US 12,414,427 B2
Light-emitting element comprising quantum dots, display device including the same, and manufacturing method of the light-emitting element
Yunku Jung, Cheonan-si (KR); and Hyekyoung Choi, Hwaseong-si (KR)
Assigned to Samsung Display Co., Ltd., Yongin-si (KR)
Filed by Samsung Display Co., Ltd., Yongin-si (KR)
Filed on Oct. 6, 2021, as Appl. No. 17/450,130.
Claims priority of application No. 10-2021-0000381 (KR), filed on Jan. 4, 2021.
Prior Publication US 2022/0216441 A1, Jul. 7, 2022
Int. Cl. H10K 50/115 (2023.01); H10K 50/15 (2023.01); H10K 71/00 (2023.01); H10K 71/40 (2023.01)
CPC H10K 50/115 (2023.02) [H10K 50/15 (2023.02); H10K 71/40 (2023.02)] 12 Claims
OG exemplary drawing
 
1. A light-emitting element comprising:
a first electrode;
a light-emitting layer on the first electrode and comprising quantum dots;
a hole transport region between the first electrode and the light-emitting layer and comprising a first portion adjacent to the light-emitting layer, the first portion consisting of a hole transport material and quantum dots the same as those comprised in the light-emitting layer, and the first portion having a concentration gradient which is a distribution density of the quantum dots decreasing from a portion of the first portion adjacent to the light-emitting layer to a portion of the first portion further away from the light-emitting layer;
an electron transport region on the light-emitting layer; and
a second electrode on the electron transport region,
wherein an interface is defined between the light-emitting layer and the hole transport region, and
the hole transport material is selected from the group consisting of a compound represented by Formula H-1, a phthalocyanine compound, N,N′-diphenyl-N, N′-bis-[4-(phenyl-m-tolyl-amino)-phenyl]-biphenyl-4,4′-diamine (DNTPD), 4,4′,4″-tris(3-methylphenylphenylamino)triphenylamine (m-MTDATA), 4,4′,4″-tris(N,N-diphenylamino)triphenylamine (TDATA), 4,4′,4″-tris {N-(2-naphthyl)-N-phenylamino}-triphenylamine (2-TNATA), polyaniline/dodecylbenzenesulfonic acid (PANI/DBSA), polyaniline/camphor sulfonic acid (PANI/CSA), (polyaniline)/poly(4-styrenesulfonate) (PANI/PSS), N,N′-di(naphthalene-1-yl)-N, N′-diphenyl-benzidine (NPB), 4-isopropyl-4′-methyldiphenyliodonium tetrakis(pentafluorophenyl) borate, a fluorine-based derivative, 4,4′,4″-tris(N-carbazolyl)triphenylamine (TCTA), 4,4′-bis[N,N′-(3-tolyl)amino]-3,3′-dimethylbiphenyl (HMTPD), 1,3-Bis(N-carbazolyl)benzene (mCP), 9-(4-tert-butylphenyl)-3,6-bis(triphenylsilyl)-9H-carbazole (CzSi), 9-phenyl-9H-3,9′-bicarbazole (CCP), and 1,3-bis(1,8-dimethyl-9H-carbazol-9-yl)benzene (mDCP),

OG Complex Work Unit Chemistry
wherein in Formula H-1,
L1 and L2 are each independently a substituted or unsubstituted arylene group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroarylene group having 2 to 30 ring-forming carbon atoms,
a and b are each independently an integer of 0 to 10,
Ar1 and Ar2 are each independently a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring-forming carbon atoms, and
Ar3 is a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms,
wherein a substituent of the substituted arylene group, the substituted heteroarylene group, the substituted aryl group, and the substituted heteroaryl group is selected from the group consisting of a deuterium atom, a halogen atom, a cyano group, a nitro group, an amino group, a silyl group, an oxy group, a sulfinyl group, a sulfonyl group, a carbonyl group, a boron group, a phosphine oxide group, a phosphine sulfide group, an alkyl group, an alkoxy group, a hydrocarbon ring group, an aryl group, and a heterocyclic group.