Electroluminescence from Single-Walled Carbon Nanotubes with Quantum Defects
- Karlsruhe Institute of Technology (Germany); Technische Univ. Darmstadt (Germany)
- Technische Univ. Darmstadt (Germany); Karlsruhe Institute of Technology (Germany)
- Julius Maximilian University Würzburg (Germany)
- Karlsruhe Institute of Technology (Germany)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of Sofia (Bulgaria)
Individual single-walled carbon nanotubes with covalent sidewall defects have emerged as a class of photon sources whose photoluminescence spectra can be tailored by the carbon nanotube chirality and the attached functional group/molecule. Here we present electroluminescence spectroscopy data from single-tube devices based on (7, 5) carbon nanotubes, functionalized with dichlorobenzene molecules, and wired to graphene electrodes. We observe electrically generated, defect-induced emissions that are controllable by electrostatic gating and strongly red-shifted compared to emissions from pristine nanotubes. The defect-induced emissions are assigned to excitonic and trionic recombination processes by correlating electroluminescence excitation maps with electrical transport and photoluminescence data. At cryogenic conditions, additional gate-dependent emission lines appear, which are assigned to phonon-assisted hot-exciton electroluminescence from quasi-levels. Similar results were obtained with functionalized (6, 5) nanotubes. We also compare functionalized (7, 5) electroluminescence data with photoluminescence of pristine and functionalized (7, 5) nanotubes redox-doped using gold(III) chloride solution. This work shows that electroluminescence excitation is selective toward neutral defect-state configurations with the lowest transition energy, which in combination with gate-control over neutral versus charged defect-state emission leads to high spectral purity.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- German National Science Foundation; USDOE Office of Science (SC). Materials Sciences & Engineering
- Grant/Contract Number:
- 89233218CNA000001
- OSTI ID:
- 1879407
- Report Number(s):
- LA-UR-22-26725
- Journal Information:
- ACS Nano, Journal Name: ACS Nano Journal Issue: 8 Vol. 16; ISSN 1936-0851
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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