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- W4249293057 abstract "Thin films of 5,11-dicyano-6,12-diphenyltetracene (TcCN) have been studied for their ability to undergo singlet exciton fission (SF). Functionalization of tetracene with cyano substituents yields a more stable chromophore with favorable energetics for exoergic SF (2E(T1)−E(S1)=−0.17 eV), where S1 and T1 are singlet and triplet excitons, respectively. As a result of tuning the triplet-state energy, SF is faster in TcCN relative to the corresponding endoergic process in tetracene. SF proceeds with two time constants in the film samples (τ=0.8±0.2 ps and τ=23±3 ps), which is attributed to structural disorder within the film giving rise to one population with a favorable interchromophore geometry, which undergoes rapid SF, and a second population in which the initially formed singlet exciton must diffuse to a site at which this favorable geometry exists. A triplet yield analysis using transient absorption spectra indicates the formation of 1.6±0.3 triplets per initial excited state." @default.
- W4249293057 created "2022-05-12" @default.
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- W4249293057 date "2015-06-10" @default.
- W4249293057 modified "2023-10-18" @default.
- W4249293057 title "Sub-Picosecond Singlet Exciton Fission in Cyano-Substituted Diaryltetracenes" @default.
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- W4249293057 doi "https://doi.org/10.1002/ange.201501355" @default.
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