Granted Patent
B2
US 12,581,794 · App. 18/527,505 · Granted Mar 17, 2026
Light-emitting element
Inventors:
Satoshi Seo (Sagamihara, JP); Satoko Shitagaki (Isehara, JP); Nobuharu Ohsawa (Zama, JP); Hideko Inoue (Atsugi, JP); Kunihiko Suzuki (Isehara, JP)
H10K50/121C07D409/10C09K11/06H05B33/14H10K50/11H10K85/6572H10K85/6576C09K2211/1007C09K2211/1011C09K2211/1029C09K2211/1044C09K2211/1088C09K2211/1092C09K2211/185H10K85/342H10K85/624H10K85/626H10K85/631H10K85/633H10K85/636H10K2101/10
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Abstract
Provided is a light-emitting element which includes a light-emitting layer containing a phosphorescent compound, a first organic compound, and a second organic compound between a pair of electrodes. A combination of the first organic compound and the second organic compound forms an exciplex (excited complex). An emission spectrum of the exciplex overlaps with an absorption band located on the longest wavelength side of an absorption spectrum of the phosphorescent compound. A peak wavelength of the emission spectrum of the exciplex is longer than or equal to a peak wavelength of the absorption band located on the longest wavelength side of the absorp-tion spectrum of the phosphorescent compound.
Claims (43)
1 . A light-emitting element comprising:
a pair of electrodes,
a light-emitting layer between the pair of electrodes,
wherein the light-emitting layer comprises a phosphorescent compound, a first organic compound, and a second organic compound,
wherein the first organic compound is a heteroaromatic compound,
wherein the second organic compound is an aromatic amine compound or a carbazole compound,
wherein the first organic compound and the second organic compound form an exciplex,
wherein an emission spectrum of the exciplex overlaps with an absorption band on a longest wavelength side of an absorption spectrum of the phosphorescent compound, and
wherein a difference between an emission peak wavelength of the exciplex and an emission peak wavelength of the phosphorescent compound is 30 nm or less.
2 . The light-emitting element according to claim 1 , wherein the absorption band corresponds to a direct transition from a singlet ground state to a triplet excitation state of the phosphorescent compound.
3 . The light-emitting element according to claim 1 , wherein the absorption band includes an absorption on the basis of a triplet MLCT transition of the phosphorescent compound.
4 . The light-emitting element according to claim 1 , wherein a triplet excitation energy level of each of the first and second organic compounds is higher than a triplet excitation energy level of the phosphorescent compound.
5 . The light-emitting element according to claim 1 , wherein the first organic compound and the second organic compound are fluorescent compounds.
6 . A light-emitting device comprising the light-emitting element according to claim 1 .
7 . A light-emitting element comprising:
a pair of electrodes,
a light-emitting layer between the pair of electrodes,
wherein the light-emitting layer comprises a phosphorescent compound, a first organic compound, and a second organic compound,
wherein the first organic compound is a heteroaromatic compound,
wherein the second organic compound is an aromatic amine compound or a carbazole compound,
wherein the first organic compound and the second organic compound form an exciplex,
wherein an emission spectrum of the exciplex overlaps with an absorption band on a longest wavelength side of an absorption spectrum of the phosphorescent compound, and
wherein an emission peak wavelength of the exciplex is longer than or equal to a peak wavelength of the absorption band on the longest wavelength side of the absorption spectrum of the phosphorescent compound and shorter than or equal to an emission peak wavelength of the phosphorescent compound.
8 . The light-emitting element according to claim 7 , wherein the absorption band corresponds to a direct transition from a singlet ground state to a triplet excitation state of the phosphorescent compound.
9 . The light-emitting element according to claim 7 , wherein the absorption band includes an absorption on the basis of a triplet MLCT transition of the phosphorescent compound.
10 . The light-emitting element according to claim 7 , wherein a triplet excitation energy level of each of the first and second organic compounds is higher than a triplet excitation energy level of the phosphorescent compound.
11 . The light-emitting element according to claim 7 , wherein the first organic compound and the second organic compound are fluorescent compounds.
12 . A light-emitting device comprising the light-emitting element according to claim 7 .
13 . The light-emitting element according to claim 7 , wherein a triplet excitation energy level of each of the first and second organic compounds is higher than a triplet excitation energy level of the phosphorescent compound.
14 . A light-emitting element comprising:
a pair of electrodes,
a light-emitting layer between the pair of electrodes,
wherein the light-emitting layer comprises a phosphorescent compound, a first organic compound, and a second organic compound,
wherein the first organic compound is a heteroaromatic compound,
wherein the second organic compound is an aromatic amine compound or a carbazole compound,
wherein the first organic compound and the second organic compound form an exciplex,
wherein an emission spectrum of the exciplex overlaps with an absorption band on a longest wavelength side of an absorption spectrum of the phosphorescent compound,
wherein an emission peak wavelength of the exciplex is longer than or equal to a peak wavelength of the absorption band on the longest wavelength side of the absorption spectrum of the phosphorescent compound and shorter than or equal to an emission peak wavelength of the phosphorescent compound, and
wherein a difference between the emission peak wavelength of the exciplex and the emission peak wavelength of the phosphorescent compound is 30 nm or less.
15 . The light-emitting element according to claim 14 , wherein the absorption band corresponds to a direct transition from a singlet ground state to a triplet excitation state of the phosphorescent compound.
16 . The light-emitting element according to claim 14 , wherein the absorption band includes an absorption on the basis of a triplet MLCT transition of the phosphorescent compound.
17 . The light-emitting element according to claim 14 , wherein the first organic compound and the second organic compound are fluorescent compounds.
18 . A light-emitting device comprising the light-emitting element according to claim 14 .
Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Dec 4, 2023
From: SEO, SATOSHI; SHITAGAKI, SATOKO; OHSAWA, NOBUHARU; INOUE, HIDEKO; SUZUKI, KUNIHIKO
To: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Reel/Frame 065747/0020 →
Priority Claims (1)
JP 2011-064553
· Mar 23, 2011
· national
Continuity (6)
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