US 12,193,324 B2
Melt mixture for organic electroluminescent element, and organic electroluminescent element
Masashi Tada, Tokyo (JP); and Yuta Sagara, Tokyo (JP)
Assigned to NIPPON STEEL Chemical & Material Co., Ltd., Tokyo (JP)
Appl. No. 17/442,601
Filed by NIPPON STEEL Chemical & Material Co., Ltd., Tokyo (JP)
PCT Filed Mar. 13, 2020, PCT No. PCT/JP2020/010975
§ 371(c)(1), (2) Date Sep. 23, 2021,
PCT Pub. No. WO2020/195917, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-056860 (JP), filed on Mar. 25, 2019.
Prior Publication US 2022/0173326 A1, Jun. 2, 2022
Int. Cl. H01L 51/50 (2006.01); H10K 71/16 (2023.01); H10K 85/60 (2023.01); H10K 50/11 (2023.01); H10K 50/12 (2023.01); H10K 101/10 (2023.01)
CPC H10K 85/654 (2023.02) [H10K 71/164 (2023.02); H10K 85/626 (2023.02); H10K 85/6572 (2023.02); H10K 85/6574 (2023.02); H10K 85/6576 (2023.02); H10K 50/11 (2023.02); H10K 50/12 (2023.02); H10K 2101/10 (2023.02)] 8 Claims
OG exemplary drawing
 
1. A melt mixture for an organic electroluminescent device which is a melt mixture of at least two types of organic compounds,
wherein the two types of organic compounds include a first organic compound and a second organic compound,
a difference in vapor deposition temperature between the first organic compound and the second organic compound is 20° C. or less, and
a difference between a maximum emission wavelength of a fluorescence-emitting spectrum of the melt mixture and a maximum emission wavelength of a fluorescence-emitting spectrum of any of the first organic compound and the second organic compound is within ±10 nm,
the first organic compound and the second organic compound are hosts used in a light-emitting layer containing a host and a light-emitting dopant.