US 11,758,749 B2
Organic EL element having one functional layer with NaF and the other functional layer with Yb
Kosuke Mishima, Tokyo (JP); Koyo Sakamoto, Tokyo (JP); and Muneharu Sato, Tokyo (JP)
Assigned to JOLED INC., Tokyo (JP)
Filed by JOLED Inc., Tokyo (JP)
Filed on Jul. 12, 2021, as Appl. No. 17/372,520.
Application 17/372,520 is a division of application No. 16/662,066, filed on Oct. 24, 2019, abandoned.
Claims priority of application No. 2018-201837 (JP), filed on Oct. 26, 2018.
Prior Publication US 2021/0343968 A1, Nov. 4, 2021
Int. Cl. H10K 50/17 (2023.01); H10K 50/818 (2023.01); H10K 50/828 (2023.01); H10K 59/35 (2023.01); H10K 71/00 (2023.01); H10K 102/00 (2023.01)
CPC H10K 50/171 (2023.02) [H10K 50/818 (2023.02); H10K 50/828 (2023.02); H10K 59/35 (2023.02); H10K 71/00 (2023.02); H10K 2102/351 (2023.02)] 13 Claims
OG exemplary drawing
 
1. An organic electroluminescence element comprising:
an anode;
an organic light emitting layer disposed on an upper side of the anode;
a first functional layer disposed over the organic light emitting layer and including NaF;
a second functional layer disposed over the first functional layer and including an organic material containing Yb; and
a cathode disposed on an upper side of the second functional layer,
wherein the second functional layer includes a first layer section, a second layer section and a third layer section that are sequentially stacked in this order from a first functional layer side, and a relation of X2<X1<X3 is satisfied, where X1, X2 and X3 are Yb contents of the first layer section, the second layer section and the third layer section, respectively.