title: Spectral image adaptation and visual experience of DBA/PMMA.
abstract: High resolution S0-->Sn and T1-->Tn electronic absorptions and B-type delayed fluorescence of 1,2,7,8-dibenzanthracene in polymethylmethacrylate (PMMA) were experimentally observed by flash and laser flash photolysis technique. Dibenzanthracene (hereafter DBA) molecules were excited in a two-step process. In the first step, an excited singlet is created, which undergoes intersystem crossing to triplet state, then T-T absorption creates an excited triplet dibenzanthracene molecule, which returns to the first excited singlet level by intersystem crossing. The re-created first excited singlet of dibenzanthracene decays back to the ground state by emitting B-type of delayed fluorescence, which was observed at the same emission band of prompt (normal) fluorescence, and R-, E-, P-types of delayed fluorescences. For normal fluorescence, S1 state is decaying to S0 ground state. For E- and P-type of delayed fluorescences, T1 state is decaying to S0 via S1 state, and for B-type of delayed fluorescence, T2 state is decaying to S0 via S1 state. The spectrum image showing the absorption/emission bands mentioned was also examined by image processing techniques in order to improve the visual experience of each band by localizing to a specific region of interest (ROI). Experimental results illustrate how the exact location of emission/absorption bands was clearly extracted from the spectral image and further improvements in the visual detection of absorption/emission bands.
authors.affiliation: Department of Electronics Engineering, Yeditepe University, Istanbul 34755, Turkey. fubay@yeditepe.edu.tr
authors.forename: Fuat
authors.initials: F
authors.lastname: Bayrakçeken
authors.forename: Fikret
authors.initials: F
authors.lastname: Ari
authors.forename: Ziya
authors.initials: Z
authors.lastname: Telatar
mesh_terms: D001551:Benz(a)Anthracenes / Q000737:chemistry*; D006801:Humans; D055095:Optics and Photonics; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D013057:Spectrum Analysis; D014785:Vision, Ocular / Q000502:physiology*
chemical_list: D001551:Benz(a)Anthracenes; C016365:dibenzanthracenes; D019904:Polymethyl Methacrylate