Excited-State Dynamics of Bis(tetraethylammonium) Di-µ-bromo-dibromodicuprate(I) Thin Films
Organic–inorganic halocuprates based on monovalent copper are promising luminescent compounds for optoelectronic applications; however, their relaxation processes in the excited electronic state are severely underexplored. In this contribution, we prepare thin films of bis(tetraethylammonium) di-µ-b...
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MDPI AG
2023-11-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/28/23/7841 |
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| author | Domenic Gust Mirko Scholz Kawon Oum Thomas Lenzer |
| author_facet | Domenic Gust Mirko Scholz Kawon Oum Thomas Lenzer |
| author_sort | Domenic Gust |
| collection | DOAJ |
| description | Organic–inorganic halocuprates based on monovalent copper are promising luminescent compounds for optoelectronic applications; however, their relaxation processes in the excited electronic state are severely underexplored. In this contribution, we prepare thin films of bis(tetraethylammonium) di-µ-bromo-dibromodicuprate(I) [N(C<sub>2</sub>H<sub>5</sub>)<sub>4</sub>]<sub>2</sub>[Cu<sub>2</sub>Br<sub>4</sub>], abbreviated (TEA)<sub>2</sub>Cu<sub>2</sub>Br<sub>4</sub>, which features a “molecular salt” structure containing discrete [Cu<sub>2</sub>Br<sub>4</sub>]<sup>2−</sup> anions. This compound, which has an absorption peak at 283 nm, displays a blue, strongly Stokes-shifted emission with a peak at 467 nm. Transient photoluminescence (PL) experiments using broadband emission detection and time-correlated single-photon counting (TCSPC) both find an excited-state lifetime of 57 μs at 296 K. UV–Vis transient absorption experiments at 296 K covering time scales from femto- to microseconds provide evidence for the formation of the T<sub>1</sub> state through intersystem crossing from S<sub>1</sub> with a time constant of 184 ps. The triplet state subsequently decays to S<sub>0</sub> predominantly by phosphorescence. In addition, the time constants for carrier–optical phonon scattering (1.8 ps) and acoustic phonon relaxation (8.3 ns and 465 ns) of (TEA)<sub>2</sub>Cu<sub>2</sub>Br<sub>4</sub> are provided. |
| first_indexed | 2024-03-09T01:45:38Z |
| format | Article |
| id | doaj.art-100a6e3f92694614a7cc28d888302f23 |
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| language | English |
| last_indexed | 2024-03-09T01:45:38Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-100a6e3f92694614a7cc28d888302f232023-12-08T15:22:30ZengMDPI AGMolecules1420-30492023-11-012823784110.3390/molecules28237841Excited-State Dynamics of Bis(tetraethylammonium) Di-µ-bromo-dibromodicuprate(I) Thin FilmsDomenic Gust0Mirko Scholz1Kawon Oum2Thomas Lenzer3Physical Chemistry 2, Department Chemistry and Biology, Faculty IV: School of Science and Technology, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, GermanyPhysical Chemistry 2, Department Chemistry and Biology, Faculty IV: School of Science and Technology, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, GermanyPhysical Chemistry 2, Department Chemistry and Biology, Faculty IV: School of Science and Technology, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, GermanyPhysical Chemistry 2, Department Chemistry and Biology, Faculty IV: School of Science and Technology, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, GermanyOrganic–inorganic halocuprates based on monovalent copper are promising luminescent compounds for optoelectronic applications; however, their relaxation processes in the excited electronic state are severely underexplored. In this contribution, we prepare thin films of bis(tetraethylammonium) di-µ-bromo-dibromodicuprate(I) [N(C<sub>2</sub>H<sub>5</sub>)<sub>4</sub>]<sub>2</sub>[Cu<sub>2</sub>Br<sub>4</sub>], abbreviated (TEA)<sub>2</sub>Cu<sub>2</sub>Br<sub>4</sub>, which features a “molecular salt” structure containing discrete [Cu<sub>2</sub>Br<sub>4</sub>]<sup>2−</sup> anions. This compound, which has an absorption peak at 283 nm, displays a blue, strongly Stokes-shifted emission with a peak at 467 nm. Transient photoluminescence (PL) experiments using broadband emission detection and time-correlated single-photon counting (TCSPC) both find an excited-state lifetime of 57 μs at 296 K. UV–Vis transient absorption experiments at 296 K covering time scales from femto- to microseconds provide evidence for the formation of the T<sub>1</sub> state through intersystem crossing from S<sub>1</sub> with a time constant of 184 ps. The triplet state subsequently decays to S<sub>0</sub> predominantly by phosphorescence. In addition, the time constants for carrier–optical phonon scattering (1.8 ps) and acoustic phonon relaxation (8.3 ns and 465 ns) of (TEA)<sub>2</sub>Cu<sub>2</sub>Br<sub>4</sub> are provided.https://www.mdpi.com/1420-3049/28/23/7841molecular saltshalocupratesultrafast laser spectroscopytriplet emission |
| spellingShingle | Domenic Gust Mirko Scholz Kawon Oum Thomas Lenzer Excited-State Dynamics of Bis(tetraethylammonium) Di-µ-bromo-dibromodicuprate(I) Thin Films Molecules molecular salts halocuprates ultrafast laser spectroscopy triplet emission |
| title | Excited-State Dynamics of Bis(tetraethylammonium) Di-µ-bromo-dibromodicuprate(I) Thin Films |
| title_full | Excited-State Dynamics of Bis(tetraethylammonium) Di-µ-bromo-dibromodicuprate(I) Thin Films |
| title_fullStr | Excited-State Dynamics of Bis(tetraethylammonium) Di-µ-bromo-dibromodicuprate(I) Thin Films |
| title_full_unstemmed | Excited-State Dynamics of Bis(tetraethylammonium) Di-µ-bromo-dibromodicuprate(I) Thin Films |
| title_short | Excited-State Dynamics of Bis(tetraethylammonium) Di-µ-bromo-dibromodicuprate(I) Thin Films |
| title_sort | excited state dynamics of bis tetraethylammonium di µ bromo dibromodicuprate i thin films |
| topic | molecular salts halocuprates ultrafast laser spectroscopy triplet emission |
| url | https://www.mdpi.com/1420-3049/28/23/7841 |
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