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AssigneesToyota Jidosha Kabushiki Kaisha, The University of Electro-Communications
InventorsTaizo MASUDA, Kiyoto SASAKI, Shen QING, Feng LIU, Yaohong ZHANG, Chao DING
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There is provided a method of preparing formamidinium lead halide perovskite quantum dots having a photoluminescence quantum yield higher than before. The disclosed method comprises steps of: preparing a lead halide solution by dissolving lead halide (II), oleic acid and oleylamine in a nonpolar solvent; preparing a formamidinium solution by dissolving formamidine acetate salt and oleic acid in a nonpolar solvent; mixing the formamidinium solution and the lead halide solution to form quantum dots; and centrifuging the mixed solution to obtain sediment; dispersing the sediment in a nonpolar solvent to prepare a crude quantum dot solution; mixing the crude quantum dot solution with methyl acetate; and centrifuging the crude quantum dot solution mixed with the methyl acetate to obtain sediment as purified quantum dots. The durable quantum dots are stably formed by injecting the lead halide solution into the formamidinium solution heated at 60° C.-90° C.
A method of preparing formamidinium lead halide perovskite quantum dots, comprising steps of:
The method of claim 6, wherein the formamidinium solution and the lead halide solution are mixed such that a molar ratio of lead ions and formamidinium ions becomes substantially 1:11.25.
A method of preparing formamidinium lead halide perovskite quantum dots, comprising steps of:
Dependencies are inferred from the claim text.