Fluorene containing copolymer used in light emitting devices

Patent metadata

Field	Value
Publication number	US-9676900-B2
Application number	US-201213982729-A
Country	US
Kind code	B2
Filing date	Jan 31, 2012
Priority date	Jan 31, 2011
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A polymer comprising a repeat unit of formula (I): (I) wherein Ar 6 and Ar 7 each independently represent a substituted or unsubstituted aryl or heteroaryl group; Sp represents a spacer group comprising a chain of at least 2 aliphatic carbon atoms spacing Ar 6 from Ar 7 ; m is at least 1; and if m is greater than 1 then —(Ar 7 )m forms a linear or branched chain of Ar 7 groups in which Ar 7 in each occurrence may be the same or different.

First claim

The invention claimed is:

1. A polymer comprising a repeat unit of formula (I):

wherein Ar 6 represents a substituted or unsubstituted aryl or heteroaryl group; Ar 7 is a group of formula (II):

wherein R 2 is H or a substituent and * indicates a point of attachment to Sp; Sp represents a spacer group comprising a chain of at least 2 aliphatic carbon atoms spacing Ar 6 from Ar 7 ; m is 1, and wherein the polymer further comprises a repeat unit of formula (V)

wherein Ar 1 and Ar 2 in each occurrence are independently substituted or unsubstituted aryl or heteroaryl groups, n is greater than or equal to 1, R is H or a substitutent, x and y are each independently 1, 2 or 3, and any two of groups Ar 1 , Ar 2 and R are optionally linked by a direct bond or a divalent linking group to form a ring.

2. A polymer according to claim 1 wherein Ar 6 is a substituted or unsubstituted fluorene.

3. A polymer according to claim 2 wherein the repeat unit of formula (I) has formula (Ia):

wherein R 1 is H or a substituent.

4. A polymer according to claim 3 wherein R 1 has the formula -Sp-(Ar 7 ) m .

5. A polymer according to claim 1 wherein Sp comprises a chain of at least 3 aliphatic carbon atoms spacing Ar 6 from Ar 7 .

6. A polymer according to claim 1 wherein Sp is a C 2-10 n-alkylene chain wherein one or more non-adjacent C atoms of the n-alkylene chain are optionally replaced with substituted or unsubstituted aryl or heteroaryl, O, S, substituted N, substituted Si, —C═O, or —COO—, and one or more H atoms of the n-alkylene chain are optionally replaced with C 1-5 alkyl, F, or an aryl or heteroaryl group.

7. An organic electronic device comprising a polymer according to claim 1 .

8. An organic electronic device according to claim 7 wherein the device is an organic light-emitting device comprising an anode, a cathode and a light-emitting layer between the anode and the cathode.

9. An organic electronic device according to claim 8 wherein the light-emitting layer comprises the polymer.

10. An organic electronic device according to claim 8 wherein the device further comprises a hole-transporting layer between the anode and the light-emitting layer.

11. An organic electronic device according to claim 10 wherein the hole-transporting layer comprises a polymer comprising a repeat unit of formula (I):

wherein Ar 6 represents a substituted or unsubstituted aryl or heteroaryl group; Ar 7 is a substituted or unsubstituted fluorene; Sp represents a spacer group comprising a chain of at least 2 aliphatic carbon atoms spacing Ar 6 from Ar 7 ; m is at least 1; and if m is greater than 1 then —(Ar 7 ) m forms a linear or branched chain of Ar 7 groups in which Ar 7 in each occurrence is the same or different.

Assignees

• Heidenhain Sophie Barbara
• Roberts Matthew
• Cass Michael
• Conway Natasha M J
• Jakobsson Fredrik
• Cambridge Display Tech Ltd
• Sumitomo Chemical Co

Inventors

• Heidenhain Sophie Barbara
• Roberts Matthew
• Cass Michael
• Conway Natasha M J
• Jakobsson Fredrik

Classifications

• C07C25/24

  Halogenated aromatic hydrocarbons with unsaturated side chains · CPC title

• C08G2261/95

  Use in organic luminescent diodes · CPC title

• C08G2261/1412

  Saturated aliphatic units · CPC title

• C08G2261/512

  Hole transport · CPC title

• C08G61/12

  Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule · CPC title