Abstract
This Perspective discusses recent work on mechanisms by which organic ligands affect the electronic structure and exciton dynamics of colloidal quantum dots (QDs). Much of the work described here uses some combination of steady-state absorption, transient absorption, steady-state photoluminescence, and transient photoluminescence spectroscopies to characterize QD-ligand complexes. Ligands affect the ground-state electronic structure of QDs via mixing of the frontier orbitals at the QD-ligand interface and influence the dynamics of excitonic decay by mediating charge trapping or by participating in charge transfer. This Perspective highlights strategies to address the various forms of structural and chemical heterogeneity of QD ensembles in identifying the mechanisms of these ligand-mediated processes. Finally, four-wave mixing techniques are discussed as promising methods for direct measurement of ligand-mediated nonradiative dissipation of the QD exciton.
| Original language | English |
|---|---|
| Pages (from-to) | 18-26 |
| Number of pages | 9 |
| Journal | Journal of Physical Chemistry Letters |
| Volume | 3 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jan 5 2012 |
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ASJC Scopus subject areas
- Materials Science(all)
Cite this
Colloidal quantum dots : Think outside the (particle-in-a-)box. / Knowles, Kathryn E.; Frederick, Matthew T.; Tice, Daniel B.; Morris-Cohen, Adam J.; Weiss, Emily A.
In: Journal of Physical Chemistry Letters, Vol. 3, No. 1, 05.01.2012, p. 18-26.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Colloidal quantum dots
T2 - Think outside the (particle-in-a-)box
AU - Knowles, Kathryn E.
AU - Frederick, Matthew T.
AU - Tice, Daniel B.
AU - Morris-Cohen, Adam J.
AU - Weiss, Emily A
PY - 2012/1/5
Y1 - 2012/1/5
N2 - This Perspective discusses recent work on mechanisms by which organic ligands affect the electronic structure and exciton dynamics of colloidal quantum dots (QDs). Much of the work described here uses some combination of steady-state absorption, transient absorption, steady-state photoluminescence, and transient photoluminescence spectroscopies to characterize QD-ligand complexes. Ligands affect the ground-state electronic structure of QDs via mixing of the frontier orbitals at the QD-ligand interface and influence the dynamics of excitonic decay by mediating charge trapping or by participating in charge transfer. This Perspective highlights strategies to address the various forms of structural and chemical heterogeneity of QD ensembles in identifying the mechanisms of these ligand-mediated processes. Finally, four-wave mixing techniques are discussed as promising methods for direct measurement of ligand-mediated nonradiative dissipation of the QD exciton.
AB - This Perspective discusses recent work on mechanisms by which organic ligands affect the electronic structure and exciton dynamics of colloidal quantum dots (QDs). Much of the work described here uses some combination of steady-state absorption, transient absorption, steady-state photoluminescence, and transient photoluminescence spectroscopies to characterize QD-ligand complexes. Ligands affect the ground-state electronic structure of QDs via mixing of the frontier orbitals at the QD-ligand interface and influence the dynamics of excitonic decay by mediating charge trapping or by participating in charge transfer. This Perspective highlights strategies to address the various forms of structural and chemical heterogeneity of QD ensembles in identifying the mechanisms of these ligand-mediated processes. Finally, four-wave mixing techniques are discussed as promising methods for direct measurement of ligand-mediated nonradiative dissipation of the QD exciton.
UR - http://www.scopus.com/inward/record.url?scp=84855464210&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84855464210&partnerID=8YFLogxK
U2 - 10.1021/jz2013775
DO - 10.1021/jz2013775
M3 - Article
AN - SCOPUS:84855464210
VL - 3
SP - 18
EP - 26
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
SN - 1948-7185
IS - 1
ER -