Enhanced S sub(2) emission in carbazole-based ionic liquids
Ionic liquids composed of a carbazoleimidizolium-based cation and various hydrophobic anions have been synthesized and characterized. Analyses of the absorption spectra of these compounds indicate significant increases in energy gaps between the first two excited singlet states, which results in inh...
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| Veröffentlicht in: | RSC advances 2015-01, Vol.5 (13), p.9939-9945 |
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| container_issue | 13 |
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| container_title | RSC advances |
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| creator | Siraj, Noureen Das, Susmita Hasan, Farhana Lu, Chengfei Kiruri, Lucy W Steege Gall, Karen E Warner, Isiah M |
| description | Ionic liquids composed of a carbazoleimidizolium-based cation and various hydrophobic anions have been synthesized and characterized. Analyses of the absorption spectra of these compounds indicate significant increases in energy gaps between the first two excited singlet states, which results in inhibition of internal conversion from the S sub(2) to S sub(1) states. Detailed studies of the spectral properties of these compounds support emission from multiple excited states including possible emission from the second excited singlet state (S sub(2) emission) in combination with an intramolecular charge transfer state. This conclusion is also consistent with fluorescence lifetime data, which suggest fluorescence emission from multiple electronic excited states. In addition, theoretical calculations of the excited states support these conclusions. |
| doi_str_mv | 10.1039/c4ra12362j |
| format | Article |
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Analyses of the absorption spectra of these compounds indicate significant increases in energy gaps between the first two excited singlet states, which results in inhibition of internal conversion from the S sub(2) to S sub(1) states. Detailed studies of the spectral properties of these compounds support emission from multiple excited states including possible emission from the second excited singlet state (S sub(2) emission) in combination with an intramolecular charge transfer state. This conclusion is also consistent with fluorescence lifetime data, which suggest fluorescence emission from multiple electronic excited states. 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Analyses of the absorption spectra of these compounds indicate significant increases in energy gaps between the first two excited singlet states, which results in inhibition of internal conversion from the S sub(2) to S sub(1) states. Detailed studies of the spectral properties of these compounds support emission from multiple excited states including possible emission from the second excited singlet state (S sub(2) emission) in combination with an intramolecular charge transfer state. This conclusion is also consistent with fluorescence lifetime data, which suggest fluorescence emission from multiple electronic excited states. In addition, theoretical calculations of the excited states support these conclusions.</abstract><doi>10.1039/c4ra12362j</doi></addata></record> |
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| ispartof | RSC advances, 2015-01, Vol.5 (13), p.9939-9945 |
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| source | Royal Society Of Chemistry Journals 2008- |
| subjects | Emission Emission analysis Energy gap Excitation Excitation spectra Fluorescence Ionic liquids Mathematical analysis Spectral emissivity |
| title | Enhanced S sub(2) emission in carbazole-based ionic liquids |
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