Multi-Photon Excitation of CsPbBr Perovskite Quantum Dots: How Many Electrons Can One PQD Donate to Multiple Molecular Acceptors?

08:00 EDT 9th May 2019 | BioPortfolio

Summary of "Multi-Photon Excitation of CsPbBr Perovskite Quantum Dots: How Many Electrons Can One PQD Donate to Multiple Molecular Acceptors?"

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.


Journal Details

This article was published in the following journal.

Name: The journal of physical chemistry letters
ISSN: 1948-7185


DeepDyve research library

PubMed Articles [6566 Associated PubMed Articles listed on BioPortfolio]

In vivo Deep-Brain Structural and Hemodynamic Multiphoton Microscopy Enabled by Quantum Dots.

Visualizing deep-brain vasculature and hemodynamics is key to understanding brain physiology and pathology. Among the various adopted imaging modalities, multiphoton microscopy (MPM) is well-known for...

A spin-photon interface using charge-tunable quantum dots strongly coupled to a cavity.

Charged quantum dots containing an electron or hole spin are bright solid-state qubits suitable for quantum networks and distributed quantum computing. Incorporating such quantum dot spin into a photo...

Exploring Orbit-Orbit Interaction in Relationship with Photoluminescence Quantum Efficiency in Perovskite Quantum Dots through Rashba Effects.

Metal halide perovskite quantum dots attract significant research interest in recent years due to their exceptional optical properties, such as tunable emission wavelength, strong quantum confinement ...

Room-temperature up-conversion random lasing from CsPbBr quantum dots with TiO nanotubes.

We report successful room-temperature up-conversion random lasing by distributing CsPbBr quantum dots (QDs) uniformly into TiO nanotubes (NTs). In order to overcome the difficulty in purifying the QDs...

CsPbBr Quantum Dots 2.0: Benzenesulfonic Acid Equivalent Ligand Awakens Complete Purification.

The stability and optoelectronic device performance of perovskite quantum dots (Pe-QDs) are severely limited by present ligand strategies since these ligands exhibit a highly dynamic binding state, re...

Clinical Trials [3246 Associated Clinical Trials listed on BioPortfolio]

Topical Fluorescent Nanoparticles Conjugated Somatostatin Analog for Suppression and Bioimaging Breast Cancer

Breast cancer is a communal malignant disease between Saudi females, with a popularity of 21.8%. Since binding to somatostatin receptors (SSTR) induces no immunogenicity in vivo, somatosta...

A Randomized Trial of DOTS Versus Enhanced DOTS for Community Control of Tuberculosis

This study will test the effectiveness of two different tuberculosis (TB) prevention strategies, DOTS or DOTS-A. DOTS is the current prevention strategy for TB. DOTS-A is an enhanced preve...

Personalized Quantum Sonotherapy in Regional Anesthesia

The objetive of the study is to evaluate the effect of personalized quantum sonotherapy on the level of anxiety and pain in outpatients schedule for orthopedic surgery under regional anest...

Efficacy of Thrice Weekly Directly Observed Treatment, Short-Course (DOTS) in HIV-Associated Tuberculosis

Tuberculosis (TB) is the most common opportunistic infection among HIV infected persons living in developing countries. Directly observed treatment, short-course (DOTS) is the internationa...

Treatment Duration for Abdominal Tuberculosis

Most of the guidelines on the treatment of tuberculosis suggest that 6 months treatment is sufficient for extrapulmonary tuberculosis except for bone tuberculosis and tubercular meningitis...

Medical and Biotech [MESH] Definitions

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.

Tomography using single-photon emitting RADIONUCLIDES to create images that are captured in times corresponding to various points in the cardiac cycle.

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.

Quick Search

DeepDyve research library

Searches Linking to this Article