Speaker
Description
Since 2013 zero-dimensional, spherical quantum dots (QDs) are used by the display industry for high-end devices with improved color gamut compared to non-QD LED TVs. In
contrast, the next generation of optoelectronic devices will most likely be based on quantum materials with superior core/shell structures like “Dot-in-GiantShell” (GS-QD), “Dot-in-Rod” (DR) or “Dot-in-Sheet” (DS) nanoheterostructures because of their unique optical properties like narrow band widths, high stability, increased brightness, huge absorption
coefficient in the blue, polarized emission and on/off switchability in an electric field. For producing these next generation particles Fraunhofer CAN has established a platform technology based on continuous flow to allow automating of the synthesis. This ensures the reproducibility and throughput needed to investigate their use in new optoelectronic applications. We will present how this technique is set-up and explain how the different geometries of the above mentioned particles are achieved.
In case of the Giant Shell particles we will show results for particles with diameters between 10 and 20 nm including TEM analysis, especially the influence of the diameter on quantum yield and absorption characteristics.
In case of the elongated Quantum Rods we will show results for green and red emitting particles with different
aspect ratios including TEM analysis and quantum yields. We will also show measurements proving the degree
of polarization (DOP) on a single particle level and the DOP results for aligned QR film on 1 cm2 electrodes.
In case of the Quantum Sheets we will present TEM and quantum yield measurements and compare their
properties to the 0D and 1D particles mentioned above.
We will also outline how these properties influence their use in certain applications to outline that the perfect QD for every application does not exist. The QD chosen has to fit to the reqirement of the application it should be used for.
| Speaker Country | Germany |
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