Estimation of the fluorescence lifetime for optically inaccessible exciplexes in nonpolar solutions under ionizing irradiation
| Autor: | Evgeny V. Kalneus, Dmitri V. Stass, V.I. Borovkov, Valeri V. Korolev, Anatoly R. Melnikov, Peter S. Sherin |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Naphthalenes
010402 general chemistry Excimer Photochemistry 01 natural sciences Molecular physics Fluorescence chemistry.chemical_compound Terphenyl Compounds 0103 physical sciences Alkanes Irradiation Physical and Theoretical Chemistry Anthracenes Range (particle radiation) Quenching (fluorescence) Aniline Compounds 010308 nuclear & particles physics Acetylene X-Rays Photochemical Processes 0104 chemical sciences Oxygen Solutions Kinetics chemistry Excited state Luminophore Luminescence |
| Zdroj: | Photochemicalphotobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology. 15(6) |
| ISSN: | 1474-9092 |
| Popis: | X-irradiation of nonpolar solutions likely provides a possibility to create exciplexes for any donor–acceptor pair that would energetically and sterically allow this. Thorough study and characterization of X-radiation generated exciplexes usually cannot be carried out with conventional methods because of the complex and non-exponential formation and decay dynamics of these species. In this paper, we present a simple and universal experimental approach for the estimation of fluorescence lifetimes (τF) of X-radiation generated exciplexes. The suggested procedure is based on the comparison of quenching of the exciplex emission band and the emission band from a standard luminophore with a known excited state lifetime by dissolved oxygen. Using this approach we report the τF values for two systems with optically inaccessible exciplexes, diphenylacetylene–N,N-dimethylaniline (DMA) and p-terphenyl–DMA, and for two typical exciplex forming systems, naphthalene–DMA and anthracene–DMA. All the found τF values for the X-radiation generated exciplexes lie in the range of 50–70 ns. The accuracy of this approach was checked by time-resolved measurements under X- or near-UV irradiation for those pairs, whose properties make this feasible. The proposed method gives a possibility to avoid a complex numerical evaluation of the non-exponential kinetics of recombination luminescence, and can be used to estimate the characteristic τF values for luminophores and excited complexes formed under X-radiation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink