Electroluminescence element

Patent metadata

Field	Value
Publication number	US-9935269-B2
Application number	US-201314434930-A
Country	US
Kind code	B2
Filing date	Oct 9, 2013
Priority date	Oct 10, 2012
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

Disclosed is an electroluminescence element, wherein at least a first electrode, a light-emitting layer, and a second electrode may be laminated on a substrate in said order. In said element, the light-emitting layer may contain quantum dots, and an intermediate layer formed from a polymer containing nitrogen atoms may be formed between the first electrode and the light-emitting layer.

First claim

The invention claimed is:

1. An electroluminescence element, comprising at least a first electrode, a light emitting layer, and a second electrode which are laminated on a substrate,
wherein the light emitting layer contains quantum dots and is disposed between the first electrode and the second electrode, and an intermediate layer including a nitrogen atom-containing polymer is disposed between the first electrode and the light emitting layer or between the light emitting layer and the second electrode,
wherein the intermediate layer is a hole blocking layer and the nitrogen atom-containing polymer is a hole-blocking material,
wherein the nitrogen atom-containing polymer has a structural unit represented by a general formula (A) (including a salt form) as a main chain,

wherein,
n represents 1 or 2, m represents 2 to 1000,
A1 represents a nitrogen atom, a carbon atom or a silicon atom,
L1 and L2 represent a bivalent linking group selected from an alkylene group having 1 to 20 carbon atoms, a cycloalkylene group having 3 to 20 carbon atoms, an arylene group having 6 to 30 carbon atoms, a heteroarylene group having 1 to 30 carbon atoms, a alkyleneoxy group having 1 to 20 carbon atoms, or a combination thereof, and
R1 and R2 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, or a substituted or unsubstituted heteroaryl group having 1 to 30 carbon atoms.

2. The electroluminescence element according to claim 1 , wherein the compound having a structural unit represented by the general formula (A) as a main chain is a neutral compound.

3. The electroluminescence element according to claim 1 , wherein
the structural unit represented by the general formula (A) is represented by a general formula (B),

wherein n represents 1 or 2, m represents 2 to 1000,
A2 represents a nitrogen atom, a carbon atom or a silicon atom,
Z1 and Z2 each independently represent —C(R3)=C(R4)-, —C(R5)=N—, —O—, or —S—,
L1 represents a bivalent linking group selected from an alkylene group having 1 to 20 carbon atoms, a cycloalkylene group having 3 to 20 carbon atoms, an arylene group having 6 to 30 carbon atoms, a heteroarylene group having 1 to 30 carbon atoms, an alkyleneoxy group having 1 to 20 carbon atoms, or a combination thereof, and
R1 to R5 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, or a substituted or unsubstituted heteroaryl group having 1 to 30 carbon atoms.

4. The electroluminescence element according to claim 3 , wherein, in the general formula (B), Z1 and Z2 each represent —CH═CH—.

5. The electroluminescence element according to claim 3 , wherein, in the general formula (B), A2 represents a carbon atom.

6. The electroluminescence element according to claim 3 , wherein, in the general formula (B), R1 and R2 both represent an alkyl group.

7. The electroluminescence element according to claim 1 , wherein the intermediate layer has a layer thickness in a range of 2 to 10 nm.

8. The electroluminescence element according to claim 1 , wherein the intermediate layer is formed between the first electrode and the light emitting layer.

9. The electroluminescence element according to claim 1 , wherein the light emitting layer contains at least one type of host compound and at least one type of quantum dot, and a light emitting maximum wavelength assigned to 0-0 transition band in a phosphorescence spectrum of the host material is in a wavelength region of 414 to 459 nm.

10. The electroluminescence element according to claim 9 , wherein the quantum dot has an average particle size in a range of 1 to 20 nm.

11. The electroluminescence element according to claim 9 , wherein the quantum dot includes Si, Ge, GaN, GaP, CdS, CdSe, CdTe, InP, InN, ZnS, In 2 S 3 , ZnO, CdO, CuInS, CuInSe, CuInGaSe or mixtures thereof.

12. The electroluminescence element according to claim 9 , wherein the host compound has a molecular weight of 500 to 1000.

13. The electroluminescence element according to claim 9 , wherein the host compound is represented by a general formula (1),

wherein X represents NR′, O, S, CR′R″, or SiR′R″,
y1 and y2 represent CR′ or N,
R′ and R″ each independently represent a hydrogen atom, a methyl group, an ethyl group, a propyl group, an isopropyl group, a t-butyl group, a pentyl group, a hexyl group, an octyl group, a dodecyl group, a tridecyl group, a tetradecyl group, a pentadecyl group, a cyclopentyl group, a cyclohexyl group, a vinyl group, an allyl group, ethynyl group, a propargyl group, a phenyl group, a p-chlorophenyl group, a mesityl group, a tolyl group, a xylyl group, a naphthyl group, an anthryl group, an azulenyl group, an acenaphthenyl group, a fluorenyl group, a phenanthryl group, an indenyl group, a pyrenyl group, a biphenylyl group, a pyridyl group, a pyrimidyl group, a furyl group, a pyrrolyl group, an imidazolyl group, a benzimidazolyl group, a pyrazolyl group, a pyrazinyl group, a 1,2,4-triazol-1-yl group, a 1,2,3-triazol-1-yl group, an oxazolyl group, a benzoxazolyl group, a thiazolyl group, an isooxazolyl group, an isothiazolyl group, a furazanyl group, a thienyl group, a quinolyl group, a benzofuryl group, a dibenzofuryl group, a benzothienyl group, a dibenzothienyl group, an indolyl group, a carbazolyl group, a carbolinyl group, a diazacarbazolyl group, a quinoxalinyl group, a pyridazinyl group, a triazynyl group, a quinazolinyl group, a phthalazinyl group, a heterocyclic group, an alkoxy group having 1-12 carbon atoms, a cyclopentyloxy group, a cyclohexyloxy group, a phenoxy group, a naphthyloxy group, a methylthio group, an ethylthio group, a propylthio group, a pentylthio group, a hexylthio group, an octylthio group, a dodecylthio group, a cyclopentylthio group, a cyclohexylthio group, a phenylthio group, a naphthylthio group, a methyloxycarbonyl group, an ethyloxycarbonyl group, a butyloxycarbonyl group, an octyloxycarbonyl group, a dodecyloxycarbonyl group, a phenyloxycarbonyl group, a naphthyloxycarbonyl group, an aminosulfonyl group, a methylaminosulfonyl group, a dimethylaminosulfonyl group, a butylaminosulfonyl group, a hexylaminosulfonyl group, a cyclohexylaminosulfonyl group, an octylaminosulfonyl group, a dodecylaminosulfonyl group, a phenylaminosulfonyl group, a naphthylaminosulfonyl group, a 2-pyridylaminosulfonyl group, an acetyl group, an ethylcarbonyl group, a propylcarbonyl group, a pentylcarbonyl group, a cyclohexylcarbonyl group, an octylcarbonyl group, a 2-ethylhexylcarbonyl group, a dodecylcarbonyl group, a phenylcarbonyl group, a naphthylcarbonyl group, a pyridylcarbonyl group, an acetyloxy group, an ethylcarbonyloxy group, a butylcarbonyloxy group, an octylcarbonyloxy group, a dodecylcarbonyloxy group, a phenylcarbonyloxy group, a methylcarbonylamino group, an ethylcarbonylamino group, a dimethylcarbonylamino group, a propylcarbonylamino group, a pentylcarbonylamino group, a cyclohexylcarbonylamino group, a

Assignees

• Konica Minolta Inc

Inventors

• Okubo Yasushi
• Ikemizu Dai
• Taka Hideo

Classifications

• H01L51/5044

  Electricity · mapped topic

• H01L51/5056

  Electricity · mapped topic

• H01L51/5206

  Electricity · mapped topic

• H01L51/0073

  Electricity · mapped topic

• 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