Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 133, Issue 1, Pages 24-26Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja108482a
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Funding
- NIH [PN2EY018244, R01 CA108468, U54CA119338]
- Georgia Tech-Emory-PKU Coulter
- NCI [1K99CA154006-01]
- Emory-Georgia Tech Cancer Nanotechnology Center
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We report a new strategy based on mercury cation exchange in nonpolar solvents to prepare bright and compact alloyed quantum dots (QDs) (HgxCd1-xE, where E = Te, Se, or S) with equalized particle size and broadly tunable absorption and fluorescence emission in the near-infrared. The main rationale is that cubic CdE and HgE have nearly identical lattice constants but very different band gap energies and electron/hole masses. Thus, replacement of Cd2+ by Hg2+ in CdTe nanocrystals does not change the particle size, but it greatly alters the band gap energy. After capping with a multilayer shell and solubilization with a multidentate ligand, this class of cation-exchanged QDs are compact (6.5 nm nanocrystal size and 10 nm hydrodynamic diameter) and very bright (60-80% quantum yield), with narrow and symmetric fluorescence spectra tunable across the wavelength range from 700 to 1150 nm.
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