US 11,943,946 B2
White organic light emitting element and display device using the same
Wook Song, Seoul (KR); Eun-Jung Park, Goyang-si (KR); Chun-Ki Kim, Seoul (KR); and Se-Ung Kim, Seoul (KR)
Assigned to LG Display Co., Ltd., Seoul (KR)
Filed by LG Display Co., Ltd., Seoul (KR)
Filed on Nov. 23, 2020, as Appl. No. 17/102,049.
Claims priority of application No. 10-2019-0161896 (KR), filed on Dec. 6, 2019.
Prior Publication US 2021/0175456 A1, Jun. 10, 2021
Int. Cl. H10K 50/13 (2023.01); H10K 50/11 (2023.01); H10K 50/15 (2023.01); H10K 50/19 (2023.01); H10K 59/12 (2023.01); H10K 59/38 (2023.01); H10K 85/30 (2023.01); H10K 85/60 (2023.01); H10K 101/00 (2023.01); H10K 101/10 (2023.01); H10K 101/30 (2023.01); H10K 101/40 (2023.01)
CPC H10K 50/131 (2023.02) [H10K 50/11 (2023.02); H10K 50/15 (2023.02); H10K 50/19 (2023.02); H10K 59/38 (2023.02); H10K 59/12 (2023.02); H10K 85/342 (2023.02); H10K 85/654 (2023.02); H10K 2101/10 (2023.02); H10K 2101/27 (2023.02); H10K 2101/30 (2023.02); H10K 2101/40 (2023.02); H10K 2101/90 (2023.02)] 20 Claims
OG exemplary drawing
 
1. A white organic light emitting element comprising:
a first electrode and a second electrode opposite each other; and
at least one blue light emitting stack and a phosphorescent light emitting stack provided between the first electrode and the second electrode and separated from each other by a charge generation layer,
wherein the phosphorescent light emitting stack comprises a hole transport layer, a red light emitting layer for emitting a single red color on the hole transport layer, a green light emitting layer on the red light emitting layer, and an electron transport layer on the green light emitting layer,
wherein the red light emitting layer comprises a red dopant and red hosts,
wherein the hole transport layer is positioned between the charge generation layer and the red light emitting layer, and
wherein the red dopant has a highest occupied molecular orbital (HOMO) energy level lower than a HOMO energy level of the hole transport layer, and higher than a HOMO energy level of the red hosts.