Perylene containing films

Electrochemical Quartz Crystal Microbalance Studies of the Growth of Perylene-Containing Films... 

In Fig. 15 are shown UV-visible absorption spectra of type a and type b of 15 bilayers consisting of an alternate A-S-D triad-CaT (1 5) and a pure CaT mono-layer and type a of 15 bilayers containing A-S dyads in place of the triads. Hie LB films of type a were deposited on quartz plates, but the LB film of type b on a chemically modified quartz plate by octadecyltrichlorosilane. An absorption peak around 450 nm can be assigned to the acylated perylene moieties for the dyad and... 

Fig. 10 (a) Molecular stmcture of N,iV -bis-(2 -ethylhexyl)perylene-3,4,9,10-tetracarbox-yldiimide (EE-PTCDI). (b) Fluorescence spectra of a LLDPE/EE-PTCDI blend film containing 0.1 wt% EE-PTCDI before and after uniaxial deformation to different draw ratios (Dr), (c) Picture of the same material in which the center portion has been uniaxially deformed to a draw-ratio of 4. The image was taken under excitation with ultraviolet light, (b, c) adapted with permission from [52]. Copyright 2008 American Chemical Society... 

Due to the low mole ratio of dye units present, the above copolymers, with perylene dyes in the main chain or as end groups, show energy transfer only in the solid state. If the dyes are attached on the side chain, then copolymers containing much higher mole ratios of chromophore are accessible. The copolymer 123 (Scheme 57) in which 33% of the fluorene units have dyes attached (m n = 2 1) showed energy transfer in solution as well as in a thin film [224]. The emission colour differed slightly between the two states, with the emission maximum appearing at A,max = 561 nm in solution with a shoulder at 599 nm, and at Xmax = 599 nm in the solid state. This is probably due to interaction of the chromophores in the solid phase. 

Figure 16 shows a SNOM image for PiBMA thin films, containing the labeled PiBMA-Pe polymers with a fraction F = 0.14%, taken with perylene fluorescence intensity under the excitation at 442 nm by a He-Cd laser [26,60]. Several small spots are observed in the picture, although the smface was very flat over the whole area of the topographic images taken at the same time. 

---