Chemische Charakterisierung und Spurenanalytik
Filtern
Erscheinungsjahr
- 2018 (1)
Dokumenttyp
- Vortrag (1)
Sprache
- Englisch (1)
Referierte Publikation
- nein (1)
Schlagworte
- Modeling (1) (entfernen)
Organisationseinheit der BAM
Eingeladener Vortrag
- nein (1) (entfernen)
Common approaches to improve the optical properties of semiconductor quantum dots and lanthanide doped nanophosphors present core/shell structures as radiationless deactivation at the particle surface is usually the main energy loss mechanism. This has led to increasingly sophisticated particle architectures using multishell systems with shells of different chemical composition and thickness and initiated an increasing number of quantitative spectroscopic studies focusing on the key performance parameter photoluminescence quantum yield to identify optimum particle structures. This is particularly challenging in the long wavelength region > 1000 nm and for nonlinear emitters like upconversion nanocrystals. Here, we present suitable absolute methods to quantify the photoluminescence of these different emitters in the vis/NIR/IR and as function of excitation power density and underline the impact of such measurements on a profound mechanistic understanding of the nonradiative deactivation pathways in semiconductor and upconversion nanocrystals of different size and particle architecture in different environments.