US 11,956,980 B2
Organic light emitting device and display device using the same
Gyeong-Woo Kim, Seoul (KR); Hong-Seok Choi, Seoul (KR); Seung-Ryong Joung, Seoul (KR); Jun-Ho Lee, Seoul (KR); Yoon-Deok Han, Yongin-si (KR); and Hee-Su Byeon, Paju-si (KR)
Assigned to LG DISPLAY CO., LTD., Seoul (KR)
Filed by LG Display Co., Ltd., Seoul (KR)
Filed on Dec. 24, 2020, as Appl. No. 17/133,874.
Claims priority of application No. 10-2019-0175566 (KR), filed on Dec. 26, 2019.
Prior Publication US 2021/0202876 A1, Jul. 1, 2021
Int. Cl. H10K 50/12 (2023.01); H10K 50/11 (2023.01); H10K 59/121 (2023.01); H10K 59/38 (2023.01); H10K 101/10 (2023.01)
CPC H10K 50/121 (2023.02) [H10K 50/11 (2023.02); H10K 59/1213 (2023.02); H10K 59/38 (2023.02); H10K 2101/10 (2023.02)] 22 Claims
OG exemplary drawing
 
1. An organic light emitting device comprising:
a light emitting layer provided between a first electrode and a second electrode arranged opposite each other,
wherein the light emitting layer comprises at least one host, a blue phosphorescent dopant for a blue color and a blue fluorescent dopant for the blue color in a single layer,
wherein a light emission for the blue color is concentrated upon the blue fluorescent dopant through energy transfers from the host and the blue phosphorescent dopant to the blue fluorescent dopant in the single layer,
wherein the blue phosphorescent dopant is configured to have a first triplet energy level; and
wherein the blue fluorescent dopant is configured to have a second triplet energy level lower than the first triplet energy level and to generate fluorescence and thermally activated delayed fluorescence (TADF).