White-light emission from a single heavy atom-free molecule with room temperature phosphorescence, mechanochromism and thermochromism.

ABSTRACT: Two heavy atom-free luminophores (SHB₂t and SDB₂t) with simple molecular structures have been synthesized via Suzuki coupling reactions in which both display white-light emission with prompt fluorescence and room temperature phosphorescence (RTP) in the solid state. The impressive RTP of the luminophores is produced by a synergistic effect of the strong intermolecular hydrogen bonding in addition to the spin-orbit coupling of the sulfonyl oxygen atoms and the moderate singlet-triplet energy gaps (ΔE_ST). These factors facilitate the intersystem crossing (ISC) process to generate triplet excitons in which the molecular conformations become immobilized to effectively suppress radiationless decay. Under the stimuli of mechanical force and solvent

SUBMITTER: Xu B 

PROVIDER: S-EPMC5430137 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature