Emission properties of Si-based styryl-carbazole derivatives: Role of meta- and para-vinyl substituents and silicon atom

Rachuta, Karolina; Bayda-Smykaj, Małgorzata; Majchrzak, Mariusz; Koput, Jacek; Marciniak, Bronisław

doi:10.1016/j.jlumin.2017.12.007

Cited by 4 publications

(2 citation statements)

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“…In DCM (likewise in THF, see Supporting Information), compound 1 showed a strong (Φ f = 0.64), single broad fluorescence band with a maximum at 402 nm, which tends to show a red shift with the increase in solvent polarity. A similar behavior has already been reported for compound 1a in our previous studies , and is considered to be originating from an ICT state. In this state, the electron density moves toward the styryl part of the styrylcarbazole .…”

Section: Resultssupporting

confidence: 89%

“…What is important is that the solvent affects only the emission and not the absorption properties (see Figure S1, Supporting Information), and therefore, the environment plays an important role only in the excited states of compound 1 . To understand the photoinduced processes responsible for the emission of compound 1 , all of the results presented below were analyzed with reference to the single-chromophoric subunits 1a , and 1b in the respective solvents. Although this work focuses on white-light emission observed in acetonitrile, the results in hexane and dichloromethane are also presented here for a better understanding.…”

Section: Resultsmentioning

confidence: 99%

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White Light from Dual Intramolecular Charge-Transfer Emission in a Silylene-Bridged Styrylcarbazole and Pyrene Dyad

et al. 2021

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Styrylcarbazole linked to pyrene by a dimethylsilyl bridge was synthesized in the search for new charge-transfer active materials for LED applications. In the course of a photophysical study, it turned out that such a donor-bridge-acceptor compound displayed three completely different types of emission depending on solvent polarity. The most attractive emission properties were found in acetonitrile in which two broad emission bands were observed. The resolved mechanism of the excited-state processes in acetonitrile was supported by singular value decomposition with self-modeling treatment of time-resolved emission spectra (ns-TCSPC). The data analysis revealed that there were two excited-state processes, that is, charge transfer within styrylcarbazole and electron transfer from styrylcarbazole to pyrene through a silylene bridge that was responsible for a broad dual emission. The general idea of designing compounds that display emission from more than one excited state covering a wide range of the visible spectrum can be a powerful tool in designing new white-light-emitting materials.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%