US 12,221,574 B2
Core-shell semiconductor nanoparticles, production method thereof, and light-emitting device
Susumu Kuwabata, Ibaraki (JP); Taro Uematsu, Suita (JP); Kazutaka Wajima, Toyonaka (JP); Tsukasa Torimoto, Nagoya (JP); Tatsuya Kameyama, Nagoya (JP); and Daisuke Oyamatsu, Tokushima (JP)
Assigned to OSAKA UNIVERSITY, Osaka (JP); National University Coporation Tokai National Higher Education and Research System, Nagoya (JP); and NICHIA CORPORATION, Anan (JP)
Appl. No. 16/970,273
Filed by OSAKA UNIVERSITY, Osaka (JP); National University Corporation Tokai National Higher Education and Research System, Nagoya (JP); and NICHIA CORPORATION, Anan (JP)
PCT Filed Feb. 15, 2019, PCT No. PCT/JP2019/005610
§ 371(c)(1), (2) Date Aug. 14, 2020,
PCT Pub. No. WO2019/160093, PCT Pub. Date Aug. 22, 2019.
Claims priority of application No. 2018-025409 (JP), filed on Feb. 15, 2018.
Prior Publication US 2021/0040385 A1, Feb. 11, 2021
Int. Cl. C09K 11/62 (2006.01); B82Y 20/00 (2011.01); B82Y 40/00 (2011.01); H01L 33/50 (2010.01)
CPC C09K 11/621 (2013.01) [H01L 33/502 (2013.01); B82Y 20/00 (2013.01); B82Y 40/00 (2013.01)] 14 Claims
OG exemplary drawing
 
1. Core-shell semiconductor nanoparticles, each comprising:
a core; and
a shell disposed on a surface of the core, and emitting light when irradiated with light,
wherein the core consists of a semiconductor having a composition represented by the formula M1M2Z2, M1 being Ag, M2 consisting of at least one selected from the group consisting of Ga and In, and Z consisting of at least one selected from the group consisting of S and Se,
the shell contains a semiconductor consisting of Ga and S, and having a greater band-gap energy than the core, and
a compound containing a Group 15 element is disposed on an outer surface of the shell, the Group 15 element containing at least P with a negative oxidation number, and
wherein the core has a chalcopyrite-type crystal structure,
wherein the compound containing the Group 15 element is a shell surface modifier having a hydrocarbon group with a carbon number of from 4 to 20.