Intrinsic intermolecular photoinduced charge separation in organic radical semiconductors.

ABSTRACT: Organic radicals based on tris(2,4,6-trichlorophenyl)methyl (TTM) radicals show efficient photoluminescence from excitons in the spin-doublet manifold, but their potential in charge photogeneration remains unexplored. Here we report that when TTMs are in contact, photoexcitation generates TTM anion-TTM cation pairs. These can decay radiatively or be fully separated under an electric field bias. We use a triphenyl-substituted TTM (P₃TTM) in which the phenyl end groups enhance intermolecular interactions. In dilute (5 wt%) films in a wide-energy-gap organic semiconductor host, we observe prompt photoluminescence from the excited radical at 645 nm, and a delayed component, beyond 1 μs, at 800 nm due to recombination of P₃TTM anion-cation pairs. Measurements of photocurre

SUBMITTER: Li B 

PROVIDER: S-EPMC12747885 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature