Luminescence Based on Through-Space Electronic Interactions

Organic luminescent materials have traditionally relied on through-bond conjugation (TBC) within rigid structures to enforce efficient π-electron delocalization, resulting in high fluorescence quantum yield and adjustable emission wavelength. However, the emerging efficient luminescence from non-conjugated structures suggests that TBC is not essential for constructing luminophores, leaving the emission mechanism unclear.

Recently, our group developed a series of non-conjugated luminescent multiarylalkanes and highlighted the important role of weak interactions in luminescence, referred to as through-space electronic interaction (also known as through-space conjugation, TSC). We have gradually established the structure-property relationship for TSC. Furthermore, photophysical studies on π-conjugated twisted luminophores suggest that TSC coexists in these structures and likely plays a more significant role than TBC in their luminescent properties.

We anticipate that these findings will pave the way for a new understanding of photophysics based on weak interactions.

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