The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 28, 2021
Filed:
May. 23, 2019
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
The University of Electro-communications, Chofu, JP;
Taizo Masuda, Yokohama, JP;
Kiyoto Sasaki, Shizuoka-ken, JP;
Shen Qing, Chofu, JP;
Feng Liu, Chofu, JP;
Yaohong Zhang, Chofu, JP;
Chao Ding, Chofu, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota, JP;
THE UNIVERSITY OF ELECTRO-COMMUNICATIONS, Chofu, JP;
Abstract
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.