US 12,310,164 B2
Light-emitting element including luminous quantum dots and non-luminous quantum dots, display device including light-emitting element thereof, and method of manufacturing light- emitting element thereof
Yoshihiro Ueta, Sakai (JP)
Assigned to SHARP KABUSHIKI KAISHA, Sakai (JP)
Appl. No. 17/602,996
Filed by SHARP KABUSHIKI KAISHA, Sakai (JP)
PCT Filed Apr. 12, 2019, PCT No. PCT/JP2019/015979
§ 371(c)(1), (2) Date Oct. 11, 2021,
PCT Pub. No. WO2020/208810, PCT Pub. Date Oct. 15, 2020.
Prior Publication US 2022/0115613 A1, Apr. 14, 2022
Int. Cl. H10K 50/115 (2023.01); H10K 59/122 (2023.01); H10K 71/00 (2023.01); H10K 71/40 (2023.01); H10K 102/00 (2023.01)
CPC H10K 50/115 (2023.02) [H10K 71/00 (2023.02); H10K 59/122 (2023.02); H10K 71/40 (2023.02); H10K 2102/321 (2023.02); H10K 2102/351 (2023.02)] 10 Claims
OG exemplary drawing
 
1. A light-emitting element comprising, on a substrate:
a positive electrode;
a negative electrode;
a quantum-dot layer between the positive electrode and the negative electrode, the quantum-dot layer including a stack of a plurality of luminous first quantum dots and a plurality of non-luminous second quantum dots;
a hole transport layer between the positive electrode and the quantum-dot layer; and
an electron transport layer between the negative electrode and the quantum-dot layer, wherein
a majority of second quantum dots in the plurality of second quantum dots are in an electron transport layer side compared to a hole transport layer side,
each of the plurality of first quantum dots has a first ligand on an outermost layer thereof,
each of the plurality of second quantum dots has a second ligand on an outermost layer thereof, and
the first ligand includes a number of carbon atoms per molecule that is equal to a number of carbon atoms per molecule in the second ligand.