Organic electroluminescent device, thin luminous film, display apparatus, and lighting apparatus

Patent metadata

Field	Value
Publication number	US-10862048-B2
Application number	US-201515329823-A
Country	US
Kind code	B2
Filing date	Jul 30, 2015
Priority date	Jul 31, 2014
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

An organic electroluminescent device contains an anode, a cathode, and an organic layer containing at least one luminous layer. The organic layer is disposed between the anode and the cathode. At least one luminous layer contains a π-conjugated compound exhibiting no overlap between the electron density distributions of the HOMO and the LUMO in the molecule, such that electron transition between the HOMO and the LUMO occurs by a through-space interaction in the molecule. The π-conjugated compound has a π-conjugated aromatic ring at a moiety on which at least one of the HOMO and the LUMO is localized.

First claim

The invention claimed is:

1. An organic electroluminescent device comprising:
an anode;
a cathode; and
an organic layer comprising at least one luminous layer, the organic layer being disposed between the anode and the cathode, wherein
at least one of the at least one luminous layer comprises a π-conjugated compound exhibiting no overlap between the electron density distributions of the HOMO and the LUMO in the molecule, such that electron transition between the HOMO and the LUMO occurs by a through-space interaction in the molecule, and the π-conjugated compound has a π-conjugated aromatic ring at a moiety on which at least one of the HOMO and the LUMO is localized,
wherein the π-conjugated compound is at least one of compounds having structures represented by General formulae (1), (2), (3), and (5):

where R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 , R 18 , R 19 , and R 20 each independently represent a hydrogen atom or a substituent, and at least one of R 11 , R 12 , R 13 , and R 14 is represented by General formula (1-A):

where Y 11 represents a divalent linkage group, Z 1 represents an electron-donating aromatic hydrocarbon or heteroaromatic group, at least one of R 11 , R 12 , R 13 , and R 14 is represented by General formula (1-B) where Y 12 represents a divalent linkage group and Z 2 represents an electron-accepting aromatic hydrocarbon or heteroaromatic group, x represents an integer of 1, and p1and p2 each represent an integer of 0 or 1;

where X a and X b each independently represent an oxygen atom, a sulfur atom, or NR c , X 1 , X 2 , X 3 , X 4 , X 5 , and X 6 each independently represent a nitrogen atom or CR d and at least one of X 1 , X 2 , X 3 , X 4 , X 5 , and X 6 is a nitrogen atom, R c , R d , R 21 , R 22 , R 23 , R 24 , R 25 , and R 26 each independently represent a hydrogen atom or a substituent, L 1 , L 2 , L 3 , L 4 , L 5 , and L 6 each represent a divalent linkage group, and p and q each represent an integer of 0 or 1;

where X 31 represents PR b (═O), SO 2 , or SO, R b , R 31 , R 32 , R 33 , R 34 , R 35 , R 36 , R 37 , and R 38 each independently represent a hydrogen atom or a substituent, and at least one of R 31 , R 33 , R 36 , and R 38 is represented by General formula (3-A):

where Y 31 represents a divalent linkage group, Z 3 represents an electron-donating aromatic hydrocarbon or heteroaromatic group, and p3 represents an integer of 0 or 1; and

where R 51 , R 52 , R 53 , R 54 , R 55 , and R 56 each independently represent a hydrogen atom or a substituent, and Z 51 and Z 52 each independently represent an electron-donating aromatic hydrocarbon or heteroaromatic group or an electron-accepting aromatic hydrocarbon or heteroaromatic group, with the proviso that both Z 51 and Z 52 are not an electron-donating aromatic hydrocarbon or heteroaromatic group and that both Z 51 and Z 52 are not an electron-accepting aromatic hydrocarbon or heteroaromatic group.

2. The organic electroluminescent device according to claim 1 , wherein the π-conjugated compound exhibits a ΔEst of 0.5 eV or less where ΔEst represents the absolute value of the difference between the lowest excited singlet energy level and the lowest excited triplet energy level.

3. The organic electroluminescent device according to claim 1 , wherein the luminous layer comprises the π-conjugated compound and at least one of a fluorescent compound and a phosphorescent compound.

4. The organic electroluminescent device according to claim 1 , wherein the luminous layer comprises the π-conjugated compound, at least one of a fluorescent compound and a phosphorescent compound, and a host compound.

5. A display apparatus comprising the organic electroluminescent device according to claim 1 .

6. A lighting apparatus comprising the organic electroluminescent device according to claim 1 .

Assignees

• Konica Minolta Inc
• Merck Patent Gmbh

Inventors

• Oshiyama Tomohiro
• Kita Hiroshi
• Namikawa Taketo
• Okuyama Michihiro
• Hattori Tatsuya
• Miyata Yasuo

Classifications

• H10K85/6572 Primary

  comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole · CPC title

• H10K50/00

  Organic light-emitting devices (integrated devices or assemblies of multiple devices H10K59/00, H10K65/00; organic semiconductor lasers H01S5/36) · CPC title

• H10K50/11

  characterised by the electroluminescent [EL] layers · CPC title

• H05B33/20

  characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded · CPC title

• H05B33/14

  characterised by the chemical or physical composition or the arrangement of the electroluminescent material {, or by the simultaneous addition of the electroluminescent material in or onto the light source} · CPC title