Supramolecular-Interactions-Modulated Photoluminescence in Indium Bromide-Based Isomers

Abstract

Here, two isomeric ionic zero-dimensional indium bromide crystals of α (1)/β (2)-[OPy][InBr 4 (Phen)] (OPy = N-octylpyridinium; Phen = 1,10-phenanthroline) have been isolated simply by changing the cooling conditions in solvothermal syntheses. Structural comparisons indicate their different supramolecular interactions, which can be confirmed by Hirshfeld surface analyses. The crystal 2 has additional hydrogen bonds and π−π interactions; as a result, the more compact stacking of 2 could result in a 10fold higher photoluminescence (PL) quantum yield (PLQY) than that of 1. Density functional theory calculations confirm the electron transition from the inorganic moiety to the organic ligand, which provides a further understanding of the optical process. This work provides a new idea for designing PL indiumbased halides by understanding the structure−PL relationship.

A ligand-incorporating strategy towards single-component white light in ionic zero-dimensional indium chlorides

“…In(III)-based IOMHs have received much attention in recent years due to their advantages such as adjustable luminescence, non-toxic, high emission efficiency, and high oxidation resistance. [28][29][30][31][32] For example, Xia's group reported the compound [PMA] 3 InBr 6 (PMA = phenylmethylamine) with strong broadband orange luminescence and a PLQY of 35%. 33 Kuang's group reported on a 0-D (C 4 H 14 N 2 ) 2 In 2 Br 10 (C 4 H 10 N 2 = 2-(dimethylamino)ethylamine) with broadband red emission spanning almost the entire visible spectrum.…”