TY - JOUR A1 - Grabolle, Markus A1 - Ziegler, J. A1 - Merkulov, A. A1 - Nann, T. A1 - Resch-Genger, Ute T1 - Stability and Fluorescence Quantum Yield of CdSe-ZnS Quantum Dots - Influence of the Thickness of the ZnS Shell JF - Annals of the New York academy of sciences N2 - We investigated the correlation between the thickness of the ZnS shell of CdSe–ZnS quantum dots (QDs), the stability of the particles, and the fluorescence quantum yield. As a measure for stability, a new shell quality test was developed. This test is based on the reaction of the QDs with photochemically formed thiophenol radicals and communicates an imperfect ZnS shell by a rapid and complete loss of fluorescence. The quantum yield increases from less than 5% for unshelled CdSe up to 50%, with an increase in ZnS shell thickness up to 0.6–0.8 nm. At the same time, the particles become significantly more stable, as revealed by the shell test. KW - Quantum dot KW - Nanocrystal KW - Semiconductor KW - Fluorescence KW - Quantum yield KW - CdSe KW - CdSe-ZnS KW - Shell KW - ZnS shell KW - Stability KW - Stability test PY - 2008 DO - https://doi.org/10.1196/annals.1430.021 SN - 0077-8923 SN - 1749-6632 SN - 0094-8500 VL - 1130 SP - 235 EP - 241 PB - New York Academy of Sciences CY - New York, NY AN - OPUS4-17743 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -