Light-emitting element
First Claim
1. A light-emitting element comprising:
- a light-emitting layer comprising a phosphorescent compound, a first organic compound, and a second organic compound,wherein the first organic compound and the second organic compound are configured to form an exciplex, andwherein an emission peak wavelength of the exciplex is longer than or equal to a peak wavelength of an absorption of a triplet metal to ligand charge transfer transition of the phosphorescent compound.
1 Assignment
0 Petitions
Accused Products
Abstract
A light-emitting element having high external quantum efficiency is provided. A light-emitting element having low drive voltage is provided. Provided is a light-emitting element which includes a light-emitting layer containing a phosphorescent compound, a first organic compound, and a second organic compound between a pair of electrodes. A combination of the first organic compound and the second organic compound forms an exciplex (excited complex). An emission spectrum of the exciplex overlaps with an absorption band located on the longest wavelength side of an absorption spectrum of the phosphorescent compound. A peak wavelength of the emission spectrum of the exciplex is longer than or equal to a peak wavelength of the absorption band located on the longest wavelength side of the absorption spectrum of the phosphorescent compound.
-
Citations
22 Claims
-
1. A light-emitting element comprising:
-
a light-emitting layer comprising a phosphorescent compound, a first organic compound, and a second organic compound, wherein the first organic compound and the second organic compound are configured to form an exciplex, and wherein an emission peak wavelength of the exciplex is longer than or equal to a peak wavelength of an absorption of a triplet metal to ligand charge transfer transition of the phosphorescent compound. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A light-emitting element comprising:
-
a light-emitting layer comprising a phosphorescent compound, a first organic compound, and a second organic compound, wherein the first organic compound and the second organic compound are configured to form an exciplex, wherein an emission peak wavelength of the exciplex is longer than or equal to a peak wavelength of an absorption of a triplet metal to ligand charge transfer transition of the phosphorescent compound, and wherein a difference between the emission peak wavelength of the exciplex and the peak wavelength of the absorption of the triplet metal to ligand charge transfer transition of the phosphorescent compound is 30 nm or less. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. A light-emitting element comprising:
-
a light-emitting layer comprising a phosphorescent compound, a first organic compound, and a second organic compound, wherein the first organic compound and the second organic compound are configured to form an exciplex, and wherein an emission peak wavelength of the exciplex is longer than or equal to a peak wavelength of an absorption of a triplet metal-to-ligand charge transfer transition of the phosphorescent compound and shorter than or equal to an emission peak wavelength of the phosphorescent compound. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
-
Specification