Light emitting element, light emitting device, authentication device, and electronic device

1. A light emitting element comprising:

an anode;

a cathode; and

a light emitting layer that is provided between the anode and the cathode and that emits light having a wavelength of 700 nm or more in a near-infrared region by conducting current between the anode and the cathode,

wherein the light emitting layer includes a compound represented by one of the following formulas (2) to (6) as a light emitting material and a compound represented by the following formula IRH-1 as a host material for retaining the light emitting material

in the formulas (2) to (6), each R 1 independently represents an alkyl group or aryl group that has one to five carbon atoms, and each R 2 independently represents a hydrogen atom, or an alkyl group or aryl group that has one to five carbon atoms,

in the formula IRH-1, n represents a natural number from 1 to 12, and each R independently represents a hydrogen atom, an alkyl group, an aryl group that may have a substituent group, or an arylamino group.

2. The light emitting element according to claim 1 , wherein the host material is a compound represented by the following formula IRH-2

in the formula IRH-2, R 1 to R 4 independently represent a hydrogen atom, an alkyl group, an aryl group that may have a substituent group, or an arylamino group, and R 1 to R 4 may be the same as or different from each other.

3. The light emitting element according to claim 1 , wherein the host material is a compound represented by the following formula IRH-3

in the formula IRH-3, R 1 and R 2 independently represent a hydrogen atom, an alkyl group, an aryl group that may have a substituent group, or an arylamino group, and R 1 and R 2 may be the same as or different from each other.

4. The light emitting element according to claim 1 , wherein the host material is constituted by a carbon atom and a hydrogen atom.

5. The light emitting element according to claim 1 , wherein the light emitting material is contained in the light emitting layer in an amount of 0.25 wt % or more to 1.0 wt % or less.

6. The light emitting element according to claim 1 , comprising an electron transporting layer that is provided between the light emitting layer and the cathode and that includes a compound having an anthracene skeleton.

7. The light emitting element according to claim 6 , wherein the electron transporting layer includes a first electron transporting layer that includes an azaindolizine-based compound having an azaindolizine skeleton and an anthracene skeleton in a molecule thereof, and a second electron transporting layer that is provided between the first electron transporting layer and the light emitting layer and that includes an anthracene-based compound, the anthracene-based compound having an anthracene skeleton in a molecule thereof and being constituted by a carbon atom and a hydrogen atom.

8. The light emitting element according to claim 7 , wherein the second electron transporting layer is thicker than the first electron transporting layer.

9. The light emitting element according to claim 7 , wherein the second electron transporting layer has a thickness of 10 nm or more to 75 nm or less.

10. The light emitting element according to claim 6 , wherein the electron transporting layer has a thickness of 55 nm or more to 95 nm or less.

11. The light emitting element according to claim 1 , wherein the light emitting layer has a thickness of 10 nm or more to 50 nm or less.

12. A light emitting device, comprising the light emitting element according to claim 1 .

13. An authentication device, comprising the light emitting element according to claim 1 .

14. An electronic device, comprising the light emitting element according to claim 1 .