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Metastable multi-excitonic states (MES) of semiconductor quantum dots can be involved in multi-electron transfer reaction, which opens new perspectives in nanomaterials-based opto-electronic applications. Herein, we demonstrate the generation of MES in CsPbBr3 perovskite quantum dots (PQD) and its dissociation dynamics through multiple electrons transfer to molecular electron acceptors, anthraquinones (AQs), bound to the PQD surface by carboxylic anchor. As many as 14 excitons are produced at excitation density of roughly 220 µJ cm-2 without detectable PQD degradation. Addition of AQ results in formation of PQD-AQ hybrids with excess of AQs (
AQ ≈ 1:20), which opens the possibility of multi-electron transfer acts from MES to AQs. We found that the electron transfer saturates after roughly five transfer acts and the first ET time constant is as short as 1 ps. However, each ET increases Coulomb potential barrier for the next ET, which decreases the rate of ET resulting a saturation after five ETs.
This article was published in the following journal.
Name: The journal of physical chemistry letters
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Nanometer sized fragments (the dots) of semiconductor crystalline material which emit PHOTONS. The wavelength is based on the quantum confinement size of the dot. They are brighter and more persistent than organic chemical INDICATORS. They can be embedded in MICROBEADS for high throughput ANALYTICAL CHEMISTRY.
Nanometer-sized particles that are nanoscale in three dimensions. They include nanocrystaline materials; NANOCAPSULES; METAL NANOPARTICLES; DENDRIMERS, and QUANTUM DOTS. The uses of nanoparticles include DRUG DELIVERY SYSTEMS and cancer targeting and imaging.
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A loosely defined group of drugs that tend to increase behavioral alertness, agitation, or excitation. They work by a variety of mechanisms, but usually not by direct excitation of neurons. The many drugs that have such actions as side effects to their main therapeutic use are not included here.
An imaging technique using a device which combines TOMOGRAPHY, EMISSION-COMPUTED, SINGLE-PHOTON and TOMOGRAPHY, X-RAY COMPUTED in the same session.