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Energy-Conserving Surface Hopping for Auger Processes.
J Chem Theory Comput
July 2024
Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States.
Auger-type processes are ubiquitous in nanoscale materials because quantum confinement enhances Coulomb interactions, and there exist large densities of states. Modeling Auger processes requires the modification of nonadiabatic (NA) molecular dynamics algorithms to include transitions caused by both NA and Coulomb couplings. The system is split into quantum and classical subsystems, e.
View Article and Find Full Text PDFAcceleration of Biexciton Radiative Recombination at Low Temperature in CdSe Nanoplatelets.
Nano Lett
September 2022
Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.
Colloidal semiconductor nanocrystals offer bandgap tunability, high photoluminescence quantum yield, and colloidal processing of benefit to optoelectronics, however rapid nonradiative Auger recombination (AR) deleteriously affects device efficiencies at elevated excitation intensities. AR is understood to transition from temperature-dependent behavior in bulk semiconductors to temperature-independent behavior in zero-dimensional quantum dots (QDs) as a result of discretized band structure that facilitates satisfaction of linear momentum conservation. For nanoplatelets (NPLs), two-dimensional morphology renders prediction of photophysical behaviors challenging.
View Article and Find Full Text PDFBiexciton Binding Energy and Line width of Single Quantum Dots at Room Temperature.
Nano Lett
July 2021
Debye Institute, Utrecht University, Princetonplein 1, 3584 CC Utrecht, The Netherlands.
Broadening of multiexciton emission from colloidal quantum dots (QDs) at room temperature is important for their use in high-power applications, but an in-depth characterization has not been possible until now. We present and apply a novel spectroscopic method to quantify the biexciton line width and biexciton binding energy of single CdSe/CdS/ZnS colloidal QDs at room temperature. In our method, which we term "cascade spectroscopy", we select emission events from the biexciton cascade and reconstruct their spectrum.
View Article and Find Full Text PDFEnergy transfer along Müller cell intermediate filaments isolated from porcine retina: I. Excitons produced by ADH1A dimers upon simultaneous hydrolysis of two ATP molecules.
Spectrochim Acta A Mol Biomol Spectrosc
April 2021
University of Puerto Rico, Rio Piedras Campus, PO Box 23343-3343, USA. Electronic address:
IR exciton propagation was explored in Müller cell (MC) intermediate filaments (IFs) filling a capillary matrix. These IFs have been isolated from porcine retina using different methods, while their properties were almost identical. Therefore, IFs isolated from the whole retinas were used presently.
View Article and Find Full Text PDFHot Biexciton Effect on Optical Gain in CsPbI Perovskite Nanocrystals.
J Phys Chem Lett
May 2018
Institute for Chemical Research , Kyoto University, Uji , Kyoto 611-0011 , Japan.
Combining the superior optical properties of their bulk counterparts with quantum confinement effects, lead halide perovskite nanocrystals are unique laser materials with low-threshold optical gain. In such nonlinear optical regimes, multiple excitons are generated in the nanocrystals and strongly affect the optical gain through many-body interactions. Here, we investigate the exciton-exciton interactions in CsPbI nanocrystals by femtosecond transient absorption spectroscopy.
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