Spirobifluorene compounds for light emitting devices

A compound represented by any of the following formulae (1)-(12):

• wherein n, m and o may be the same or different and represent an integer of from 0 to 3, with the proviso that for a compound of formula (1) and (7) at least one of m or o is zero, each of the phenyl rings may carry no ligands other than L1 or may be substituted by ligands other than L1,
• L1, which may be the same or different at each position, has the formula A
• wherein
• R1 and R2 may be the same or different and represent hydrogen or an aliphatic group, a carbocyclic group, an aromatic group or a heterocyclic group, all of which may comprise 1 to 20 carbon atoms and all of which may be substituted or unsubstituted, or an OR3 group, a NR4R5 group or a SR6 group, wherein R3 to R6 represent hydrogen, an aliphatic group, a carbocyclic group, an aryl group, a heteroaryl group or a heterocyclic group having 1 to 20 carbon atoms, and
• Ar1 and Ar2, which may be the same or different, represent optionally substituted aromatic or heteroaromatic ring systems comprising 4 to 20 ring atoms.