ArticleThe journal of physical chemistry letters2022
Excited States and Their Dynamics in CdSe Quantum Dots Studied by Two-Color 2D Spectroscopy.
Article in The journal of physical chemistry letters, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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4 citing papers in PubMed.
- Self-Consistent Study of the Electronic Properties of a Single Exciton in Nanoscopic CdSe Quantum Dots.Nanomaterials (Basel, Switzerland) · 2026Article
- A quantum information processing machine for computing by observables.Proceedings of the National Academy of Sciences of the United States of America · 2023Article
- Ultrafast Coherent Delocalization Revealed in Multilayer QDs under a Chiral Potential.The journal of physical chemistry letters · 2023Article
- CdSe-CoMikrochimica acta · 2023Article
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8 authors.
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Abstract
Quantum dots (QDs) form a promising family of nanomaterials for various applications in optoelectronics. Understanding the details of the excited-state dynamics in QDs is vital for optimizing their function. We apply two-color 2D electronic spectroscopy to investigate CdSe QDs at 77 K within a broad spectral range. Analysis of the electronic dynamics during the population time allows us to identify the details of the excitation pathways. The initially excited high-energy electrons relax with the time constant of 100 fs. Simultaneously, the states at the band edge rise within 700 fs. Remarkably, the excited-state absorption is rising with a very similar time constant of 700 fs. This makes us reconsider the earlier interpretation of the excited-state absorption as the signature of a long-lived trap state. Instead, we propose that this signal originates from the excitation of the electrons that have arrived in the conduction-band edge.
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