Aryl-substituted polyindenofluorenes for use in organic electroluminiscent devices
View Patent ↗The invention relates to organic semiconductive polymers comprising a new backbone system, monomers for the preparation of such polymers, methods for the preparation of such polymers and the use of such polymers in organic optoelectronic devices.
1. A polymer comprising optionally substituted first repeat units of formula (I):
wherein
* indicates the position that formula (I) is bonded to the polymer chain,
wherein R 1 , R 2 , R 3 and R 4 are selected from alkyl, alkyloxy, aryl, aryloxy, heteroaryl or heteroaryloxy groups, and R 1 and R 2 and/or R 3 and R 4 may be linked to form a monocyclic or polycyclic, aliphatic or aromatic ring system, provided that at least one of R 1 , R 2 , R 3 and R 4 is an aryl group.
2. A polymer according to claim 1 wherein at least two of R 1 , R 2 , R 3 and R 4 are an aryl group.
3. A polymer according to claim 2 wherein said aryl group is a 4-octylphenyl group or a 4-tert-butyl-phenyl group.
4. A polymer according to claim 1 wherein at least three of R 1 , R 2 , R 3 and R 4 are an aryl group.
5. A polymer according to claim 1 wherein R 1 , R 2 , R 3 and R 4 are an aryl group.
6. A polymer according to claim 1 wherein R 1 and R 2 are an aryl group and R 3 and R 4 are an alkyl group.
7. A polymer according to claim 6 , wherein said aryl group is an optionally substituted phenyl group.
8. A polymer according to claim 1 comprising a second repeat unit.
9. A polymer according to claim 8 wherein said second repeat unit is selected from the group consisting of triarylamines and heteroaromatics.
10. A switching device comprising the polymer according to claim 9 .
11. An organic light emitting device comprising the polymer according to claim 1 .
12. A field effect transistor comprising an insulator having a first side and a second side; a gate electrode located on the first side of the insulator; a polymer according to claim 1 located on the second side of the insulator; and a drain electrode and a source electrode located on the polymer.
13. An integrated circuit comprising a field effect transistor according to claim 12 .
14. A photovoltaic cell comprising a polymer according to claim 1 .
15. A polymer according to claim 1 , wherein R 1 , R 2 , R 3 and R 4 are alkyl or aryl and wherein two or four of R 1 , R 2 , R 3 and R 4 are aryl.
16. A polymer according to claim 15 , wherein said aryl is a substituted aryl.
17. A polymer according to claim 15 , wherein said aryl is a substituted phenyl.
18. A polymer according to claim 15 , wherein said aryl is a 4-tert-butyl-phenyl group.