Light-emitting element, light-emitting device, light source, authentication device, and electronic apparatus
A light-emitting element according to the invention includes an anode, a cathode, and a light-emitting layer which is provided between the anode and the cathode, contains a light-emitting material and a host material that holds the light-emitting material, and emits light having a peak wavelength in a near-infrared region by applying a current between the anode and the cathode, wherein the content of the light-emitting material in the light-emitting layer is 30 wt % or more and 70 wt % or less. Further, it is preferred that the light-emitting layer emits light having the peak wavelength of 700 nm or more and 960 nm or less.
1. A light-emitting element, comprising:
an anode;
a cathode; and
a light-emitting layer which is provided between the anode and the cathode, contains a light-emitting material and a host material that holds the light-emitting material, and emits light having a peak wavelength in a near-infrared region by applying a current between the anode and the cathode,
wherein the content of the light-emitting material in the light-emitting layer is 30 wt % or more and 70 wt % or less, and
the light-emitting material contains at least one of a compound represented by the following general formula (IRD1) and a compound represented by the following formula IRD2-1:
wherein R each independently represents an aryl group, an arylamino group, triarylamine, or a group containing at least one of the derivatives thereof,
2. The light-emitting element according to claim 1 , wherein the compound represented by the general formula (IRD1) is a compound represented by the following formula IRD1-1:
3. A light-emitting device, comprising the light-emitting element according to claim 2 .
4. A light source, comprising the light-emitting element according to claim 2 .
5. An authentication device, comprising the light-emitting element according to claim 2 .
6. An electronic apparatus, comprising the light-emitting element according to claim 2 .
7. The light-emitting element according to claim 1 , wherein the host material contains a compound represented by the following formula IRH1:
wherein n represents a natural number of 1 to 12, and R each independently represents a hydrogen atom, an alkyl group, an aryl group which may have a substituent, or an arylamino group.
8. The light-emitting element according to claim 1 , wherein the light-emitting layer emits light having the peak wavelength of 700 nm or more and 960 nm or less.
9. The light-emitting element according to claim 1 , wherein the content of the light-emitting material in the light-emitting layer is 50 wt % or more and 70 wt % or less.
10. A light-emitting device, comprising the light-emitting element according to claim 1 .
11. A light source, comprising the light-emitting element according to claim 1 .
12. An authentication device, comprising the light-emitting element according to claim 1 .
13. An electronic apparatus, comprising the light-emitting element according to claim 1 .