![]() ![]() Publication Date: Mon Apr 04 00:00: Research Org.: Argonne National Lab. Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Derio (Spain) Basque Foundation for Science, Bilbao (Spain).Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Derio (Spain).of Illinois, Chicago, IL (United States) Illinois Institute of Technology, Chicago, IL (United States) Altogether, these results provide valuable guidance in the design of triplet donor–acceptor dyads, which could be used for more » light-harvesting/modulation applications. But, it was found that a maximum upconversion quantum yield could be achieved at a low power density using the co-facial type dyad 5. Subsequently, triplet sensitization of 9,10-diphenylanthracene (DPA) using both dyads led to upconverted photoluminescence via triplet–triplet annihilation of DPA triplet transients. Further analysis of the TA data suggests that the dyad with slip-stack geometry (4) is less effective in undergoing both intra- and inter-dyad triplet energy transfer than the dyad with co-facial geometry (5). ![]() However, the kinetics of the excited-state processes/dynamics is significantly influenced by the geometrical arrangement(s) of donor/acceptor chromophores. ![]() While the optical absorption and emission profiles of these new systems exhibit similar spectral structures as that of the triplet donor/sensitizer quinoidal thioamide (QDN), the transient absorption (TA) spectra of these two dyads produced new features that can be associated with triplet transients and charge transfer species. In this report, two novel triplet D–A dyads (4 and 5) were synthesized and fully characterized. We report the design/synthesis and characterization of organic donor–acceptor (D–A) dyads can provide precious data allowing to improve the efficiency of classical photo-induced bimolecular interactions/processes. ![]()
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