White Light\nEmission in Zero-Dimensional Indium Hybrid\nwith Hydrogen Bond

Low-dimensional organic–inorganic metal halides\n(OIMHs)\nhave been explored as single-component white light emitters for applications\nin solid-state lighting. Herein, we report a zero-dimensional (0D)\nIn-based OIMH (TMPDA)[InCl<sub>5</sub>(H<sub>2</sub>O)] (TMPDA = <i>N,N,N′,N’</i>-tetramethyl-1,4-phenylenediamine),\nwhich crystallizes in the noncentrosymmetric <i>P</i>2<sub>1</sub>2<sub>1</sub>2<sub>1</sub> space group and contains hydrogen\nbonds between the adjacent [InCl<sub>5</sub>(H<sub>2</sub>O)]<sup>2–</sup> octahedra in structure. It exhibits a large optical\nband gap (4.10 eV) and dual-band emission under UV light. Spectroscopic\nanalysis and theoretical calculation indicate that the high (404 nm)-\nand low (513 nm)-energy emissions are attributed to the bound excitons\nin organic ligands and self-trapped excitons in [InCl<sub>5</sub>(H<sub>2</sub>O)]<sup>2–</sup> units, respectively. It is found that\nSb doping in this 0D hybrid provides additional orange (590 nm) emission\nassigned to the <sup>3</sup>P<sub>1</sub> → <sup>1</sup>S<sub>0</sub> triplet radiative recombination. By adjusting the doping\nlevel, the emission color can be turned from turquoise to orange,\nand interestingly, a single-component white-light emission is realized\nby balancing the high-energy emission from organic ligand, the turquoise\nemission from [InCl<sub>5</sub>(H<sub>2</sub>O)]<sup>2–</sup>, and the orange one from [SbCl<sub>5</sub>(H<sub>2</sub>O)]<sup>2–</sup>. This work not only provides a new OIMH showing the\nsingle-component white light emission but also demonstrates the potential\nof In-based hybrids with hydrogen bonds for solid-state luminescence.