Analytische Chemie
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Ternary semiconductors Quantum Dots (t-QD) are Cd-free semiconductors nanocrystals made from I-III-VI group elements like CIS or AIS. They are interesting alternatives for Cd-based QDs for applications as optically active components in solar concentrators or solar cells, light emitting diodes (LED) or in the life sciences. To enhance the PL quantum yield (PL QY) and prevent material deterioration and oxidation, these QDs are commonly surface-passivated with by ZnS shell.
AIS QDs exhibit broad photoluminescence (PL) spectra in the visible and near infrared, which are tunable by size, chemical composition (ratio of components or doping), and surface ligand. They show a relatively high absorption coefficient, high PL QY (up to 70%), and long luminescence lifetimes in the order of a few hundred nanoseconds that make them promising materials for a broad variety of applications. Moreover, they can be simply prepared even in water in high quality which avoids further ligand exchange steps for all water-based applications know to decrease QY.
Here we present a systematic spectroscopic study of differently colored AIS/ZnS QDs synthesized in water, size selected by precipitation, transferred to organic solvents via ligand exchange, and embedded in different polymers by a photochemically initiated polymerization. The PL properties including PL QY and the PL decay kinetics measured in different matrices are shown and discussed.