Organic electroluminescence element, lighting device and display device
View Patent ↗Disclosed is an organic electroluminescent device having high external quantum efficiency and long emission life. Also disclosed are an illuminating device and a display, each comprising such an organic electroluminescent device. The organic electroluminescent device is characterized by comprising at least an anode and a cathode on a supporting substrate, while having at least one light-emitting layer between the anode and the cathode. The organic electroluminescent device is also characterized by containing a polymer which at least partially contains a compound A having a partial structure represented by the general formula (a) below and a reactive group, and is obtained by polymerizing the compound A through the reactive group. (In the formula, Ar1 and Ar2 respectively represent an aromatic ring.)
1. An organic electroluminescent element comprising:
a substrate having thereon an anode, a cathode, and at least one layer between the anode and the cathode, wherein
the at least one layer comprises at least one emission layer, and
the at least one layer comprises a compound A and a polymer prepared by polymerizing the compound A via a reactive group, provided that the compound A contains a partial structure represented by Formula (b) and the reactive group in the molecule:
wherein, Ar1 represents a carboline ring or a dibenzofuran ring, and
the reactive group is represented by any one of Formulas (3) to (5):
wherein R represents a hydrogen atom or a methyl group; and Q represents a divalent linking group represented by any one of Formulas (c), (d), and (e) or any one of the plural combinations of Formulas (c), (d), and (e):
wherein R 1 and R 2 each represent a hydrogen atom or a methyl group; and Cy represents a three membered or a four membered cyclic either group, provided that “n” is an interger of 0 to 2.
2. An organic electroluminescent element of claim 1 , wherein the compound A or the polymer prepared from the compound A is contained in the at least one emission layer.
3. An organic electroluminescent element of claim 1 , wherein the at least one emission layer contains the polymer and a phosphorescence-emitting dopant.
4. An organic electroluminescent element of claim 3 , wherein the polymer is a copolymer of the compound A and the phosphorescence-emitting dopant.
5. An organic electroluminescent element of claim 3 , wherein the phosphorescence-emitting dopant is an Ir complex.
6. An organic electroluminescent element of claim 3 , wherein the phosphorescence-emitting dopant exhibits a 0-0 transition band of 485 nm or less in a phosphorescence spectrum.
7. An organic electroluminescent element of claim 6 , wherein the phosphorescence-emitting dopant is a metal complex represented by Formula (1):
wherein Z is a hydrocarbon ring or a heterocylic ring provided with a substituent having a steric parameter (Es value) of −0.5 or less at least at one of the third positions from the nitrogen atom to which Z is bonded; A is a group of atoms necessary to form a five or six membered hydrocarbon or heterocyclic ring together with X—C; B is —C(R 01 )═C(R 02 )—, —N═C(R 02 )—, —C(R 01 )═N— or —N═N—, provided that R 01 and R 02 each are a hydrogen atom or a substituent; X 1 -L1-X 2 is a bidentate ligand, provided that X 1 and X 2 each are independently a carbon atom, a nitrogen atom or an oxygen atom and L1 is a group of atoms necessary to form the bidentate ligand together with X 1 and X 2 ; m1 is an integer of 1, 2 or 3; m2 is an integer of 0, 1 or 2, provided that m1+m2 is 2 or 3; and a central metal M1 is a metal of groups 8 to 10 in the periodic table.
8. An organic electroluminescent element of claim 1 , wherein the compound A or the polymer prepared from the compound A exhibits a 0-0 transition band of 460 nm or less in a phosphorescence spectrum.
9. An organic electroluminescent element of claim 1 , wherein the layer containing the compound A or the polymer prepared from the compound A is prepared by using a wet coating method.
10. An organic electroluminescent element of claim 1 , wherein the compound A is polymerized after being coated.
11. An organic electroluminescent element of claim 1 , wherein the at least one layer comprises a plurality of organic layers.
12. An organic electroluminescent element of claim 1 , wherein
the at least one layer comprises at least one anode buffer layer, or at least one cathode buffer layer,
the at least one emission layer comprises a plurality of emission layers and one of the emission layers contains the compound A or the polymer of the compound A, and
the one of the emission layers is prepared by using a wet coating method.
13. An organic electroluminescent element of claim 1 , emitting a white light.
14. A display device comprising an organic electroluminescent element of claim 1 .
15. A lighting device comprising an organic electroluminescent element of claim 1 .