US 11,925,047 B2
Light-emitting device and display device using the same
Chun Ki Kim, Seoul (KR); Jung Keun Kim, Seoul (KR); Yu Jeong Lee, Seoul (KR); and Wook Song, Seoul (KR)
Assigned to LG Display Co., Ltd., Seoul (KR)
Filed by LG Display Co., Ltd., Seoul (KR)
Filed on May 26, 2021, as Appl. No. 17/331,406.
Claims priority of application No. 10-2020-0190049 (KR), filed on Dec. 31, 2020.
Prior Publication US 2022/0209200 A1, Jun. 30, 2022
Int. Cl. H10K 50/19 (2023.01); H10K 50/11 (2023.01); H10K 59/12 (2023.01); H10K 59/38 (2023.01); H10K 101/10 (2023.01); H10K 101/30 (2023.01); H10K 101/00 (2023.01); H10K 102/00 (2023.01)
CPC H10K 50/19 (2023.02) [H10K 50/11 (2023.02); H10K 59/12 (2023.02); H10K 59/38 (2023.02); H10K 2101/10 (2023.02); H10K 2101/30 (2023.02); H10K 2101/90 (2023.02); H10K 2102/3035 (2023.02)] 19 Claims
OG exemplary drawing
 
1. A light-emitting device comprising:
a first electrode, an electron blocking layer, a first emissive layer, a second emissive layer, and an electron transport layer, and a second electrode, which are sequentially disposed, wherein
the first emissive layer comprises a first host and a first blue dopant,
the second emissive layer comprises a second host and a second blue dopant,
a triplet energy level of the first host is greater than a triplet energy level of the second host,
a triplet energy level of the first blue dopant is greater than the triplet energy level of the first host,
a singlet energy level of the first host is greater than a singlet energy level of the second host, and
the singlet energy level of the second host is greater than a singlet energy level of the first blue dopant.