US 11,943,948 B2
Light emitting device
Akira Hirasawa, Tokyo (JP); and Yuhki Terao, Tokyo (JP)
Assigned to PIONEER CORPORATION, Tokyo (JP)
Appl. No. 17/418,709
Filed by PIONEER CORPORATION, Tokyo (JP)
PCT Filed Dec. 26, 2019, PCT No. PCT/JP2019/051164
§ 371(c)(1), (2) Date Jun. 25, 2021,
PCT Pub. No. WO2020/138306, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2018-247736 (JP), filed on Dec. 28, 2018.
Prior Publication US 2022/0085316 A1, Mar. 17, 2022
Int. Cl. H10K 50/17 (2023.01); H10K 50/15 (2023.01); H10K 71/00 (2023.01); H10K 102/00 (2023.01)
CPC H10K 50/17 (2023.02) [H10K 50/156 (2023.02); H10K 71/00 (2023.02); H10K 2102/00 (2023.02); H10K 2102/351 (2023.02)] 8 Claims
OG exemplary drawing
 
1. A light emitting device comprising:
a first electrode;
an organic layer positioned over the first electrode and comprising a first layer; and
a second electrode positioned over the organic layer,
wherein the first layer comprises
a first region comprising a first organic material and a compound comprising a metal element, the first region being in contact with the first electrode,
a second region comprising the first organic material and the compound, the second region being positioned farther away from the first electrode than the first region, and
a third region comprising the first organic material and the compound, the third region being positioned between the first region and the second region,
an average intensity of a SIMS profile of the metal element in the second region is lower than 10% of an average intensity of a SIMS profile of the metal element in the first region,
an intensity distribution of the SIMS profile of the metal element in the first region and an intensity distribution of the SIMS profile of the metal element in the second region are more uniform than an intensity distribution of a SIMS profile of the metal element in the third region, and
an intensity of the SIMS profile of the metal element in the third region decreases from the first region to the second region.