| abstract |
A compound of the formula, plus devices incorporating this compound, and a method of marking such devices: n n n n n n n n n n n n wherein: n A represents a phenyl group, a naphthyl group, a biphenyl group or two phenyl groups linked by a C 1 -C 8 alkyl chain; n B 1 and B 2 in each occurrence are independently selected side chains of the structuren n—(Y 1 ) n -L-(Y 2 ) m —Xn n wherein: n Y 1 and Y 2 in each occurrence are independently selected from O, CO 2 — and CH 2 O, n m and n in each occurrence are independently selected from 0 or 1; n L in each occurrence is a C 2 -C 14 straight chain alkyl group; and n X in each occurrence is an independently selected cross linkable group; n n n C is a side chain of the structure —(Z 1 ) p -M-(Z 2 ) q -En wherein: Z 1 and Z 2 are independently selected from O, CO 2 — and CH 2 O, p and q in each occurrence are independently selected from 0 or 1; M is a C 1 -C 14 straight chain alkyl group; and E comprises a charge transport group; D is a side chain of the structure —(W 1 ) r —N—(W 2 ) s —F wherein: W 1 and W 2 are independently selected from O, CO 2 — and CH 2 O, r and s in each occurrence are independently selected from 0 or 1; N is a C 1 -C 14 straight chain alkyl group; and F comprises a charge transport group or light emitter group; and wherein the charge transport group E does not contain a fluorene group other than those that form part of a spirobifluorenearylamine motif. |