Authors: Robert E. Bailey; Joseph B. Strausburg; Shuming Nie

Source: Journal of Nanoscience and Nanotechnology, Volume 4, Number 6, July 2004 , pp. 569-574(6)

Publisher: American Scientific Publishers

Abstract:

Ternary cadmium selenium telluride quantum dots (CdSe_1-xTe_x, x = mole fraction of tellurium) have been prepared for potential use as constant-size biolabels with tunable fluorescence emission in the far-red and near-infrared (650-850 nm) spectral range. In contrast to particle size tuning reported for binary dots, we show that molar composition can be used to tune the optical and electronic properties of alloyed semiconductor nanocrystals without changing the particle size. A surprising finding is a nonlinear relationship between the composition and the absorption/emission energies, leading to new properties not obtainable from the parent CdSe and CdTe binary systems. Coating the alloy cores with a higher band-gap material such as CdS improves the fluorescence efficiencies to about 40-60% at room temperature and allows the preparation of water-soluble and biocompatible alloyed dots at similar quantum yields. A cadmium-rich surface is found to improve mercapto ligand binding and the long-term stability of water-soluble dots.

Keywords: SEMICONDUCTOR QUANTUM DOTS; BIOLOGICAL LABELS; NEAR-INFRARED; CDSE AND CDTE BINARY SYSTEMS

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2004.004

Publication date: 2004-07-01

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