Organic Soluble CdSe/ZnS Quantum Dots
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Product Description
Quantum dots are semiconductor nanoparticles with size-dependent optical and electronic properties. They range in size from 4 to 10 nm and are bright fluorescent emitters. Alfa Chemistry offers organic soluble quantum dots with high quantum yields, narrow photoemission spectra and long shelf life. They are soluble in most organic solvents, making them ideal for monolayer preparation. Organic soluble CdSe/ZnS quantum dots are ideal candidates for applications such as solid-state light-emitting devices (LEDs), solar cells, photovoltaic devices, and light-emitting solar concentrators (LSCs). The oil-soluble core-shell CdSe/ZnS quantum dots are encapsulated with hydrophobic ligands and are soluble in organic solvents such as toluene, hexane, and chloroform. These nanoparticles can emit into the blue, green, yellow, orange, red, and near-infrared regions of the electromagnetic spectrum.
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Optical Components
Mohan et al. used CdSe/ZnS quantum dots (QDs) dispersed in polymethyl methacrylate (PMMA) to fabricate highly fluorescent yellow-emitting nanophosphors. The quantum dots were synthesized by a simple non-phosphine and one-pot method in the absence of an inert atmosphere. The prepared nanocrystals were characterized by Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible (UV-vis) and photoluminescence spectroscopy, energy dispersive spectroscopy (EDS), Raman spectroscopy and transmission electron microscopy (TEM). Optical analysis confirmed the high quality of the synthesized CdSe/ZnS quantum dots with sharp absorption peaks, bright luminescence, narrow emission widths and high PL quantum yields (up to 74%). Electron microscopy images show small and spherical quantum dots with narrow size distribution, while HRTEM micrographs confirm the high crystallinity of the material. Raman analysis of the quantum dots reveals the formation of the core-shell structure and energy dispersive spectroscopy confirms the presence of the corresponding elements (i.e., Cd, Se, Zn, and S). dispersion of the core-shell QD in the PMMA matrix leads to a red shift of the emission position from 393 nm in pure PMMA to 592 nm in the nanocomposite.
Fig. 1. Schematic representation for the preparation of CdSe/ZnS core-shell QDs. (Mohan et al, 2015)
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References
- Mohan, S. , et al. Green synthesis of yellow emitting PMMA–CdSe/ZnS quantum dots nanophosphors. Materials Science in Semiconductor Processing, 2015, 39:587-595.
- Skaff, H. , et al. Crosslinked Capsules of Quantum Dots by Interfacial Assembly and Ligand Crosslinking. Advanced Materials (2005).
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