TY - GEN A1 - Weigert, Florian T1 - Photoluminescence Properties of coreshell CdSe Nanocrystals with Different Shells and Surface Chemistries Derived from Ensemble and Single Particle Measurements N2 - The optical properties of semiconductor nanocrystals (SCNCs) depend on constituent material, particle size, and surface chemistry, with the size of the photoluminescence (PL) quantum yield (QY) and the PL decay kinetics being largely controlled by the number of dangling bonds, which have to be properly passivated for high quality materials. Hence, PL measurements can provide insight not only in SCNC photophysics, yet can be also used for quality control of SCNC synthesis and surface modification. In this respect, steady state and time-resolved fluorometry and confocal microscopy with time correlated single photon counting were used to study the PL properties of core-shell CdSe SCNCs with different shells and surface chemistries on ensemble and single particle level, thereby focusing on a correlation of ensemble PL QY and PL decay kinetics with particle brightness, PL time traces, and the On-time fraction of single SCNCs. Additionally, confocal PL images were correlated with AFM measurements in order to derive the amount of absorbing, yet non-emissive ”dark” SCNCs, the presence of which resulting in an underestimation of ensemble PL quantum yields. The results of this study can help to identify synthetic routes and surface modifications, which minimize the fraction of dark SCNCs. T2 - PicoQuant 22nd International Workshop on Single Molecule and Super-Resolution Microscopy in the Life Sciences CY - Berlin, Germany DA - 14.09.2016 KW - Single molecule KW - SCNC KW - QY KW - AFM KW - Confocal PY - 2016 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/38121 AN - OPUS4-38121 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany