Setup for the power-dependent absolute quantum yield measurements: example of upconversion nanoparticles
- Lanthanide-doped up-converting nanoparticles (UCNPs), are promising reporters for bioanalysis and theranostics, which are excitable in the near infrared (NIR) by multiphoton absorption processes, and show multiple narrow emission bands in the visible (vis) and NIR, excellent photostability, and long luminescence lifetimes in the µs range. The rational design of brighter UCNP requires an improved understanding of the radiationless deactivation pathways in UCNP, that are affected by size, surface chemistry, and microenvironment. In this respect, we discuss the experimental requirements on absolute measurements of the upconversion quantum yield and its excitation radiant power density dependence and present the design and characterization of unique integrating sphere setup for such measurements in the vis to IR spectral region including its calibration, the influence of the excitation beam profile and solutions to perform such measurements in aqueous media.
Autor*innen: | Christian WürthORCiD |
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Koautor*innen: | Martin Kaiser, Marco Kraft, Verena Muhr, Stefan Wilhelm, Thomas Hirsch, Ute Resch-GengerORCiD |
Dokumenttyp: | Vortrag |
Veröffentlichungsform: | Präsentation |
Sprache: | Deutsch |
Jahr der Erstveröffentlichung: | 2016 |
DDC-Klassifikation: | Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten |
Freie Schlagwörter: | Nanoparticle; Quantum yield; Upconversion |
Veranstaltung: | Upcon2016 |
Veranstaltungsort: | Breslau, Poland |
Beginndatum der Veranstaltung: | 23.05.2016 |
Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
Datum der Freischaltung: | 23.11.2016 |
Referierte Publikation: | Nein |
Eingeladener Vortrag: | Nein |