Analysis of spectra and properties for 9,10-bis(phenylethynyl)anthracene
In order to perfectly characterize the photophysical properties of 9,10-bis(phenylethynyl)anthracene(BPEA),which is an excellent fluorescent material,the spectra of BPEA in different systems were investigated by using steady-state absorption and fluorescence spectra,time-resolved fluorescence spectra,and experimental and theoretical Raman spectra.Importantly,the steady-state absorption and fluorescence spectra revealed the strong intermolecular interaction and very low fluorescence quantum yield(fluorescence quenching)caused by BPEA molecular aggregation.The characteristics of the large proportion of decay components and long fluorescence lifetime in the time-resolved fluorescence spectra revealed that the excited state of BPEA/Film system undergoes a non-radiative deactivation mechanism involved with the singlet fission(SF)or charge recombination.The Raman vibration modes of BPEA molecules were calibrated and identified by comparing results of the experimental Raman spectroscopy and density functional theory calculations.Meanwhile,compared with the BPEA/nHX and BPEA/THF solution systems,the BPEA/Film system has the characteristics of significant broadening,large redshift and complex vibration structure.It can be concluded from the results that the investigations provide a fundamental basis for further understanding of the changes in spectral structure and molecular vibration structure for BPEA during the SF and triplet-triplet annihilation(TTA)processes.
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