Organic Electroluminescent Devices

An organic electroluminescent device comprising cathode, anode and at least one organic layer comprising at least one compound of formula (1)

• Ar1—X—Ar2—Ar3 Formula (1)
• wherein
• Ar1 and Ar3 is, identically or differently on each occurrence, an aromatic or heteroaromatic ring system optionally substituted by one or more R;
• Ar2 is, identically or differently on each occurrence, a fused aryl or heteroaryl group having at least 14 aromatic ring atoms optionally substituted by one or more R;
• X is on each occurrence O, S, Se, or Te;
• R is, identically or differently on each occurrence, H, F, Cl, Br, I, a straight-chain alkyl, alkoxy, or thioalkoxy chain having up to 40 C atoms and optionally substituted by R1, or a branched or cyclic alkyl, alkoxy, or thioalkoxy chain having 3 to 40 C atoms and optionally substituted by R1, wherein one or more non-adjacent C atoms is optionally replaced by N-R1, O, S, O—CO—O, CO—O, Si(R1)2, CO, CO—N(R1)2, —CR1═CR1-, or -C≡C-, and wherein one or more H atoms is optionally replaced by F, Cl, Br, I, CN, or an aromatic or heteroaromatic ring system optionally substituted by one or more R1, 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;
• R1 is, identically or differently on each occurrence, H or an aliphatic or aromatic hydrocarbon radical having up to 20 C atoms;
• with the proviso that no more than one of Ar1, Ar2 and Ar3 is anthracene and with the proviso that if Ar2 is anthracene, Ar1-X is not bonded in the 2-position.

An organic electronic device comprising one or more compounds of formula (1)

• Ar1—X—Ar2—Ar3 Formula (1)
• wherein
• Ar1 and Ar3 is, identically or differently on each occurrence, an aromatic or heteroaromatic ring system optionally substituted by one or more R;
• Ar2 is, identically or differently on each occurrence, a fused aryl or heteroaryl group having at least 14 aromatic ring atoms optionally substituted by one or more R;
• X is on each occurrence O, S, Se, or Te;
• R is, identically or differently on each occurrence, H, F, Cl, Br, I, a straight-chain alkyl, alkoxy, or thioalkoxy chain having up to 40 C atoms and optionally substituted by R1, or a branched or cyclic alkyl, alkoxy, or thioalkoxy chain having 3 to 40 C atoms and optionally substituted by R1, wherein one or more non-adjacent C atoms is optionally replaced by N-R1, O, S, O—CO—O, CO—O, Si(R1)2, CO, CO-N(R1)2, -CR1═CR1-, or -C≡C-, and wherein one or more H atoms is optionally replaced by F, Cl, Br, I, CN, or an aromatic or heteroaromatic ring system optionally substituted by one or more R1, 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;
• R1 is, identically or differently on each occurrence, H or an aliphatic or aromatic hydrocarbon radical having up to 20 C atoms;
• with the proviso that no more than one of Ar1, Ar2 and Ar3 is anthracene and with the proviso that if Ar2 is anthracene, Ar1-X is not bonded in the 2-position;
• and
• wherein said device is selected from the group consisting of organic field-effect transistors, organic thin-film transistors, organic light-emitting transistors, organic integrated circuits, organic solar cells, organic field-quench devices, and organic laser diodes

A compound of formula (1a)

• Ar1—X—Ar2—Ar3 Formula (1a)
• wherein
• Ar1 and Ar3 is, identically or differently on each occurrence, an aromatic or heteroaromatic ring system optionally substituted by one or more R, wherein at least one of Ar1 and Ar3 contains a fused aryl or heteroaryl group or a spirobifluorene;
• Ar2 is, identically or differently on each occurrence, a fused aryl or heteroaryl group having at least 14 aromatic ring atoms optionally substituted by one or more R;
• X is on each occurrence O, S, Se, or Te;
• R is, identically or differently on each occurrence, H, F, Cl, Br, I, a straight-chain alkyl, alkoxy, or thioalkoxy chain having up to 40 C atoms and optionally substituted by R1, or a branched or cyclic alkyl, alkoxy, or thioalkoxy chain having 3 to 40 C atoms and optionally substituted by R1, wherein one or more non-adjacent C atoms is optionally replaced by N-R1, O, S, O—CO—O, CO—O, Si(R1)2, CO, CO—N(R1)2, -CR1═CR1-, or -C—C-, and wherein one or more H atoms is optionally replaced by F, Cl, Br, I, CN, or an aromatic or heteroaromatic ring system optionally substituted by one or more R1, 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;
• R1 is, identically or differently on each occurrence, H or an aliphatic or aromatic hydrocarbon radical having up to 20 C atoms;
• with the proviso that no more than one of Ar1, Ar2, and Ar3 is anthracene and with the proviso that if Ar2 is anthracene, Ar-X is not bonded in the 2-position.