Optical spectra obtained from amorphous films of rubrene: Evidence for predominance of twisted isomer
In order to investigate the optical properties of rubrene we study the vibronic progression of the first absorption band (lowest \pi -> \pi^* transition). We analyze the dielectric function of rubrene in solution and thin films using the displaced harmonic oscillator model and derive all relevant...
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| creator | Kytka, M Gisslen, L Gerlach, A Heinemeyer, U Kovac, J Scholz, R Schreiber, F |
| description | In order to investigate the optical properties of rubrene we study the vibronic progression of the first absorption band (lowest \pi -> \pi^* transition). We analyze the dielectric function of rubrene in solution and thin films using the displaced harmonic oscillator model and derive all relevant parameters of the vibronic progression. The findings are supplemented by density functional calculations using B3LYP hybrid functionals. Our theoretical results for the molecule in two different conformations, i.e. with a twisted or planar tetracene backbone, are in very good agreement with the experimental data obtained for rubrene in solution and thin films. Moreover, a simulation based on the monomer spectrum and the calculated transition energies of the two conformations indicates that the thin film spectrum of rubrene is dominated by the twisted isomer. |
| doi_str_mv | 10.48550/arxiv.0905.2689 |
| format | Article |
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We analyze the dielectric function of rubrene in solution and thin films using the displaced harmonic oscillator model and derive all relevant parameters of the vibronic progression. The findings are supplemented by density functional calculations using B3LYP hybrid functionals. Our theoretical results for the molecule in two different conformations, i.e. with a twisted or planar tetracene backbone, are in very good agreement with the experimental data obtained for rubrene in solution and thin films. 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| subjects | Absorption spectra Computer simulation Harmonic oscillators Optical properties Physics - Soft Condensed Matter Thin films |
| title | Optical spectra obtained from amorphous films of rubrene: Evidence for predominance of twisted isomer |
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