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Organic metal halide hybrids with zero-dimensional (0D) structure at the molecular level, or single-crystalline bulk assemblies of metal halides, are an emerging class of light-emitting materials with high photoluminescence quantum efficiencies (PLQEs) and color tunability. Here we report the synthesis and characterization of a new single-crystalline bulk assembly of metal halide clusters, (bmpy)9ZnCl42Pb3Cl11 (bmpy: 1-butyl-1-methylpyrrolidinium), which exhibits green emission peaked at 512 nm with a remarkable near-unity PLQE at room temperature. Detailed structural and photophysical studies suggest that there are two emitting states in Pb3Cl115– clusters, whose populations are strongly dependent on the surrounding molecular environment that controls the excited-state structural distortion of Pb3Cl115– clusters. High chemical- and photostability have also been demonstrated in this new material.
Zhou et al. (Tue,) studied this question.