ArticleAdvanced science (Weinheim, Baden-Wurttemberg, Germany)2026
Aggregation-Controlled Triplet Exciton Regulation Enables Single-Emitter Color-Evolving Afterglow.
Article in Advanced science (Weinheim, Baden-Wurttemberg, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Aggregation plays a crucial role in regulating excited-state processes in organic luminescent materials, yet the simultaneous control of delayed fluorescence (DF) and room-temperature phosphorescence (RTP) remains challenging. Herein, a series of dithienopyrrole-based luminophores (DTP-R) are developed as a single-emitter system to investigate aggregation-regulated excited-state dynamics. By tuning the doping concentration in poly(methyl methacrylate) (PMMA), the emission evolves from monomer-like to aggregate-dominated states, accompanied by a continuous red shift of both prompt fluorescence (PF) and DF, as well as the coexistence of DF and RTP in the delayed spectra. Structural analysis reveals that aggregation is governed by cooperative weak intermolecular interactions, particularly S⋯π interaction, rather than conventional π-π stacking. Theoretical calculations suggest that aggregation induces intermolecular charge separation, reduces the singlet-triplet energy gap (ΔE
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