 380 nm, fitting data, and the excitation spectra for 494 nm emission.
The upconversion photoluminescence spectra of CdS aggregates film. The excitation wavelength is about 476 nm.
(a) The excitation band structure-transition dipole array relation of bounded two nanocrystals; (b) the exciton absorption profiles of nanocrystal aggregates and individual nanocrystals.
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