Organic electroluminescent element
View Patent ↗An organic electroluminescent element comprises: a pair of electrodes; and at least one organic compound layer between the pair of electrodes, said at least one organic compound layer comprising a light-emitting layer, wherein the organic luminescent element comprises at least one complex represented by formula (1): wherein M 11 represents a hexacoordinate transition metal ion, Y 11 represents a nitrogen atom or a substituted or unsubstituted carbon atom, L 11 represents a ligand, Q 11 and Q 12 each represents an atomic group for forming a nitrogen-containing heterocyclic ring, n 11 represents an integer of 1 to 3, n 12 represents an integer of 0 to 4, X 11 represents a counter ion, and n 13 represents an integer of 0 to 3.
1. An organic electroluminescent element comprising:
a pair of electrodes; and
at least one organic compound layer between the pair of electrodes, said at least one organic compound layer comprising a light-emitting layer,
wherein the light-emitting layer comprises
a light-emitting material; and
a host material that emits light in a quantity of 5% or less based on the total light emission of the entire element, wherein the host material comprises at least one complex represented by formula (1):
wherein M 11 represents a hexacoordinate transition metal ion, Y 11 represents a nitrogen atom or a substituted or unsubstituted carbon atom, L 11 represents a ligand, Q 11 and Q 12 each represents an atomic group for forming a nitrogen-containing heterocyclic ring, n 11 represents an integer of 1 to 3, n 12 represents an integer of 0 to 4, X 11 represents a counter ion, and n 13 represents an integer of 0 to 3.
2. The organic electroluminescent element as claimed in claim 1 , wherein the complex represented by formula (1) is a complex represented by formula (2):
wherein M 21 represents a hexacoordinate transition metal ion, Y 21 to Y 27 each represents a nitrogen atom or a substituted or unsubstituted carbon atom, L 21 represents a ligand, n 21 represents an integer of 1 to 3, and n 22 represents an integer of 0 to 4.
3. The organic electroluminescent element as claimed in claim 2 ,
wherein M 21 is iridium;
Y 24 to Y 27 each represents a substituted or unsubstituted carbon atom;
Y 21 is unsubstituted carbon atom;
Y 22 is a substituted carbon atom;
Y 23 is nitrogen atom;
n 21 is an integer of 2 or 3;
n 22 is an integer of 0 or 1; and
L 21 is a bidentate nitrogen-containing heterocyclic ligand or diketone ligand.
4. The organic electroluminescent element as claimed in claim 2 ,
wherein M 21 is iridium;
Y 24 to Y 27 each represents a substituted or unsubstituted carbon atom;
Y 21 is unsubstituted carbon atom;
Y 22 is a substituted carbon atom;
Y 23 is nitrogen atom;
n 21 is an integer of 3; and
n 22 is an integer of 0.
5. The organic electroluminescent element as claimed in claim 1 , wherein the hexacoordinate transition metal ion is a trivalent iridium ion, a trivalent rhodium ion or a monovalent rhenium ion.
6. The organic electroluminescent element as claimed in claim 1 , wherein the amount of the complex represented by formula (1) in the light-emitting layer is from 70 mass % to 99.9 mass % of the total mass of the light-emitting layer.
7. The organic electroluminescent element as claimed in claim 6 , wherein the amount of the complex represented by formula (1) in the light-emitting layer is from 80 mass % to 99.9 mass % of the total mass of the light-emitting layer.