Zero-Dimensional Organic–Inorganic Hybrid Indium Chlorides with Intrinsic Blue Light Emissions

Considering low photoluminescence quantum yield (PLQY < 5%) of blue emissive CsPbCl3 bulk crystal and the high toxicity of Pb2+, it is significant to explore new single crystalline lead-free perovskites with highly efficient blue light emission. Herein, two new zero-dimensional (0D) hybrid indium halides of [H2EP]2InCl6·Cl·H2O·C3H6O and [H3AEP]InCl6··H2O (EP = 1-ethylpiperazine, AEP = N-aminoethyl piperazine) were prepared. Remarkably, these 0D indium halides display unusual blue light emissions (about 430 nm) with a highest PLQY of 13.44%. To the best of our knowledge, this work represents one of the first higher energy blue light emitters in hybrid indium perovskites, which would advance the research on lead-free hybrid halides for next-generation luminescent materials.