Patent ID: 8124249

Claim:
A compound of formula (1) wherein Ar 1 and Ar 3 are, identically or differently on each occurrence, an aromatic or heteroaromatic ring system having 6 to 40 aromatic ring atoms, optionally substituted by one or more radicals R; Ar 2 is, identically or differently on each occurrence, selected from the group consisting of anthracene, acridine, phenanthrene, pyrene, naphthacene, chrysene, pentacene, and perylene, wherein said anthracene, acridine, phenanthrene, pyrene, naphthacene, chrysene, pentacene, and perylene are optionally substituted by R, with the proviso that Ar 1 and Ar 3 are not linked to Ar 2 via adjacent positions or peri-positions; L 1 and L 2 are, identically or differently on each occurrence, a divalent organic bridge containing up to 60 C atoms, optionally substituted by one or more radicals R; R is, identically or differently on each occurrence, H; F; Cl; Br; I; CN; NO 2 ; COOR 1 ; B(OR 1 ) 2 ; B(R 1 ) 2 ; Si(R 1 ) 3 ; a straight-chain alkyl or alkoxy having up to 40 C atoms; a branched or cyclic alkyl or alkoxy having 3 to 40 C atoms, optionally substituted by R 1 , wherein one or more non-adjacent C atoms of said straight-chain alkyl or alkoxy or said branched or cyclic alkyl or alkoxy are optionally replaced by N—R 1 , O, S, O—CO—O, CO—O, —CR 1 ═CR 1 —, or —C≡C—, and wherein one or more H atoms of said straight-chain alkyl or alkoxy or said branched or cyclic alkyl or alkoxy are optionally replaced by F, Cl, Br, I, or CN; or an aromatic or heteroaromatic ring system having 5 to 40 aromatic ring atoms, optionally substituted by one or more radicals R 1 ; or a combination of two, three or four of these systems; and wherein two or more R optionally define a further mono- or polycyclic, aliphatic or aromatic ring system; R 1 is, identically or differently on each occurrence, H or an aliphatic or aromatic hydrocarbon radical having up to 20 C atoms; wherein two or more R 1 optionally define a ring system; x is, identically or differently on each occurrence, 0 or 1, wherein when x is 0, L 2 is not present.