Composition, film, organic light emitting element, method for providing light emitting composition, and program

Patent metadata

Field	Value
Publication number	US-12180399-B2
Application number	US-202117760072-A
Country	US
Kind code	B2
Filing date	Feb 3, 2021
Priority date	Feb 4, 2020
Publication date	Dec 31, 2024
Grant date	Dec 31, 2024

Abstract

An organic light emitting element produced by using a light emitting composition that contains both a first compound having a PBHT value more than 0.730 and a second compound having E S1 lower than that of the first compound and ΔE ST less than 0.20 eV is excellent in durability. E S1 is the lowest excited singlet energy level, ΔE ST is the difference between the lowest excited singlet energy level and the lowest excited triplet energy level.

First claim

The invention claimed is:

1. A composition consisting of both a first compound satisfying the following expression (1a) and a second compound satisfying the following expression (2b), or consisting of a first compound satisfying the following expression (1a), a second compound satisfying the following expression (2b) and a third compound that is a fluorescence material,
the first compound and the second compound satisfying the following expression (A):
PBHT(1)>0.830  expression (1a)

Δ E ST (2)<0.20 eV  expression(2b)

E S1 (1)> E S1 (2)  expression (A)

the first compound, the second compound and the third compound satisfying the following expression (B):
E S1 (1)> E S1 (2)> E S1 (3)  expression (B)

wherein PBHT(1) is a PBHT value of the first compound, ΔE ST (2) is a difference between a lowest excited singlet energy level E S1 (2) of the second compound and a lowest excited triplet energy level E T1 (2) of the second compound, and E S1 (1) is a lowest excited singlet energy level of the first compound, and E S1 (3) is a lowest excited singlet energy level of the third compound.

2. The composition according to claim 1 , wherein the first compound also satisfies the following expression (1c):
BDE(1)>4.20 eV  expression (1c)

wherein BDE(1) is a cation bond dissociation energy of the first compound.

3. The composition according to claim 1 , wherein the second compound also satisfies the following expression (2a):
0.200<PBHT(2)<0.400  expression (2a)

wherein PBHT(2) is a PBHT value of the second compound.

4. The composition according to claim 1 , wherein the first compound also satisfies the following expression (1c) and the second compound also satisfies the following expression (2a):
BDE(1)>4.20 eV  expression (1c)

0.200<PBHT(2)<0.400  expression (2a)

wherein BDE(1) is a cation bond dissociation energy of the first compound and PBHT(2) is a PBHT value of the second compound.

5. The composition according to claim 1 , wherein the PBHT(1) is more than 0.910.

6. The composition according to claim 1 , wherein the second compound satisfies the following expression (2d):
τ DELAY <10 μs  expression (2d)

wherein τ DELAY is a delayed fluorescence lifetime of the second compound.

7. The composition according to claim 1 , wherein the first compound has one or more structures selected from the group consisting of a triazine structure, a carbazole structure, a fulvalene structure, and a thiovalene structure.

8. The composition according to claim 1 , wherein the first compound has at least one of a dibenzofuran structure and a dibenzothiophene structure.

9. The composition according to claim 8 , wherein the first compound has a structure represented by the following the general formula (1):

wherein multiple Xs each independently represent O or S, Y 1 to Y 8 and Y 11 to Y 18 each independently represent N or C—R wherein R represents a hydrogen atom, a substituent, or a direct bond to L, Y 21 to Y 28 each independently represent N or C—R′ wherein R′ represents a hydrogen atom or a substituent, L represents a (n+p+1)-valent conjugated linking group having at least one aromatic ring or heteroaromatic ring, n represents an integer of 0 or more, when n is 2 or more, multiple Y 11 s to Y 18 s may be the same as or different from each other, p represents an integer of 0 or more, when p is 2 or more, multiple Y 21 s to Y 28 s may be the same as or different from each other, and n+p is 1 or more.

10. The composition according to claim 8 , wherein the first compound has a structure represented by the following general formula (2):

wherein multiple Xs each independently represent O or S, Y 1 to Y 8 and Y 11 to Y 18 each independently represent N or C—R wherein R represents a hydrogen atom, a substituent, or a direct bond to L, L represents a (n+1)-valent conjugated linking group containing at least one aromatic ring or heteroaromatic ring, n represents an integer of 1 or more, and when n is 2 or more, multiple Y 11 s to Y 18 s may be the same as or different from each other.

11. The composition according to claim 8 , wherein the first compound has a structure represented by the following general formula (3):

wherein multiple Xs each independently represent O or S, Y 1 , Y 2 , Y 4 to Y 8 and Y 11 to Y 18 each independently represent N or C—R wherein R represents a hydrogen atom, a substituent, or a direct bond to L, L represents a (n+1)-valent conjugated linking group containing at least one aromatic ring or heteroaromatic ring, n represents an integer of 2 or more, and multiple Y 11 s to Y 18 s may be the same as or different from each other.

12. The composition according to claim 8 , wherein the first compound has a structure represented by the following general formula (4):

wherein multiple Xs each independently represent O or S, Y 1 to Y 8 and Y 12 to Y 18 each independently represent N or C—R wherein R represents a hydrogen atom, a substituent, or a direct bond to L, L represents a (n+1)-valent conjugated linking group containing at least one aromatic ring or heteroaromatic ring, n represents an integer of 2 or more, and multiple Y 11 s to Y 18 s may be the same as or different from each other.

13. The composition according to claim 8 , wherein the first compound has a structure represented by the following general formula (5):

wherein X represents O or S, Y 1 to Y 8 each independently represent N or C—R wherein R represents a hydrogen atom, a substituent, or a direct bond to L, Y 21 to Y 28 each independently represent N or C—R′ wherein R′ represents a hydrogen atom or a substituent, L represents a (p+1)-valent conjugated linking group containing at least one aromatic ring or heteroaromatic ring, p represents an integer of 1 or more, and when p is 2 or more, multiple Y 21 s to Y 28 s may be the same as or different from each other.

14. The composition according to claim 9 , wherein L has a structure having one or more rings linked, the rings being selected from the group consisting of a benzene ring and a pyridine ring.

15. The composition according to claim 9 , wherein L comprises a 1,3-phenylene group or a 2,6-pyridylene group as a linking chain.

16. The composition according to claim 9 , wherein L comprises a 1,4-phenylene group or a 2,6-pyridylene group as a linking chain.

17. The composition according to claim 9 , wherein n is 2.

18. The composition according to claim 9 , wherein R is a hydrogen atom or a substituted or unsubstituted aryl group.

19. The composition according to claim 1 , wherein a content of the second compound is 0.01 to 70 parts by weight relative to 100 parts by weight of a content of the first compound.

20. The composition according to claim 1 , wherein the third compound also satisfies the following expression (3b):
Δ E ST (3)<0.20 eV  expression(3b)

wherein ΔE ST (3) is a difference between the lowest excited singlet energy level E S1 (3) of t

Assignees

• Kyulux Inc

Inventors

• Kakizoe Hayato
• Ozawa Hiroaki
• Endo Ayataka
• Yang Yuseok

Classifications

• H10K85/658

  Organoboranes · CPC title

• H10K2101/20

  Delayed fluorescence emission · CPC title

• C09K11/02 Primary

  Use of particular materials as binders, particle coatings or suspension media therefor · CPC title

• C09K11/06 Primary

  containing organic luminescent materials · CPC title

• C07D409/14

  containing three or more hetero rings · CPC title