%0 Journal Article %1 doi:10.1021/acsnano.2c03083 %A Li, Min-Ken %A Riaz, Adnan %A Wederhake, Martina %A Fink, Karin %A Saha, Avishek %A Dehm, Simone %A He, Xiaowei %A Schöppler, Friedrich %A Kappes, Manfred M. %A Htoon, Han %A Popov, Valentin N. %A Doorn, Stephen K. %A Hertel, Tobias %A Hennrich, Frank %A Krupke, Ralph %D 2022 %J ACS Nano %K doping excitons myown swnt %N 0 %P ASAP %R 10.1021/acsnano.2c03083 %T Electroluminescence from Single-Walled Carbon Nanotubes with Quantum Defects %U https://pubs.acs.org/doi/10.1021/acsnano.2c03083 %V 0 %X 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.

@article{doi:10.1021/acsnano.2c03083, abstract = { 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. }, added-at = {2022-07-04T11:35:15.000+0200}, author = {Li, Min-Ken and Riaz, Adnan and Wederhake, Martina and Fink, Karin and Saha, Avishek and Dehm, Simone and He, Xiaowei and Schöppler, Friedrich and Kappes, Manfred M. and Htoon, Han and Popov, Valentin N. and Doorn, Stephen K. and Hertel, Tobias and Hennrich, Frank and Krupke, Ralph}, biburl = {https://www.bibsonomy.org/bibtex/2ab7cc932cb7a7e686d6136e61f227032/hertel-group}, doi = {10.1021/acsnano.2c03083}, eprint = {https://doi.org/10.1021/acsnano.2c03083}, interhash = {78665fc70711d46ab16ea401d3a87037}, intrahash = {ab7cc932cb7a7e686d6136e61f227032}, journal = {ACS Nano}, keywords = {doping excitons myown swnt}, note = {PMID: 35732039}, number = 0, pages = {ASAP}, timestamp = {2022-07-04T11:39:29.000+0200}, title = {Electroluminescence from Single-Walled Carbon Nanotubes with Quantum Defects}, url = {https://pubs.acs.org/doi/10.1021/acsnano.2c03083}, volume = 0, year = 2022 }