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

CANdots Quantum Dots

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:

Structure Ligand Capping Agent Stability of Dispersions Quantum Yield Emission Range
CdSe core Oleylamine 6 months >10% 525-625nm
CdSe/CdS core/shell Hexadecylamine >6 months >30% 550-600nm
CdSe/ZnSe/ZnS core/shell/shell Hexadecylamine >12 months >30-40% 525-625nm

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.

Typical spectra for CdSe core quantum dots

Typical spectra for CdSe core quantum dots

Figure 2. Typical spectra for CdSe core quantum dots

TEM-image of single 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:

Peak Emmission Particle Size (diameter) Strem Catalog No. (in hexane) Quantum Yield
CdSe core
525nm 2.8nm 48-1G11 >10%
55Gnm 3.5nm 48-1 G1 7 >10%
575nm 3.9nm 48-1 G23 >10%
6GGnm 4.7nm 48-1 G3G >10%
625nm 5.3nm 48-1 G35 >10%
Kit: 525-625nm   96-G8GG >10%
Kit contains 5ml of each of the above 5 products. Ligand capping agent oleylamine. Stable in dispersions 6 months.
CdSe/CdS core/shell
55Gnm 3.7nm 48-1G4G >30%
575nm 4.1 nm 48-1 G46 >30%
6GGnm 4.9nm 48-1 G52 >30%
Ligand capping agent hexadecylamine. Stable in dispersions >6 months.
CdSe/ZnSe/ZnS core/shell/shell
525nm 3.Gnm 48-1G61 >40%
55Gnm 4.6nm 48-1 G63 >40%
575nm 5.1 nm 48-1 G7G >40%
6GGnm 6.Gnm 48-1 G75 >40%
625nm 6.6nm 48-1 G8G >30%
Kit: 525-625nm   96-G82G >30 - 40%
Kit contains 1ml of each of the above 5 products. Ligand capping agent hexadecylamine. Stable in dispersions >12 months.

 

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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