Organometallic complex, light-emitting element, light-emitting device, electronic device, and lighting device
Provided is an organometallic complex which emits light with a short wavelength and has high emission efficiency and high heat resistance. The organometallic complex includes a central metal; and a first ligand, a second ligand, a third ligand, and a fourth ligand which are coordinated to the central metal. The first ligand includes a triazole skeleton including nitrogen bonded to the central metal. The second ligand includes an indolo[3,2-b]carbazole skeleton whose 6-position is bonded to the central metal or a pyrido[2,3-b:6,5-b′]diindole skeleton whose 6-position is bonded to the central metal. The third ligand includes a benzene skeleton whose carbon is bonded to the central metal. The fourth ligand includes a pyridine skeleton whose nitrogen is bonded to the central metal or a benzene skeleton whose carbon is bonded to the central metal.
1. A light-emitting element comprising:
an EL layer between a pair of electrodes,
wherein the EL layer comprises a light-emitting layer, and
wherein the light-emitting layer comprises an organometallic complex represented by a formula (G1-1),
wherein M represents Pt or Pd, and each of R 1 to R 16 independently represents any one of hydrogen, an alkyl group having 1 to 6 carbon atoms, and a substituted or unsubstituted aryl group having 6 to 13 carbon atoms,
wherein a ring A represents a triazole ring, and
wherein the light-emitting element emits green light.
2. The light-emitting element according to claim 1 ,
wherein when the ring A is represented by a formula (α), the foimula (α) is any one of a formula (α-1), a formula (α-2), a formula (α-3), and a formula (α-4) below,
wherein each of R 21 to R 28 independently represents any one of hydrogen, an alkyl group having 1 to 6 carbon atoms, and a substituted or unsubstituted aryl group having 6 to 13 carbon atoms.
3. The light-emitting element according to claim 1 , wherein the organometallic complex is represented by a formula (100) below.
4. The light-emitting element according to claim 1 ,
wherein the light-emitting layer comprises a guest material and a host material, and
wherein the guest material is the organometallic complex represented by the formula (G1-1).
5. A light-emitting device comprising:
the light-emitting element according to claim 1 ; and
any one of a transistor and a substrate.
6. An electronic device comprising:
the light-emitting device according to claim 5 ; and
any one of a microphone, a camera, an operation button, an external connection portion, and a speaker.
7. An electronic device comprising:
the light-emitting device according to claim 5 ; and
a housing or a touch sensor.
8. A lighting device comprising:
the light-emitting device according to claim 5 ; and
any one of a housing, a cover, and a support.
9. The light-emitting element according to claim 4 ,
wherein the host material has higher triplet excitation energy than the guest material.
10. The light-emitting element according to claim 4 ,
wherein the host material comprises a n-electron deficient heteroaromatic compound.
11. The light-emitting element according to claim 4 ,
wherein the host material comprises a n-electron rich heteroaromatic compound.
12. The light-emitting element according to claim 4 ,
wherein the host material comprises an aromatic amine compound.