Low-dimensional hybrid organic–inorganic metal halides have received increased attention because of their outstanding optical and electronic properties. However, the most studied hybrid compounds contain lead and have long-term stability issues, which must be addressed for their use in practical applications. Here, we report a new zero-dimensional hybrid organic–inorganic halide, RInBr4, featuring photoemissive trimethyl­(4-stilbenyl)­methylammonium (R+) cations and nonemissive InBr4 – tetrahedral anions. The crystal structure of RInBr4 is composed of alternating layers of inorganic anions and organic cations along the crystallographic a axis. The resultant hybrid demonstrates bright-blue emission with Commission Internationale de l’Eclairage color coordinates of (0.19, 0.20) and a high photoluminescence quantum yield (PLQY) of 16.36% at room temperature, a 2-fold increase compared to the PLQY of 8.15% measured for the precursor organic salt RBr. On the basis of our optical spectroscopy and computational work, the organic component is responsible for the observed blue emission of the hybrid material. In addition to the enhanced light emission efficiency, the novel hybrid indium bromide demonstrates significantly improved environmental stability. These findings may pave the way for the consideration of hybrid organic In­(III) halides for light emission applications.

Ionically bonded organic metal halide hybrids have emerged as versatile multicomponent material systems exhibiting unique and useful properties. The unlimited combinations of organic cations and metal halides lead to the tremendous structural diversity of this class of materials, which could unlock many undiscovered properties of both organic cations and metal halides. Here we report the synthesis and characterization of a series benzoquinolinium (BZQ) metal halides with a general formula (BZQ)­Pb2X5 (X = Cl, Br), in which metal halides form a unique two-dimensional (2D) structure. These BZQ metal halides are found to exhibit enhanced photoluminescence and stability as compared to the pristine BZQ halides, due to the scaffolding effects of 2D metal halides. Optical characterizations and theoretical calculations reveal that BZQ+ cations are responsible for the emissions in these hybrid materials. Changing the halide from Cl to Br introduces heavy atom effects, resulting in yellow room temperature phosphorescence (RTP) from BZQ+ cations.

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Upon successful application of the multicomponent approach to oxide systems with a rock salt HEO, 1 the same approach has expanded to other crystal structures including perovskites, 2,3 fluorites, 4-6 and spinels. 7,8 This work furthers the multicomponent approach to the (5RE) 2 CuO 4 Ruddlesden-Popper compound, with five rare earths (RE) on the A-site. The Ruddlesden-Popper (RP) series is generally of the form A n + 1 B n X 3n + 1 , where A and B are cations, X is an anion, and n is the number of the layers of octahedra in the perovskitelike stack. Typically, A is an alkali, alkaline metal, or RE metal ion; and B is a transition metal located inside anionic octahedra, pyramids, or squares. 9 The tetragonal T-structure, shown in Figure 1A, is typically formed for RE = La, while the T′structure, Figure 1B, can be expected for traditional RP n = 1 cuprate compositions of Pr through Gd. The RP phase A 2 BO 4 , having the K 2 NiF 4 structure with space group I4/mmm, has been extensively studied for energy and electronic device applications 10 because of their dielectric, superconducting, and