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Title: Exciton relaxation in carbon nanotubes via electronic-to-vibrational energy transfer

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.5121300· OSTI ID:1572329

Covalent functionalization of semiconducting single-wall carbon nanotubes (CNTs) introduces new photoluminescent emitting states. These states are spatially localized around functionalization sites and strongly red-shifted relative to the emission commonly observed from the CNT band-edge exciton state. A particularly important feature of these localized exciton states is that because the exciton is no longer free to diffusively sample photoluminescent quenching sites along the CNT length, its lifetime is significantly extended. We have recently demonstrated that an important relaxation channel of such localized excitons is the electronic-to-vibrational energy transfer (EVET). This process is analogous to the Förster resonance energy transfer except the final state of this process is not electronically, but vibrationally excited molecules of the surrounding medium (e.g., solvent). In this work, we develop a theory of EVET for a nanostructure of arbitrary shape and apply it to the specific case of EVET-mediated relaxation of defect-localized excitons in a covalently functionalized CNT. Here, the resulting EVET relaxation times are in good agreement with experimental data.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1572329
Report Number(s):
LA-UR-19-22301; TRN: US2001238
Journal Information:
Journal of Chemical Physics, Vol. 151, Issue 14; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

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Cited By (2)

Tailoring spontaneous infrared emission of HgTe quantum dots with laser-printed plasmonic arrays journal February 2020
Optical and structural properties of flash evaporated HgTe thin films journal April 2006