Zero-dimensional indium hybrids and modulated photoluminescence by Sb doping

Zero-dimensional (0D) indium hybrids have been recently explored as promising platforms for use in solid-state lighting owing to their environmental friendliness and stability. Herein, we first designed a novel 0D indium hybrid (TEA)(2)InCl5 (tetraethylammonium(+), C8NH20+), where the organic cation (TEA)(+) cocrystallizes with five-coordinated [InCl5](2-) square pyramids. Experimental data and first-principles calculations reveal that the blue emissions are attributed to the organic cations (TEA)(+) and self-trapped excitons (STEs) in the inorganic [InCl5](2-) square pyramids. Remarkably, when incorporating Sb3+ ions, the value of photoluminescence quantum yield (PLQY) is greatly enhanced to 78.85%, and the emission color could be tuned from blue to warm white and finally to orange-red. This success of (TEA)(2)InCl5 : Sb3+ not only enriches the structure and optical properties of 0D indium hybrids, but also provides a new direction towards modulating the optical performance through a doping strategy.