Light-emitting electrochemical cell, composition for forming light-emitting layer of light-emitting electrochemical cell, and ionic compound for light-emitting layer of light-emitting electrochemical cell

Patent metadata

Field	Value
Publication number	US-10930872-B2
Application number	US-201615767927-A
Country	US
Kind code	B2
Filing date	Nov 8, 2016
Priority date	Nov 30, 2015
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

A light-emitting electrochemical cell has a light-emitting layer and electrodes and disposed on the respective surface thereof. The light-emitting layer includes an organic polymeric light-emitting material and an ionic compound represented by the general formula (1). The ring A 1 denotes an aromatic ring; X is S, C or P; R 1 denotes R′ or OR′, and R′ denotes an alkyl group; n denotes 0 or 1; B denotes O, OR 2 or A 2 , R 2 denotes a saturated hydrocarbon group, and A 2 denotes an aromatic ring; the bond a is a single bond or a double bond; the bond a between B and X is a double bond and B is O; when X is P, the bond a between B and X is a single bond and B is OR 2 or A 2 ; d is 1 or more; and Y + denotes a cation.

First claim

The invention claimed is:

1. A light-emitting electrochemical cell, having: a light-emitting layer; and an electrode disposed on each surface of the light-emitting layer,
wherein the light-emitting layer comprises a light-emitting material and an ionic compound; and
the ionic compound is represented by the following general formula (1):

wherein the ring A 1 denotes an aromatic ring;
X denotes a sulfur atom, a carbon atom or a phosphorus atom;
R 1 denotes R′ or OR′, and R′ denotes an alkyl group;
n denotes 0 or 1;
B denotes an oxygen atom, OR′ or A 2 , R 2 denotes a saturated hydrocarbon group, and A 2 denotes an aromatic ring which may be identical with or different from the ring A 1 in the formula;
the bond a is a single bond or a double bond;
when X is a carbon atom, n is 0;
when X is a sulfur atom, n is 0 or 1, and when n is 1, the bond a between B and X is a double bond and B is an oxygen atom;
when X is a phosphorus atom, n is 1, and in this case, the bond a between B and X is a single bond and B is OR 2 or A 2 ;
d is 1 or more and is the number of substitutable positions in the ring A′, and when d is 2 or more, a plurality of R 1 present may be identical or different; and
Y + denotes a phosphonium cation.

2. The light-emitting electrochemical cell according to claim 1 , wherein the number of carbon atoms of the alkyl group represented by R′ is 1 or larger and 12 or smaller; and d is 1 or more and 9 or less.

3. The light-emitting electrochemical cell according to claim 1 , wherein X is a sulfur atom; and n is 1.

4. The light-emitting electrochemical cell according to claim 1 , wherein the light-emitting material is an organic polymeric light-emitting material being a polymer of para-phenylene vinylene, fluorene, 1,4-phenylene, thiophene, pyrrole, para-phenylene sulfide, benzothiazole, biothiophene or a derivative thereof, or a copolymer containing these.

5. The light-emitting electrochemical cell according to claim 1 , wherein the light-emitting material comprises, as a luminous substance, at least one or two or more selected from metal complexes, organic low-molecular materials and quantum dot materials.

6. A light-emitting electrochemical cell, using, as a material for forming a light-emitting layer, a composition comprising an ionic compound represented by the following general formula (1), a light-emitting material and a solvent:

wherein the ring A 1 denotes an aromatic ring;
X denotes a sulfur atom, a carbon atom or a phosphorus atom;
R 1 denotes R′ or OR′, and R′ denotes an alkyl group;
n denotes 0 or 1;
B denotes an oxygen atom, OR 2 or A 2 , R 2 denotes a saturated hydrocarbon group, and A 2 denotes an aromatic ring which may be identical with or different from the ring A1 in the formula;
the bond a is a single bond or a double bond;
when X is a carbon atom, n is 0;
when X is a sulfur atom, n is 0 or 1, and when n is 1, the bond a between B and X is a double bond and B is an oxygen atom;
when X is a phosphorus atom, n is 1, and in this case, the bond a between B and X is a single bond and B is OR 2 or A 2 ;
d is 1 or more and is the number of substitutable positions in the ring A 1 , and when d is 2 or more, a plurality of R 1 present may be identical or different; and
Y + denotes a phosphonium cation.

Assignees

• Nippon Chemical Ind

Inventors

• Yonekawa Fumihiro
• Mizuguchi Yohei

Classifications

• C09K11/06 Primary

  containing organic luminescent materials · CPC title

• H10K50/135

  comprising mobile ions · CPC title

• H10K85/10 Primary

  Organic polymers or oligomers · CPC title

• H10K85/151

  Copolymers · CPC title

• F21K2/08

  activated by an electric field, i.e. electrochemiluminescence · CPC title