Abstract
The twisted molecule, TATPO, which exhibited dual emissions of fluorescence (FL) and room-temperature phosphorescence (RTP) in both crystal types, were designed, synthesized and characterized. The dual-emissive bands were combined by fluorescence (ca. 439 nm) and phosphorescence (ca. 514 nm). Intriguingly, these two kinds of luminescence ratios (FL and RTP) can be tunable by external stimuli, such as grinding or fuming. Experimental and theoretical studies have shown that twisted molecular structure and the folded dihedral angle of thianthrene can promote spin-orbit coupling (SOC) and thus enhance phosphorescence. In addition, the folded dihedral angle of thianthrene group is the main reason that this molecule could realize tunable luminescence between FL and RTP. This work not only described a twisted molecule for pure organic multifunctional materials with mechanochromic luminescence properties, but also provided a novel strategy to design stimuli-responsive materials with tunable FL/RTP ratios.
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