StremDots™ – CdSe Core Quantum Dots with CdS, ZnSe and ZnS Shells

Strem Chemicals provides fluorescent quantum dots (Figure 1) in the following structures:

• Core – CdSe
• Core/Shell – CdSe/CdS
• Core/Shell/Shell – CdSe/ZnSe/ZnS

Figure 1. StremDots™ Quantum Dots

The CdSe core has a highly uniform structure with a narrow particle size distribution of ±10%. The CdS or ZnSe shell is below 1nm and provides stability to the core. The second shell of ZnS has a thickness range of 1-2nm and provides additional stability. The characteristics and corresponding ligand capping agent for each structure are listed in the following table:

Key Characteristics of StremDots™ Quantum Dots

The following are the key characteristics of StremDots™ quantum dots:

• Longer term stability
• High quantum yield
• Emission range 525-625nm
• Flexibility for ink or composite preparation
• Homogeneous dispersions in different non-polar solvents possible
• Scalability (manufactured through continuous flow)
• High batch-to-batch reproducibility (TEM available for each lot)

The typical absorption and emission spectra for CdSe core quantum dots are illustrated in Figure 2, and Figure 3 shows a TEM-image of single quantum dots.

Figure 2. Typical spectra for CdSe core quantum dots

Figure 3. TEM-image of single quantum dots

Park emission and quantum yield characteristics of each structure at different particle sizes are listed in the following table:

This information has been sourced, reviewed and adapted from materials provided by Strem Chemicals.

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