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.
| Original language | English |
|---|---|
| Article number | 157404 |
| Journal | Physical Review Letters |
| Volume | 104 |
| Issue number | 15 |
| DOIs | |
| Publication status | Published - Apr 16 2010 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Transient fluorescence of the off state in blinking CdSe/CdS/ZnS semiconductor nanocrystals is not governed by auger recombination. / Rosen, Shamir; Schwartz, Osip; Oron, Dan.
In: Physical Review Letters, Vol. 104, No. 15, 157404, 16.04.2010.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Transient fluorescence of the off state in blinking CdSe/CdS/ZnS semiconductor nanocrystals is not governed by auger recombination
AU - Rosen, Shamir
AU - Schwartz, Osip
AU - Oron, Dan
PY - 2010/4/16
Y1 - 2010/4/16
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=77951029945&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77951029945&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.104.157404
DO - 10.1103/PhysRevLett.104.157404
M3 - Article
AN - SCOPUS:77951029945
VL - 104
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 15
M1 - 157404
ER -