PECASE: Organic Ligands as Tools to Analyze and Control Electronic Relaxation in Flourescent Quantum Dots
Abstract
The major goals of this study are: i) identify general categories of nonradiative decay processes from both the lowest-energy band-edge excited state and higher-lying states present in CdSe QDs; ii) identify the rates and specific mechanisms by which these processes dephase or relax the excited states of the QD; iii) identify the physical and chemical features of the QD surfaces that promote or enable each decay process; and iv)decrease the contribution of nonradiative decay and, thereby increase PL quantum yield, by synthetically altering the surface chemistry of the QDs. To achieve these objectives, we will use the ligands themselves as probes: we will produce a series of solution-phase CdSe QD-ligand systems, where the electronic and chemical properties of the ligands, and the percent of surface sites covered by the ligands, vary systematically.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 24, 2019
- Accession Number
- AD1079142
Entities
People
- Emily A. Weiss
Organizations
- Northwestern University