2024-03-29T09:38:13Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/752692022-11-17T02:08:08Zhdl_2115_20057hdl_2115_148Mixed-halide perovskite synthesis by chemical reaction and crystal nucleation under an optical potentialIslam, Md JahidulYuyama, Ken-ichiTakahashi, Kiyonori1000060270790Nakamura, TakayoshiKonishi, KatsuakiBiju, Vasudevanpillaimetadata only accessCreative Commons Attribution 4.0 International425The development of new methods to engineer lead halide perovskite crystals with a controlled band gap and emission properties is an active subject in materials science and chemistry. We present the preparation of mixed-halide lead perovskites by spatially- and temporally- controlled chemical reactions and crystal growth under an optical potential in unsaturated precursor solutions. The crystals are characterized by transmission and photoluminescence spectral measurements and X-ray diffraction analysis. When compared with the spontaneous formation of multiple crystals in saturated precursor solutions, the optical potential creates large single crystals with a high chloride composition, providing distinct blue and green fluorescent crystals of chloride-bromide lead perovskites. We discuss the formation of mixed-halide perovskites from the viewpoints of an increased rate of chemical reaction via the formation and desolvation of precursor complexes and a decreased free energy potential.Nature Publishing Group2019-06-28engjournal articleNAhttp://hdl.handle.net/2115/75269https://doi.org/10.1038/s41427-019-0131-01884-4049NPG Asia materials1131