The present application relates to compounds of formula (I) or (II) [Expression Ar 1 is an aryl or heteroaryl group, in each case identical or different, having 6 to 18 aromatic ring atoms and which may be substituted with one or more R 1 radicals; Ar 2 is in each case the same or different and is an aryl or heteroaryl group having 6 aromatic ring atoms and which may be substituted with one or more R 2 radicals; X 1 is the same or different in each case, BR 3, C (R 3 ) 2, -C (R 3) 2 -C (R 3) 2 -, -C (R 3) 2 -O-, -C (R 3 ) 2 -S, -R 3 C═CR 3 -, -R 3 C═N-, Si (R 3 ) 2 , Ge (R 3 ) 2 , -Si (R 3 ) 2 -Si 3 ) 2 -, C═O, O, S, Se, S═O, SO 2 , NR 3 , PR 3 or P (═O) R 3 wherein two or more R 3 radicals may be connected to one another, Lt; RTI ID = 0.0 (I) or (II) suitable for use as a functional material in electronic devices, particularly as a radiator material in organic electroluminescent devices.
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