Boosting Blue Emission of Organic Cations in a Sn(IV)-Based Perovskite by Constructing Intermolecular Interactions

Improving the photoluminescence (PL) efficiency of organic
luminescent
molecules is still a great challenge. Herein, a novel zero-dimensional
Sn­(IV)-based halide (C9H8N)2SnCl6 is prepared by assembling inactive quinoline cations and
stable [SnCl6]2– polyhedra. Experimental
characterizations and theoretical calculations show that the blue
emission of (C9H8N)2SnCl6 centered at 433 nm is derived from the organic cations. Surprisingly,
the PL efficiency of the as-prepared halide is nearly 50 times higher
than that of the organic precursor and exhibits ultrahigh stability.
Structural analysis shows that the introduction of inorganic clusters
regulates the stacking mode of organic components and forms hydrogen
bonds. This strong intermolecular interaction enhances the structural
rigidity of (C9H8N)2SnCl6, inhibits concentration quenching and vibrational dissipation, and
thus significantly improves the PL efficiency and stability of the
organic cations. This work provides an important way to improve the
PL performance and stability of organic species by constructing efficient
intermolecular interactions.