Light emitting element and light emitting device
View Patent ↗It is an object of the present invention to obtain an organometallic complex that is capable of converting an excited triplet state into luminescence, a light-emitting element that can be driven for a long time, is high in luminous efficiency, and has a favorable long lifetime, and a light-emitting device using the light-emitting element. The present invention provides a light-emitting element that has a pair of electrodes (an anode and a cathode) and a light-emitting layer between a pair of electrodes, where the light-emitting layer includes an organometallic complex represented by the following general formula (5) and one of a compound that has a larger energy gap than the organometallic complex and a compound that has a larger ionization potential and a smaller electron affinity than the organometallic complex, and provides a light-emitting device using the light-emitting device.
1. An organometallic complex represented by the following formula,
wherein each of R 2 to R 5 , R 7 , R 9 , R 10 , R 12 , and R 14 is hydrogen,
wherein each of R 6 , R 8 , R 11 , and R 13 is any one selected from the group consisting of a hydrogen, a halogen element, an acyl group, an alkyl group, an alkoxyl group, an aryl group, a cyano group, a heterocyclic group, and an electron-withdrawing group,
wherein at least one of R 6 and R 8 is an electron-withdrawing group,
wherein M is an element of Group 9,
wherein n=2, and
wherein L is a monoanionic ligand.
2. The organometallic complex according to claim 1 , wherein the acyl group is any one selected from the group consisting of an acetyl group, a propionyl group, an isobutyryl group, and a methacryloyl group.
3. The organometallic complex according to claim 1 , wherein the alkyl group is any one selected from the group consisting of a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, a tert-butyl group, and an octyl group.
4. The organometallic complex according to claim 1 , wherein the alkoxyl group is any one selected from the group consisting of a methoxy group, an ethoxy group, and a propoxy group.
5. The organometallic complex according to claim 1 , wherein the aryl group is any one selected from the group consisting of a phenyl group, a 4-methylphenyl group and a 4-ethylphenyl group.
6. The organometallic complex according to claim 1 , wherein the heterocyclic group is any one selected from the group consisting of a pyridyl group, bipyridyl group, and a methylpyridyl group.
7. The organometallic complex according to claim 1 , wherein the electron-withdrawing group is any one selected from the group consisting of a fluoro group, a trifluoro trifluoromethyl group, and a cyano group.
8. The organometallic complex according to claim 1 , wherein the monoanionic ligand is any one selected from the following formulas (a) to (g),
9. A light emitting device comprising:
a light emitting element including a first electrode, a second electrode, and a light emitting layer formed therebetween,
wherein the light emitting layer comprises the organometallic complex according to claim 1 .
10. An organometallic complex represented by the following formula,
wherein each of R 2 to R 5 , R 7 , R 9 , R 10 , R 12 , and R 14 is hydrogen,
wherein each of R 6 , R 8 , R 11 , and R 13 is any one selected from the group consisting of a hydrogen, a halogen element, an acyl group, an alkyl group, an alkoxyl group, an aryl group, a cyano group, a heterocyclic group, and an electron-withdrawing group,
wherein at least one of R 6 and R 8 is an electron-withdrawing group, and
wherein L is a monoanionic ligand.
11. The organometallic complex according to claim 10 , wherein the acyl group is any one selected from the group consisting of an acetyl group, a propionyl group, an isobutyryl group, and a methacryloyl group.
12. The organometallic complex according to claim 10 , wherein the alkyl group is any one selected from the group consisting of a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, a tert-butyl group, and an octyl group.
13. The organometallic complex according to claim 10 , wherein the alkoxyl group is any one selected from the group consisting of a methoxy group, an ethoxy group, and a propoxy group.
14. The organometallic complex according to claim 10 , wherein the aryl group is any one selected from the group consisting of a phenyl group, a 4-methylphenyl group and a 4-ethylphenyl group.
15. The organometallic complex according to claim 10 , wherein the heterocyclic group is any one selected from the group consisting of a pyridyl group, bipyridyl group, and a methylpyridyl group.
16. The organometallic complex according to claim 10 , wherein the electron-withdrawing group is any one selected from the group consisting of a fluoro group, a trifluoromethyl group, and a cyano group.
17. The organometallic complex according to claim 10 , wherein the monoanionic ligand is any one selected from the following formulas (a) to (g),
18. A light emitting device comprising:
a light emitting element including a first electrode, a second electrode, and a light emitting layer formed therebetween,
wherein the light emitting layer comprises the organometallic complex according to claim 10 .
19. An organometallic complex represented by the following formula,
wherein M is an element of Group 9, and
wherein L is a monoanionic ligand.
20. The organometallic complex according to claim 19 , wherein the monoanionic ligand is any one selected from the following formulas (a) to (g),
21. A light emitting device comprising:
a light emitting element including a first electrode, a second electrode, and a light emitting layer formed therebetween,
wherein the light emitting layer comprises the organometallic complex according to claim 19 .
22. An organometallic complex represented by the following formula,
wherein each of R 2 to R 5 , R 7 , R 9 , R 10 , R 12 , and R 14 is hydrogen,
wherein each of R 6 , R 8 , R 11 , and R 13 is any one selected from the group consisting of a hydrogen, a halogen element, an acyl group, an alkyl group, an alkoxyl group, an aryl group, a cyano group, a heterocyclic group, and an electron-withdrawing group,
wherein at least one of R 6 , R 8 , R 11 , and R 13 is a halogen element,
wherein M is an element of Group 9,
wherein n=2, and
wherein L is a monoanionic ligand.
23. An organometallic complex represented by the following formula,
wherein each of R 2 to R 5 , R 7 , R 9 , R 10 , R 12 , and R 14 is hydrogen,
wherein each of R 6 , R 8 , R 11 , and R 13 is any one selected from the group consisting of a hydrogen, a halogen element, an acyl group, an alkyl group, an alkoxyl group, an aryl group, a cyano group, a heterocyclic group, and an electron-withdrawing group,
wherein at least one of R 6 , R 8 , R 11 , and R 13 is a fluorine,
wherein M is an element of Group 9,
wherein n=2, and
wherein L is a monoanionic ligand.
24. An organometallic complex represented by the following formula,
wherein each of R 2 to R 5 , R 7 , R 9 , R 10 , R 12 , and R 14 is hydrogen,
wherein each of R 6 , R 8 , R 11 , and R 13 is an electron-withdrawing group,
wherein M is an element of Group 9,
wherein n=2, and
wherein L is a monoanionic ligand.
25. An organometallic complex represented by the following formula,
wherein each of R 2 to R 5 , R 7 , R 9 , R 10 , R 12 , and R 14 is hydrogen,
wherein each of R 6 , R 8 , R 11 , and R 13 is a halogen,
wherein M is an element of Group 9,
wherein n=2, and
wherein L is a monoanionic ligand.