US 11,935,984 B2
Semiconductor nanocrystal particle, method for preparing same, and device including same
Yong Seok Han, Anyang-si (KR); Sung Woo Kim, Hwaseong-si (KR); Jin A Kim, Suwon-si (KR); Tae Hyung Kim, Seoul (KR); Kun Su Park, Seongnam-si (KR); Yuho Won, Seoul (KR); Jeong Hee Lee, Seongnam-si (KR); Eun Joo Jang, Suwon-si (KR); and Hyo Sook Jang, Suwon-si (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Gyeonggi-Do (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed on Dec. 14, 2022, as Appl. No. 18/065,910.
Application 18/065,910 is a division of application No. 16/998,262, filed on Aug. 20, 2020, granted, now 11,563,143.
Claims priority of application No. 2019-0107637 (KR), filed on Aug. 30, 2019.
Prior Publication US 2023/0114604 A1, Apr. 13, 2023
Int. Cl. H01L 33/06 (2010.01); C01B 19/04 (2006.01); C09K 11/88 (2006.01); H01L 33/20 (2010.01); H01L 33/26 (2010.01)
CPC H01L 33/06 (2013.01) [C01B 19/04 (2013.01); C09K 11/88 (2013.01); H01L 33/20 (2013.01); H01L 33/26 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for preparing a core-shell quantum dot, comprising providing a core comprising a first semiconductor nanocrystal comprising zinc and selenium, and optionally sulfur and/or tellurium,
providing (i) a first solution comprising zinc-carboxylate, a fluorine ion source, and a solvent, or (ii) a second solution comprising ZnF2 and a solvent,
adding the core to the first solution or the second solution to provide a first core solution or a second core solution, respectively, and
adding at least one of a sulfur-containing precursor or a selenium-containing precursor, to the first core solution or the second core solution, and allowing the core solutions to react,
wherein the core-shell quantum dot has an average particle diameter of greater than or equal to about 13 nanometers, an emission peak wavelength in a range of about 440 nanometers to about 470 nanometers, and a full width at half maximum (FWHM) of an emission wavelength of less than about 25 nanometers, and
the core-shell quantum dot exhibits a quantum efficiency of greater than or equal to about 70%, and the core-shell quantum dot is cadmium-free.