AI Article Synopsis
- The study investigates light emission from semiconductor nanocrystals, challenging the idea that Auger recombination is the main cause of intermittent light quenching.
- Time-resolved photon counting reveals that the size and intensity of emission decay do not match what would be expected from Auger processes.
- Instead, the findings suggest a three-step cycle in which the quantum dot undergoes photoexcitation, rapid trapping, and slow nonradiative decay in its "off" state.
Article Abstract
The observed intermittent light emission from colloidal semiconductor nanocrystals has long been associated with Auger recombination assisted quenching. We test this view by observing transient emission dynamics of CdSe/CdS/ZnS semiconductor nanocrystals using time-resolved photon counting. The size and intensity dependence of the observed decay dynamics seem inconsistent with those expected from Auger processes. Rather, the data suggest that in the "off" state the quantum dot cycles in a three-step process: photoexcitation, rapid trapping, and subsequent slow nonradiative decay.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.104.157404 | DOI Listing |
Publication Analysis
Top Keywords
semiconductor nanocrystals
12
cdse/cds/zns semiconductor
8
auger recombination
8
transient fluorescence
4
fluorescence state
4
state blinking
4
blinking cdse/cds/zns
4
nanocrystals governed
4
governed auger
4
recombination observed
4
Similar Publications
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!