StremDots™ Series A Plus CdSe/CdS Quantum Rods

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.

CANdots Series A Plus fluorescent semiconductor nanocrystals

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.

Polymeric compounds including CANdots® Series A Plus showing their processability (left: without excitation, right: with excitation

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.

Absorption and emission spectrum of CANdots® Series A Plus (590nm emission)

Figure 3. Absorption and emission spectrum of StremDots™ Series A Plus (590nm emission)

TEM image of elongated core/shell particles

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.

For more information on this source, please visit Strem Chemicals.

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