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Synthesis and Characterization of Highly Luminescent (CdSe)ZnS Quantum Dots

  • F. V. Mikulec (a1), B. O. Dabbousi (a1), J. Rodriguez-Viejo (a2), J. R. Heine (a3), H. Mattoussi (a3), K. F. Jensen (a2) and M. G. Bawendi (a1)...

Abstract

We report the synthesis of a series of nearly monodisperse ZnS-overcoated CdSe quantum dots whose room temperature photoluminescence quantum yield approaches 50%. This spectrally narrow (FWHM < 40nm) band edge luminescence spans the visible region from blue to red light. We use a two-step synthesis based on the high temperature decomposition of organometallic precursors in a coordinating solvent. We characterize our composite quantum dots using optical spectroscopies, wavelength dispersive x-ray spectroscopy, x-ray photoelectron spectroscopy, high resolution transmission electron microscopy, small angle x-ray scattering, and wide angle x-ray diffraction. The data indicate that samples displaying the highest quantum yield are those which have just achieved a closed shell of ZnS encapsulating the CdSe core. As more ZnS is added, the quantum yield decreases somewhat, possibly due to the many defects present in larger ZnS shells.

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Synthesis and Characterization of Highly Luminescent (CdSe)ZnS Quantum Dots

  • F. V. Mikulec (a1), B. O. Dabbousi (a1), J. Rodriguez-Viejo (a2), J. R. Heine (a3), H. Mattoussi (a3), K. F. Jensen (a2) and M. G. Bawendi (a1)...

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