Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: Nanoparticles and Composite Materials

CPP 8.31: Poster

Montag, 26. März 2012, 17:30–20:00, Poster A

Photoluminescence quantum yield of near-infrared emissive nanoparticles — •Soheil Hatami¹, Christian Würth¹, Markus Grabolle¹, Susanne Leubner², Vladimir Lesnyak², Nikolai Gaponik², Alexander Eychmüller², and Ute Resch-Genger¹ — ¹BAM Federal Institute for Materials Research and Testing, Berlin, Germany — ²Physical Chemistry/Electrochemistry , TU Dresden, Dresden, Germany

Semiconductor nanocrystals (quantum dots, QDs) are applied as fluorescent labels and active components in optical devices. QDs emitting in the near-infrared (NIR) and infrared (IR) region like CdTe, CdHgTe, and HgTe are of increasing importance, due to their high photoluminescence quantum yields (QY) compared to any other chromophore at wavelengths above 900 nm. Characterization of their performance requires reliable methods for the determination of QY under application-relevant conditions. For often performed relative optical measurements, standard dyes with precisely known QY are mandatory, with the lack of reliably assessed QY standards for the NIR and IR hampering the performance of such measurements. We established relative and absolute optical methods for the determination of QY of such QDs in this wavelength region. Therewith, we obtained the QY of these QDs from 1.) comparison of the integral emission of the QDs and standard dyes and 2.) absolute measurements of the ratio of emitted and absorbed photons using a calibrated and validated integrating sphere setup.