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Synthesis and optical properties of ordered-vacancy perovskite cesium bismuth halide nanocrystals
R D Nelson1, K Santra2, Y Wang1
1Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, USA. panthani@iastate.
Abstract:
Perovskite-phase cesium bismuth halide (Cs3Bi2X9; X = Cl, Br, I) nanocrystals were synthesized using a hot-injection approach. These nanocrystals adopted ordered-vacancy perovskite crystal structures and demonstrated composition-tunable optical properties. Growth occurred by initial formation of Bi0 seeds, and morphology was controlled by precursor and seed concentration. The Cs3Bi2I9 nanocrystals demonstrated excellent stability under ambient conditions for several months. Contrary to previous reports, we find that photoluminescence originates from the precursor material as opposed to the Cs3Bi2X9 nanocrystals.
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