LIGHT EMITTING DEVICE

• US 20200136062A1
• Filed: 04/20/2018
• Published: 04/30/2020
• Est. Priority Date: 04/27/2017
• Status: Active Grant

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: SASADA, Toshiaki, OKAMURA, Rei
• Granted Patent: US 11,588,119 B2
• Time in Patent Office: Days
• CPC Class Codes: C07F 15/0033 Iridium compounds
• CPC Class Codes: C08G 2261/12 Copolymers
• CPC Class Codes: C08G 2261/122 statistical
• CPC Class Codes: C08G 2261/135 Cross-linked structures
• CPC Class Codes: C08G 2261/1412 Saturated aliphatic units
• CPC Class Codes: C08G 2261/1414 Unsaturated aliphatic units
• CPC Class Codes: C08G 2261/1424 containing ether groups, including alkoxy
• CPC Class Codes: C08G 2261/1426 containing carboxy groups (COOH) and/or -C(=O)O-moieties
• CPC Class Codes: C08G 2261/148 Side-chains having aromatic units
• CPC Class Codes: C08G 2261/1522 of alkali metals or alkaline-earth metals
• CPC Class Codes: C08G 2261/3142 fluorene-based, e.g. fluorene, indenofluorene, or spirobifluorene
• CPC Class Codes: C08G 2261/3162 Arylamines
• CPC Class Codes: C08G 2261/411 Suzuki reactions
• CPC Class Codes: C08G 2261/51 Charge transport
• CPC Class Codes: C08G 2261/514 Electron transport
• CPC Class Codes: C08G 2261/52 Luminescence
• CPC Class Codes: C08G 2261/76 crosslinking
• CPC Class Codes: C08G 2261/95 Use in organic luminescent diodes
• CPC Class Codes: C08G 61/10 only aromatic carbon atoms, e.g. polyphenylenes
• CPC Class Codes: C08G 61/12 Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule
• CPC Class Codes: C09D 165/00 : Coating compositions based on macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain C09D107/00 - C09D157/00, C09D161/00 take precedence; Coating compositions based on derivatives of such polymers
• CPC Class Codes: C09K 11/06 : containing organic luminescent materials
• CPC Class Codes: C09K 2211/1029 : containing one nitrogen atom as the heteroatom
• CPC Class Codes: C09K 2211/185 : of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd
• CPC Class Codes: H10K 2101/10 : Triplet emission
• CPC Class Codes: H10K 50/11 : characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/15 : Hole transporting layers
• CPC Class Codes: H10K 50/16 : Electron transporting layers
• CPC Class Codes: H10K 50/17 : Carrier injection layers
• CPC Class Codes: H10K 50/171 : Electron injection layers
• CPC Class Codes: H10K 85/115 : Polyfluorene; Derivatives thereof
• CPC Class Codes: H10K 85/151 : Copolymers
• CPC Class Codes: H10K 85/342 : comprising iridium
• CPC Class Codes: H10K 85/624 : containing six or more rings
• CPC Class Codes: H10K 85/633 : comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom
• CPC Class Codes: H10K 85/6572 : comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
• CPC Class Codes: H10K 85/6574 : comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes
• CPC Class Codes: H10K 85/6576 : comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene

Abstract

A light emitting device having excellent luminance life contains an anode, a cathode, a first organic layer disposed between the anode and the cathode and a second organic layer disposed between the anode and the cathode. The first organic layer contains a compound represented by the formula (C-1), and the second organic layer contains a compound represented by the formula (C-1) and a cross-linked body of a crosslinkable material.

Ring R^1C and Ring R^2C represent an aromatic hydrocarbon ring or an aromatic hetero ring and R^C represents an oxygen atom, a sulfur atom or a group represented by the formula (C′-1).

Ring R^3C and Ring R^4C represent an aromatic hydrocarbon ring or an aromatic hetero ring and R^C′ represents a carbon atom, a silicon atom, a germanium atom, a tin atom or a lead atom.

Claims

1. A light emitting device comprising

an anode,

a cathode,

a first organic layer disposed between the anode and the cathode, and

a second organic layer disposed between the anode and the cathode, wherein

the first organic layer contains a compound represented by the formula (C-1), and

the second organic layer contains a compound represented by the formula (C-1) and a cross-linked body of a crosslinkable material:

2. The light emitting device according to claim 1, wherein at least one of said compound represented by the formula (C-1) contained in said first organic layer and said compound represented by the formula (C-1) contained in said second organic layer is a compound represented by the formula (C-2-1) or a compound represented by the formula (C-2-2):

3. The light emitting device according to claim 2, wherein at least one of said compound represented by the formula (C-1) contained in said first organic layer and said compound represented by the formula (C-1) contained in said second organic layer is a compound represented by the formula (C-2-1), and

said compound represented by the formula (C-2-1) is a compound represented by the formula (C-3-1):

4. The light emitting device according to claim 2, wherein at least one of said compound represented by the formula (C-1) contained in said first organic layer and said compound represented by the formula (C-1) contained in said second organic layer is a compound represented by the formula (C-2-2), and

said compound represented by the formula (C-2-2) is a compound represented by the formula (C-3-2):

5. The light emitting device according to claim 1, wherein

said first organic layer further contains a phosphorescent compound represented by the formula (1):

6. The light emitting device according to claim 5, wherein said phosphorescent compound represented by the formula (1) is a phosphorescent compound represented by the formula (1-B):

7. The light emitting device according to claim 6, wherein said phosphorescent compound represented by the formula (1-B) is a phosphorescent compound represented by the formula (1-B1), a phosphorescent compound represented by the formula (1-B2), a phosphorescent compound represented by the formula (1-B3), a phosphorescent compound represented by the formula (1-B4) or a phosphorescent compound represented by the formula (1-B5):

8. The light emitting device according to claim 5, wherein said phosphorescent compound represented by the formula (1) is a phosphorescent compound represented by the formula (1-A):

9. The light emitting device according to claim 8, wherein said phosphorescent compound represented by the formula (1-A) is a phosphorescent compound represented by the formula (1-A1), a phosphorescent compound represented by the formula (1-A2), a phosphorescent compound represented by the formula (1-A3), a phosphorescent compound represented by the formula (1-A4) or a phosphorescent compound represented by the formula (1-A5):

10. The light emitting device according to claim 1, wherein said crosslinkable material is

a low molecular compound having at least one crosslinkable group selected from Group A of crosslinkable group or a polymer compound containing a crosslinkable constitutional unit having at least one crosslinkable group selected from Group A of crosslinkable group:

(Group A of crosslinkable group)

11. The light emitting device according to claim 10, wherein said crosslinkable material is a polymer compound containing a crosslinkable constitutional unit having at least one crosslinkable group selected from Group A of crosslinkable group, and

said crosslinkable constitutional unit is a constitutional unit represented by the formula (2) or a constitutional unit represented by the formula (2′

);

12. The light emitting device according to claim 10, wherein said crosslinkable material is a low molecular compound represented by the formula (3):

13. The light emitting device according to claim 1, wherein said first organic layer further contains at least one material selected from the group consisting of a hole transporting material, a hole injection material, an electron transporting material, an electron injection material and a light emitting material.

14. The light emitting device according to claim 1, wherein said first organic layer and said second organic layer are adjacent.

15. The light emitting device according to claim 1, wherein said second organic layer is a layer disposed between said anode and said first organic layer.