US 12,464,886 B2
Light-emitting element, display device, electronic device, and lighting device
Takahiro Ishisone, Atsugi (JP); and Satoshi Seo, Sagamihara (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., Atsugi (JP)
Filed by Semiconductor Energy Laboratory Co., Ltd., Atsugi (JP)
Filed on Aug. 21, 2020, as Appl. No. 16/999,440.
Application 16/999,440 is a continuation of application No. 15/498,692, filed on Apr. 27, 2017, granted, now 10,756,286.
Claims priority of application No. 2016-093149 (JP), filed on May 6, 2016.
Prior Publication US 2020/0395566 A1, Dec. 17, 2020
Int. Cl. H01L 51/50 (2006.01); H10K 50/11 (2023.01); H10K 50/12 (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 102/00 (2023.01)
CPC H10K 50/121 (2023.02) [H10K 50/11 (2023.02); H10K 85/342 (2023.02); H10K 85/615 (2023.02); H10K 85/626 (2023.02); H10K 85/633 (2023.02); H10K 85/636 (2023.02); H10K 85/654 (2023.02); H10K 85/6572 (2023.02); H10K 85/6576 (2023.02); H10K 2101/10 (2023.02); H10K 2101/27 (2023.02); H10K 2101/30 (2023.02); H10K 2101/90 (2023.02); H10K 2102/361 (2023.02)] 14 Claims
OG exemplary drawing
 
1. A light-emitting device comprising:
a first electrode;
a light-emitting layer over the first electrode, the light-emitting layer comprising a first organic compound and a second organic compound; and
a second electrode over the light-emitting layer,
wherein the first organic compound is a phosphorescent compound,
wherein the first organic compound comprises a transition metal element,
wherein a combination of the first organic compound and the second organic compound is a combination whose electroluminescence spectrum in a region from 400 nm to 680 nm at room temperature does not exhibit any peaks assigned to the first organic compound or the second organic compound, and exhibits a peak assigned to an exciplex of the first organic compound and the second organic compound in a mixed film form of the first organic compound and the second organic compound at a weight ratio of the first organic compound to the second organic compound being 0.1, and
wherein the exciplex of the first organic compound and the second organic compound has a larger luminance quantum yield than the first organic compound at room temperature.