US 11,667,834 B2
Method for manufacturing light emitting element including quantum dot in an emission layer
Changhee Lee, Seoul (KR); Sehun Kim, Yongin-si (KR); Hyojin Ko, Seoul (KR); Dukki Kim, Suwon-si (KR); Jaehoon Kim, Seoul (KR); Hyunmi Doh, Seoul (KR); Yunku Jung, Cheonan-si (KR); and Jaekook Ha, Seoul (KR)
Assigned to Samsung Display Co., Ltd., Yongin-si (KR)
Filed by Samsung Display Co., Ltd., Yongin-si (KR)
Filed on Mar. 11, 2021, as Appl. No. 17/198,752.
Claims priority of application No. 10-2020-0066729 (KR), filed on Jun. 2, 2020.
Prior Publication US 2021/0371732 A1, Dec. 2, 2021
Int. Cl. H10K 50/115 (2023.01); H10K 71/00 (2023.01); C09K 11/02 (2006.01); H01L 51/50 (2006.01); H01L 51/56 (2006.01); B82Y 40/00 (2011.01); B82Y 20/00 (2011.01)
CPC C09K 11/025 (2013.01) [H01L 51/502 (2013.01); H01L 51/56 (2013.01); B82Y 20/00 (2013.01); B82Y 40/00 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of manufacturing a light emitting element, the method comprising:
forming a first electrode;
forming a hole transport region on the first electrode;
forming an emission layer on the hole transport region;
forming an electron transport region on the emission layer; and
forming a second electrode on the electron transport region,
wherein the forming of the emission layer comprises:
providing a quantum dot composition, comprising a quantum dot and a ligand bonded to a surface of the quantum dot, to form a preliminary emission layer; and
increasing a layer density of the preliminary emission layer by about 5% or greater, and
wherein the ligand comprises:
a head portion bonded to the surface of the quantum dot; and a tail portion comprising at least one radical reactive group,
a head portion bonded to the surface of the quantum dot; a connecting portion connected to the head portion and comprising a metal; and a tail portion coordinated to the metal of the connecting portion, or
a head portion bonded to the surface of the quantum dot and comprising an ion bond material or a polar solvent dissociative functional group; and a tail portion connected to the head portion.