Berlin 2012 – wissenschaftliches Programm
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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.