US 12,460,129 B2
Rare earth complex-containing composition and fluorescent penetrant inspection method using same
Hiroki Iwanaga, Kanagawa (JP); Shinji Saito, Kanagawa (JP); Rei Hashimoto, Tokyo (JP); Toshitake Kitagawa, Kanagawa (JP); Kei Kaneko, Kanagawa (JP); and Tsutomu Kakuno, Kanagawa (JP)
Assigned to KABUSHIKI KAISHA TOSHIBA, Tokyo (JP)
Filed by KABUSHIKI KAISHA TOSHIBA, Tokyo (JP)
Filed on Mar. 15, 2022, as Appl. No. 17/695,647.
Claims priority of application No. 2021-077842 (JP), filed on Apr. 30, 2021.
Prior Publication US 2022/0363985 A1, Nov. 17, 2022
Int. Cl. C09K 11/06 (2006.01); C09K 11/02 (2006.01); G01N 21/91 (2006.01)
CPC C09K 11/06 (2013.01) [C09K 11/025 (2013.01); G01N 21/91 (2013.01); C09K 2211/182 (2013.01)] 11 Claims
 
1. A rare earth complex-containing composition comprising a rare earth complex comprising:
a rare earth ion;
two or more phosphine oxide ligands having different structures; and
a β-diketone ligand,
the rare earth complex being dissolved in a fluorine-based solvent,
wherein the fluorine-based solvent is hydrofluoroether.