Bipolar single-molecule electroluminescence and electrofluorochromism
Understanding the fundamental mechanisms of optoelectronic excitation and relaxation pathways on the single-molecule level has only recently been started by combining scanning tunneling microscopy (STM) and spectroscopy (STS) with STM-induced luminescence (STML). In this paper, we investigate cation...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2023-07-01
|
| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.5.033027 |
| _version_ | 1827285206268116992 |
|---|---|
| author | Tzu-Chao Hung Roberto Robles Brian Kiraly Julian H. Strik Bram A. Rutten Alexander A. Khajetoorians Nicolas Lorente Daniel Wegner |
| author_facet | Tzu-Chao Hung Roberto Robles Brian Kiraly Julian H. Strik Bram A. Rutten Alexander A. Khajetoorians Nicolas Lorente Daniel Wegner |
| author_sort | Tzu-Chao Hung |
| collection | DOAJ |
| description | Understanding the fundamental mechanisms of optoelectronic excitation and relaxation pathways on the single-molecule level has only recently been started by combining scanning tunneling microscopy (STM) and spectroscopy (STS) with STM-induced luminescence (STML). In this paper, we investigate cationic and anionic fluorescence of individual zinc phthalocyanine (ZnPc) molecules adsorbed on ultrathin NaCl films on Ag(111) by using STML. They depend on the tip-sample bias polarity and appear at threshold voltages that are correlated with the onset energies of particular molecular orbitals, as identified by STS. We also find that the fluorescence is caused by a single-electron tunneling process. Comparing with results from density functional theory calculations, we propose an alternative many-body picture to describe the charging and electroluminescence mechanism. In this paper, we provide aspects toward well-defined voltage selectivity of bipolar electrofluorochromism as well as fundamental insights regarding the role of transiently charged states of emitter molecules within organic light-emitting diode devices. |
| first_indexed | 2024-04-24T10:11:04Z |
| format | Article |
| id | doaj.art-cec296d5a24b483ea8c10446269d6239 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:11:04Z |
| publishDate | 2023-07-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-cec296d5a24b483ea8c10446269d62392024-04-12T17:32:28ZengAmerican Physical SocietyPhysical Review Research2643-15642023-07-015303302710.1103/PhysRevResearch.5.033027Bipolar single-molecule electroluminescence and electrofluorochromismTzu-Chao HungRoberto RoblesBrian KiralyJulian H. StrikBram A. RuttenAlexander A. KhajetooriansNicolas LorenteDaniel WegnerUnderstanding the fundamental mechanisms of optoelectronic excitation and relaxation pathways on the single-molecule level has only recently been started by combining scanning tunneling microscopy (STM) and spectroscopy (STS) with STM-induced luminescence (STML). In this paper, we investigate cationic and anionic fluorescence of individual zinc phthalocyanine (ZnPc) molecules adsorbed on ultrathin NaCl films on Ag(111) by using STML. They depend on the tip-sample bias polarity and appear at threshold voltages that are correlated with the onset energies of particular molecular orbitals, as identified by STS. We also find that the fluorescence is caused by a single-electron tunneling process. Comparing with results from density functional theory calculations, we propose an alternative many-body picture to describe the charging and electroluminescence mechanism. In this paper, we provide aspects toward well-defined voltage selectivity of bipolar electrofluorochromism as well as fundamental insights regarding the role of transiently charged states of emitter molecules within organic light-emitting diode devices.http://doi.org/10.1103/PhysRevResearch.5.033027 |
| spellingShingle | Tzu-Chao Hung Roberto Robles Brian Kiraly Julian H. Strik Bram A. Rutten Alexander A. Khajetoorians Nicolas Lorente Daniel Wegner Bipolar single-molecule electroluminescence and electrofluorochromism Physical Review Research |
| title | Bipolar single-molecule electroluminescence and electrofluorochromism |
| title_full | Bipolar single-molecule electroluminescence and electrofluorochromism |
| title_fullStr | Bipolar single-molecule electroluminescence and electrofluorochromism |
| title_full_unstemmed | Bipolar single-molecule electroluminescence and electrofluorochromism |
| title_short | Bipolar single-molecule electroluminescence and electrofluorochromism |
| title_sort | bipolar single molecule electroluminescence and electrofluorochromism |
| url | http://doi.org/10.1103/PhysRevResearch.5.033027 |
| work_keys_str_mv | AT tzuchaohung bipolarsinglemoleculeelectroluminescenceandelectrofluorochromism AT robertorobles bipolarsinglemoleculeelectroluminescenceandelectrofluorochromism AT briankiraly bipolarsinglemoleculeelectroluminescenceandelectrofluorochromism AT julianhstrik bipolarsinglemoleculeelectroluminescenceandelectrofluorochromism AT bramarutten bipolarsinglemoleculeelectroluminescenceandelectrofluorochromism AT alexanderakhajetoorians bipolarsinglemoleculeelectroluminescenceandelectrofluorochromism AT nicolaslorente bipolarsinglemoleculeelectroluminescenceandelectrofluorochromism AT danielwegner bipolarsinglemoleculeelectroluminescenceandelectrofluorochromism |