	US 12,358,883 B2
	Light-emitting device and electronic apparatus including the same
Seulong Kim, Yongin-si (KR); and Hyein Jeong, Yongin-si (KR)
Assigned to Samsung Display Co., Ltd., Yongin-si (KR)
Filed by Samsung Display Co., Ltd., Yongin-si (KR)
Filed on Dec. 14, 2021, as Appl. No. 17/551,077.
Claims priority of application No. 10-2021-0000446 (KR), filed on Jan. 4, 2021.
Prior Publication US 2022/0223789 A1, Jul. 14, 2022
Int. Cl. H10K 50/13 (2023.01); H10K 85/40 (2023.01); H10K 85/60 (2023.01); H10K 50/11 (2023.01); H10K 50/12 (2023.01); H10K 50/155 (2023.01); H10K 50/16 (2023.01); H10K 50/17 (2023.01); H10K 71/00 (2023.01); H10K 101/10 (2023.01)

CPC H10K 85/633 (2023.02) [H10K 85/40 (2023.02); H10K 85/624 (2023.02); H10K 85/626 (2023.02); H10K 85/636 (2023.02); H10K 85/6572 (2023.02); H10K 85/6574 (2023.02); H10K 85/6576 (2023.02); H10K 50/11 (2023.02); H10K 50/12 (2023.02); H10K 50/13 (2023.02); H10K 50/155 (2023.02); H10K 50/16 (2023.02); H10K 50/171 (2023.02); H10K 71/00 (2023.02); H10K 2101/10 (2023.02)]

20 Claims

1. A light-emitting device comprising:

a first electrode;

a second electrode facing the first electrode; and

an interlayer comprising an emission layer between the first electrode and the second electrode and a hole transport region between the first electrode and the emission layer,

wherein the emission layer comprises a dopant,

the hole transport region comprises a first hole transport layer, a second hole transport layer between the first hole transport layer and the emission layer, and a third hole transport layer between the second hole transport layer and the emission layer,

the first hole transport layer comprises a first compound, the first compound being a carbazole-free compound,

the second hole transport layer comprises a second compound,

the third hole transport layer comprises a third compound,

the first to third compounds are each independently an amine-based compound, and are different from each other, and

Equation 1 is satisfied:

T₁(HTM3)≥T₁(D)+0.3 eV, and Equation 1

wherein, in Equation 1,

T₁(HTM3) is a triplet energy level in electron volt (eV) of the third compound,

T₁(D) is a triplet energy level in electron volt (eV) of the dopant, and

T₁(HTM3) and T₁(D) are values evaluated utilizing a density functional theory (DFT) method of a Gaussian program, which is structure-optimized at a B3LYP/6-31G(d,p) level.