US 11,700,734 B2
Organic el element, and organic el display panel including light- emitting layer and functional layer with specific hole and electron mobilities relationship
Toshiyuki Akiyama, Tokyo (JP); Yasuhiro Sekimoto, Tokyo (JP); Muneharu Sato, Tokyo (JP); Shinichiro Ishino, Tokyo (JP); Tomohiko Oda, Tokyo (JP); and Mineki Hasegawa, Tokyo (JP)
Assigned to JOLED INC., Tokyo (JP)
Filed by JOLED Inc., Tokyo (JP)
Filed on Nov. 20, 2020, as Appl. No. 16/953,370.
Claims priority of application No. 2019-217515 (JP), filed on Nov. 29, 2019.
Prior Publication US 2021/0167312 A1, Jun. 3, 2021
Int. Cl. H10K 50/11 (2023.01); H10K 71/00 (2023.01); H10K 101/40 (2023.01); H10K 50/16 (2023.01); H10K 59/35 (2023.01); H10K 101/30 (2023.01)
CPC H10K 50/11 (2023.02) [H10K 71/00 (2023.02); H10K 50/166 (2023.02); H10K 59/35 (2023.02); H10K 2101/30 (2023.02); H10K 2101/40 (2023.02)] 9 Claims
OG exemplary drawing
 
1. An organic electroluminescence (EL) element comprising: an anode; a light-emitting layer; a functional layer; and a cathode stacked in this order, wherein
the light-emitting layer and the functional layer are in contact with each other,
hole mobility of the light-emitting layer is greater than electron mobility of the light-emitting layer,
the electron mobility of the light-emitting layer is greater than an effective electron mobility of the functional layer, and
a highest occupied molecular orbital (HOMO) level of a first functional material included in the light-emitting layer is at least 0.4 eV greater than a HOMO level of a second functional material included in the functional layer.