US 12,396,318 B2
Organic EL display device, and electronic apparatus
Satomi Tasaki, Tokyo (JP); Tetsuya Masuda, Tokyo (JP); Kengo Kishino, Tokyo (JP); Kazuki Nishimura, Tokyo (JP); Yuki Nakano, Tokyo (JP); and Yuichiro Kawamura, Tokyo (JP)
Assigned to IDEMITSU KOSAN CO.,LTD., Tokyo (JP)
Appl. No. 17/774,047
Filed by IDEMITSU KOSAN CO., LTD., Tokyo (JP)
PCT Filed Nov. 6, 2020, PCT No. PCT/JP2020/041597
§ 371(c)(1), (2) Date May 3, 2022,
PCT Pub. No. WO2021/090931, PCT Pub. Date May 14, 2021.
Claims priority of application No. 2019-203195 (JP), filed on Nov. 8, 2019.
Prior Publication US 2023/0006160 A1, Jan. 5, 2023
Int. Cl. H10K 50/13 (2023.01); H10K 50/11 (2023.01); H10K 85/60 (2023.01); H10K 101/10 (2023.01)
CPC H10K 50/13 (2023.02) [H10K 50/11 (2023.02); H10K 85/615 (2023.02); H10K 85/622 (2023.02); H10K 85/6574 (2023.02); H10K 2101/10 (2023.02)] 24 Claims
OG exemplary drawing
 
1. An organic EL display device comprising:
an anode and a cathode disposed opposite each other; and
a blue organic EL device serving as a pixel, a green organic EL device serving as a pixel, and a red organic EL device serving as a pixel, wherein
the blue organic EL device comprises a first emitting layer disposed between the anode and the cathode;
the green organic EL device comprises a second emitting layer disposed between the anode and the cathode;
the red organic EL device comprises a third emitting layer disposed between the anode and the cathode;
the blue organic EL device, the green organic EL device, and the red organic EL device comprise a fourth emitting layer disposed in common across the blue organic EL device, the green organic EL device, and the red organic EL device;
the fourth emitting layer is disposed between the cathode and the first emitting layer, the second emitting layer, and the third emitting layer;
the fourth emitting layer is in direct contact with each of the first emitting layer, the second emitting layer, and the third emitting layer;
the first emitting layer contains a first compound serving as a first host material;
the fourth emitting layer contains a second compound serving as a second host material;
the first host material and the second host material are mutually different;
the first emitting layer contains at least a compound that emits light with a maximum peak wavelength of 500 nm or less;
the fourth emitting layer contains at least a compound that emits light with a maximum peak wavelength of 500 nm or less;
the compound that is contained in the first emitting layer and that emits light with a maximum peak wavelength of 500 nm or less and the compound that is contained in the fourth emitting layer and that emits light with a maximum peak wavelength of 500 nm or less are mutually the same or different;
a triplet energy T1(H1) of the first host material and a triplet energy T1(H2) of the second host material satisfy a relationship of a numerical formula (Numerical Formula 1A) below:
T1(H1)>T1(H2)  (Numerical Formula 1A),and
the triplet energy T1(H1) of the first host material satisfies a relationship of a numerical formula (Numerical Formula 12C) below:
2.08 eV>T1(H1)>1.87 eV  (Numerical Formula 12C).