1 research outputs found
Hybrid Colloidal Stabilization Mechanism toward Improved Photoluminescence and Stability of CdSe/CdS Core/Shell Quantum Dots
Colloidal
quantum dots can be stabilized in either a polar solvent
or a nonpolar solvent depending on their surface chemistry. The former
is typically achieved by charge stabilization while the latter by
steric hindrance. This allows reversible tuning of their surface polarity
for targeted application by engineering their ligand profile. Here
we developed a hybrid stabilization approach that leveraged a combination
of steric hindrance and charge stabilization simultaneously. We demonstrated
this mechanism in a phase transfer process where hexane dispersed
and hydrophobic CdSe/CdS core/shell quantum dots were exchanged into
the hydrophilic dimethylformamide (DMF) phase. This was achieved by
employing both Z-type cadmium acetate and X-type halide ligands. The
results suggested only by using this hybrid stabilization strategy
were we able to achieve good colloidal stability while preserving
their photoluminescence quantum yield. This hybrid ligand strategy
may promise new opportunities for the application of QDs in optoelectronic
areas