US 7,494,720 B2
9-aryl and bisaryl substituted polyfluorenes
Jeremy Burroughes, Cambridgeshire (United Kingdom); Richard Friend, Cambridgeshire (United Kingdom); and Clare Foden, Cambridgeshire (United Kingdom)
Assigned to Cambridge Display Technology Limited, Cambridgeshire (United Kingdom)
Appl. No. 10/533,989
PCT Filed Nov. 04, 2003, PCT No. PCT/GB03/04753
§ 371(c)(1), (2), (4) Date Feb. 13, 2006,
PCT Pub. No. WO2004/041902, PCT Pub. Date May 21, 2004.
Claims priority of application No. 0225869.7 (GB), filed on Nov. 06, 2002.
Prior Publication US 2006/0228576 A1, Oct. 12, 2006
Int. Cl. H01L 51/54 (2006.01); C08G 61/00 (2006.01); C09K 11/06 (2006.01); H05B 33/14 (2006.01)
U.S. Cl. 428—690  [428/917; 313/504; 313/506; 257/40; 257/E51.032; 528/394; 528/397; 528/401; 528/422; 528/423] 17 Claims
 
1. A polymer comprising optionally substituted first repeat units of formula (I):

OG Complex Work Unit Drawing
wherein Ar is phenyl or oligophenyl substituted with at least one electron withdrawing group, said electron withdrawing group comprising at least one of a fluorine and a nitro group.