Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 27: Nanoparticles and Composite Materials II
CPP 27.5: Vortrag
Mittwoch, 13. März 2013, 16:00–16:15, H39
New Tools for reliable photoluminescence quantum yield measurements of near-infrared emissive quantum dots — •Soheil Hatami1, Susanne Leubner2, Vladimir Lesnyak2, Nikolai Gaponik2, Christan Würth1, Markus Grabolle1, Alexander Eychmüller2, and Ute Resch-Genger1 — 1BAM Federal Institute for Materials Research and Testing, Berlin, Germany — 2Physical Chemistry/Electrochemistry, TU Dresden, Dresden, Germany
Semiconductor quantum dots (QDs) are applied as fluorescent labels and active components in optical devices. QDs emitting in the near-infrared (NIR) region like CdTe, and CdHgTe are of increasing importance, due to their high photoluminescence quantum yields (QY) compared to any other chromophore at wavelengths above 900 nm. The characterization of the performance of these NIR and IR QDs requires reliable methods for the determination of QY under biological 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 hampering the performance of such measurements. This encouraged us to design a new integrating sphere setup for the absolute measurement of QY values in the spectral range of 600 nm to 1700 nm and to develop procedures for the relative and absolute determination of QY of emissive materials in this wavelength region. Here, the design of our setup and its calibration will be presented as well as first QY measurement of NIR dyes and CdTeHg QDs of varying size and material composition.