Multiple light-emitting element device each with varying wavelength
To provide a novel light-emitting device, a light-emitting device that emits light of a plurality of colors includes a first light-emitting element and a second light-emitting element. The first light-emitting element includes a first lower electrode, a first light-emitting layer over the first lower electrode, a second light-emitting layer over the first light-emitting layer, and an upper electrode over the second light-emitting layer. The second light-emitting element includes a second lower electrode, the first light-emitting layer over the second lower electrode, the second light-emitting layer over the first light-emitting layer, and the upper electrode over the second light-emitting layer. An emission spectrum of the first light-emitting layer peaks at a longer wavelength than an emission spectrum of the second light-emitting layer. A distance between the first lower electrode and the first light-emitting layer is shorter than a distance between the second lower electrode and the first light-emitting layer.
1. A light-emitting device comprising:
a first light-emitting element comprising:
a first lower electrode;
a first transparent conductive layer over the first lower electrode;
a first light-emitting layer over the first transparent conductive layer;
a charge-generation layer over the first light-emitting layer;
a second light-emitting layer over the charge-generation layer; and
an upper electrode over the second light-emitting layer,
a second light-emitting element comprising:
a second lower electrode;
a second transparent conductive layer over the second lower electrode;
the first light-emitting layer over the second transparent conductive layer;
the charge-generation layer over the first light-emitting layer;
the second light-emitting layer over the charge-generation layer; and
the upper electrode over the second light-emitting layer,
a third light-emitting element comprising:
a third lower electrode;
a third transparent conductive layer over the third lower electrode;
the first light-emitting layer over the third transparent conductive layer;
the charge-generation layer over the first light-emitting layer;
the second light-emitting layer over the charge-generation layer; and
the upper electrode over the second light-emitting layer, and
a fourth light-emitting element comprising:
a fourth lower electrode;
a fourth transparent conductive layer over the fourth lower electrode;
the first light-emitting layer over the fourth transparent conductive layer;
the charge-generation layer over the first light-emitting layer;
the second light-emitting layer over the charge-generation layer; and
the upper electrode over the second light-emitting layer,
wherein light emitted from the first light-emitting element has at least one peak in a wavelength range of greater than or equal to 400 nm and less than 480 nm,
wherein light emitted from the second light-emitting element has at least one peak in a wavelength range of greater than or equal to 550 nm and less than 600 nm,
wherein light emitted from the third light-emitting element has at least one peak in a wavelength range of greater than or equal to 600 nm and less than or equal to 740 nm, and
wherein light emitted from the fourth light-emitting element has at least one peak in a wavelength range of greater than or equal to 480 nm and less than 550 nm.
2. The light-emitting device according to claim 1 , wherein the first lower electrode, the second lower electrode, the third lower electrode, and the fourth lower electrode each comprise silver.
3. The light-emitting device according to claim 1 ,
wherein the first light-emitting layer includes a phosphorescent material, and
wherein the second light-emitting layer includes a fluorescent material.
4. An electronic device comprising:
the light-emitting device according to claim 1 ; and
a housing or a touch sensor.
5. A lighting device comprising:
the light-emitting device according to claims 1 ; and
a housing.
6. A light-emitting device comprising:
a first light-emitting element comprising:
a first lower electrode;
a first transparent conductive layer over the first lower electrode;
a first hole-injection layer over the first transparent conductive layer;
a first hole-transport layer over the first hole-injection layer;
a first light-emitting layer over the first hole-transport layer;
a first electron-transport layer over the first light-emitting layer;
a charge-generation layer over the first electron-transport layer;
a second light-emitting layer over the charge-generation layer; and
an upper electrode over the second light-emitting layer,
a second light-emitting element comprising:
a second lower electrode;
a second transparent conductive layer over the second lower electrode;
the first hole-injection layer over the second transparent conductive layer;
the first hole-transport layer over the first hole-injection layer;
the first light-emitting layer over the first hole-transport layer;
the first electron-transport layer over the first light-emitting layer;
the charge-generation layer over the first electron-transport layer;
the second light-emitting layer over the charge-generation layer; and
the upper electrode over the second light-emitting layer,
a third light-emitting element comprising:
a third lower electrode;
a third transparent conductive layer over the third lower electrode;
the first hole-injection layer over the third transparent conductive layer;
the first hole-transport layer over the hole-injection layer;
the first light-emitting layer over the first hole-transport layer;
the first electron-transport layer over the first light-emitting layer;
the charge-generation layer over the first electron-transport layer;
the second light-emitting layer over the charge-generation layer; and
the upper electrode over the second light-emitting layer, and
a fourth light-emitting element comprising:
a fourth lower electrode;
a fourth transparent conductive layer over the fourth lower electrode;
the first hole-injection layer over the fourth transparent conductive layer;
the first hole-transport layer over the first hole-injection layer;
the first light-emitting layer over the first hole-transport layer;
the first electron-transport layer over the first light-emitting layer;
the charge-generation layer over the first electron-transport layer;
the second light-emitting layer over the charge-generation layer; and
the upper electrode over the second light-emitting layer,
wherein light emitted from the first light-emitting element has at least one peak in a wavelength range of greater than or equal to 400 nm and less than 480 nm,
wherein light emitted from the second light-emitting element has at least one peak in a wavelength range of greater than or equal to 550 nm and less than 600 nm,
wherein light emitted from the third light-emitting element has at least one peak in a wavelength range of greater than or equal to 600 nm and less than or equal to 740 nm, and
wherein light emitted from the fourth light-emitting element has at least one peak in a wavelength range of greater than or equal to 480 nm and less than 550 nm.
7. The light-emitting device according to claim 6 , further comprising:
each of the first light-emitting element, the second light-emitting element, the third light-emitting element, and the fourth light-emitting element comprising:
a second hole-injection layer between the charge-generation layer and the second light-emitting layer;
a second hole-transport layer between second hole-injection layer and the second light-emitting layer; and
a second electron-transport layer between the second light-emitting layer and the upper electrode.
8. The light-emitting device according to claim 6 , wherein the first lower electrode, the second lower electrode, the third lower electrode, and the fourth lower electrode each comprise silver.
9. The light-emitting device according to claim 6 ,
wherein the first light-emitting layer includes a phosphorescent material, and
wherein the second light-emitting layer includes a fluorescent material.
10. An electronic device comprising:
the light-emitting device according to claim 6 ; and
a housing or a touch sensor.
11. A lighting device comprising:
the light-emitting device according to claims 6 ; and
a housing.
12. A light-emitting device comprising:
a first light-emitting element comprising:
a first lower electrode;
a first transparent conductive layer over the first lower electrode;
a first light-emitting layer over the first transparent conductive layer;
a charge-generation layer over the first light-emitting layer;
a hole-injection layer over the charge-generation layer;
a hole-transport layer over the hole-injection layer;
a second light-emitting layer over the hole-transport layer;
an electron-transport layer over second light-emitting layer; and
an upper electrode over the second light-emitting layer,
a second light-emitting element comprising:
a second lower electrode;
a second transparent conductive layer over the second lower electrode;
the first light-emitting layer over the second transparent conductive layer;
the charge-generation layer over the first light-emitting layer;
the hole-injection layer over the charge-generation layer;
the hole-transport layer over the hole-injection layer;
the second light-emitting layer over the hole-transport layer;
the electron-transport layer over second light-emitting layer; and
the upper electrode over the second light-emitting layer,
a third light-emitting element comprising:
a third lower electrode;
a third transparent conductive layer over the third lower electrode;
the first light-emitting layer over the third transparent conductive layer;
the charge-generation layer over the first light-emitting layer;
the hole-injection layer over the charge-generation layer;
the hole-transport layer over the hole-injection layer;
the second light-emitting layer over the hole-transport layer;
the electron-transport layer over second light-emitting layer; and
the upper electrode over the second light-emitting layer, and
a fourth light-emitting element comprising:
a fourth lower electrode;
a fourth transparent conductive layer over the fourth lower electrode;
the first light-emitting layer over the fourth transparent conductive layer;
the charge-generation layer over the first light-emitting layer;
the hole-injection layer over the charge-generation layer;
the hole-transport layer over the hole-injection layer;
the second light-emitting layer over the hole-transport layer;
the electron-transport layer over second light-emitting layer; and
the upper electrode over the second light-emitting layer,
wherein light emitted from the first light-emitting element has at least one peak in a wavelength range of greater than or equal to 400 nm and less than 480 nm,
wherein light emitted from the second light-emitting element has at least one peak in a wavelength range of greater than or equal to 550 nm and less than 600 nm,
wherein light emitted from the third light-emitting element has at least one peak in a wavelength range of greater than or equal to 600 nm and less than or equal to 740 nm, and
wherein light emitted from the fourth light-emitting element has at least one peak in a wavelength range of greater than or equal to 480 nm and less than 550 nm.
13. The light-emitting device according to claim 12 , wherein the first lower electrode, the second lower electrode, the third lower electrode, and the fourth lower electrode each comprise silver.
14. The light-emitting device according to claim 12 ,
wherein the first light-emitting layer includes a phosphorescent material, and
wherein the second light-emitting layer includes a fluorescent material.
15. An electronic device comprising:
the light-emitting device according to claim 12 ; and
a housing or a touch sensor.
16. A lighting device comprising:
the light-emitting device according to claims 12 ; and
a housing.