Strem Chemicals offers StremDots™ Series A Plus fluorescent semiconductor nanocrystals (Figure 1) in three different emission colors: red, orange and green. Leveraging the Center for Applied Nanotechnology’s (CAN) expertise in nanoparticle synthesis, the morphological features of these nanocrystals have been improved to obtain advanced optoelectronic properties. With an extremely high extinction coefficient and an enhanced quantum efficiency, they have a brightness ten folds higher than that of normal quantum dots.
Figure 1. StremDots™ Series A Plus fluorescent semiconductor nanocrystals
Advantages of StremDots™ Series A Plus Fluorescent Semiconductor Nanocrystals
StremDots™ Series A Plus fluorescent semiconductor nanocrystals demonstrate higher photo- and thermostability, thanks to their unique shape. Besides these advantages, these materials exhibit superior processability owing to efficient shielding via an outer organic shell. The processability of polymeric compounds, including StremDots™ Series A Plus, is illustrated in Figure 2.
Figure 2. Polymeric compounds including StremDots™ Series A Plus showing their processability (left: without excitation, right: with excitation
With these qualities, the StremDots™ Series A Plus rods have become the suitable material for use in many different material and life science applications, such as lasers, solid state lighting (LED) and challenging fluorescence imaging tools. The absorption and emission spectrum of StremDots™ Series A Plus rods is depicted in Figure 3.
Figure 3. Absorption and emission spectrum of StremDots™ Series A Plus (590nm emission)
Figure 4. TEM image of elongated core/shell particles
TEM image of elongated core/shell particles is shown Figure 4. The following table provides the features and advantages of StremDots™ Series A Plus materials.
| Features |
Advantages |
| Material |
CdSe/CdS core/shell nanoparticles |
Elongated structure |
high photo- and thermostability |
| Solubility |
nonpolar organic solvents |
Efficiently shielded core |
quantum yield above 60% |
| Excitation |
wavelengths from UV to VIS possible |
Higher extinction coefficient |
increased brightness compared to dots |
| Emission |
maximum 560, 590 and 620 nm (2.2, 2.1 and 2.0 eV) |
Stabilizing organic ligand shell |
enhanced processability |
| FWHM |
typically < 35 nm |
Monodispersity of StremDots™ |
narrow fluorescence band |
The concentration of the StremDots™ Series A Plus rods is 5mg/mL, and their diameter and length are in the range of 3-5nm and 15-20nm, respectively. These rods are stable for more than 12 months and need to be stored at 2-8°C in dark under inert atmosphere without freezing. StremDots™ Series A Plus rods can be customized further to deliver the optimum solution for fluorescence applications.
This information has been sourced, reviewed and adapted from materials provided by Strem Chemicals.
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