34 research outputs found

    Charge-tunnelling and self-trapping: common origins for blinking, grey-state emission and photoluminescence enhancement in semiconductor quantum dots

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    Understanding instabilities in the photoluminescence (PL) from light emitting materials is crucial to optimizing their performance for different applications. Semiconductor quantum dots (QDs) offer bright, size tunable emission, properties that are now being exploited in a broad range of developing technologies from displays and solar cells to biomaging and optical storage. However, instabilities such as photoluminescence intermittency, enhancement and bleaching of emission in these materials can be detrimental to their utility. Here, we report dielectric dependent blinking, intensity-“spikes” and low-level, “grey”-state emission, as well as PL enhancement in ZnS capped CdSe QDs; observations that we found consistent with a charge-tunnelling and self-trapping (CTST) description of exciton-dynamics on the QD–host system. In particular, modulation of PL in grey-states and PL enhancement are found to have a common origin in the equilibrium between exciton charge carrier core and surface-states within the CTST framework. Parameterized in terms of size and electrostatic properties of the QD and its nanoenvironment, the CTST offers predictive insight into exciton-dynamics in these nanomaterials

    Der Verbalkomplex im Frühneuhochdeutschen

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    In dieser Dissertation geht es um die Analyse des Verbalkomplexes im Frühneuhochdeutschen. Auf Basis zweier Texte aus dem 15. Jh. wurde ein digitales Korpus erstellt, dass mit linguistischer Information ausgezeichnet und linguistisch analysiert wurde. Im Vordergrund der Analyse stehen folgende Fragen: Welche Serialisierungsvarianten werden verwendet? Unterscheiden sich beide Korpora hinsichtlich der Häufigkeit, mit der diese unterschiedlichen Varianten verwendet werden? Welche Faktoren beeinflussen die Wahl einer spezifischen Serialisierung? Für den Fall, dass mehrere Faktoren auf die Serialisierung wirken: Welches Modell bildet das Zusammenspiel dieser Faktoren bestmöglich ab? Abschliessend wurden diese Ergebnisse mit der diachronen Entwicklung einzelner Serialisierungsarten in Verbindung gebracht. Dafür wird ein gebrauchsbasierter, kognitiver Ansatz verwendet, indem mit Hilfe von Frequenzeffekten die jeweils unterschiedliche Entwicklung einzelner Serialisierungsarten erklärt wird

    Efficacy and safety of modified-release prednisone in patients with rheumatoid arthritis

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    Marco Krasselt, Christoph Baerwald Rheumatology Unit, Clinic for Gastroenterology and Rheumatology, Department of Internal Medicine, Neurology and Dermatology, University of Leipzig, Leipzig, Germany Abstract: The introduction of modified-release (MR) prednisone adds a drug with encouraging potential to the armamentarium of the rheumatologist. In particular, for patients experiencing a reduced quality of life due to prolonged morning stiffness, it is a promising therapeutic approach. Two clinical trials and one open-label observational study investigated the effectiveness of MR prednisone in reducing rheumatoid arthritis-related morning stiffness for both new and current users of corticosteroids. The efficacy and safety of MR prednisone use in rheumatoid arthritis patients are reviewed in this article. This includes pivotal trials as well as pathophysiological considerations and clinical implications. Keywords: modified-release prednisone, rheumatoid arthritis, efficacy, chronotherapy, HPA axis, side effects, low-dose prednisone&nbsp

    BBA-Proteins Proteomics

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    Development of an in-tube diagnostic assay for cellular autoimmune monitoring in psoriatic arthritis

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    Increased SLAMF7 expression on monocytes in rheumatoid arthritis

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