| abstract |
The present invention provides compounds having formula (I): In the formula: R 1 , R 1a , R 2 , R 2a are the same or different and are H, D, F, CN, alkyl, fluoroalkyl, aryl, heteroaryl, silyl, deuterated alkyl , deuterated partially fluorinated alkyl, deuterated aryl, deuterated heteroaryl, deuterated silyl, alkoxy, aryloxy, fluoroalkoxy, siloxane, siloxy, deuterium Deuterated alkoxy, deuterated aryloxy, deuterated fluoroalkoxy, deuterated siloxane or deuterated silyloxy , provided that at least one of R and R is heteroaryl or deuterated Heteroaryl; R 3 , R 3a , R 4 , R 4a , R 5 and R 6 are the same or different at each occurrence and are D, F, CN, alkyl, fluoroalkyl, aryl, heteroaryl , silyl, deuterated alkyl, deuterated partially fluorinated alkyl, deuterated aryl, deuterated heteroaryl, deuterated silyl, alkoxy, aryloxy, fluoroalkoxy, silicon Oxane, siloxy, deuterated alkoxy, deuterated aryloxy, deuterated fluoroalkoxy, deuterated siloxane or deuterated siloxy, wherein selected from R 3 , R 3a , R Adjacent groups of 4 and R can be joined together to form a fused ring ; R is the same or different at each occurrence and is an alkyl, aryl, or deuterated analog thereof, wherein two alkyl R 7 groups can be linked together to form a cycloalkylspiro ring, and wherein two R 7 phenyl groups can be linked together to form a spirocyclic fluorenyl; a and b are the same or different and are 0 or 1, provided that is a+b≧1; x is an integer of 0-3; y is an integer of 0-4; and z is an integer of 0-5. |