| 主权项 |
1. An organic electroluminescent device comprising, in this sequence, an anode, a first emitter layer, a second emitter layer which is a blue-emitting layer, where the blue-emitting layer is a fluorescent layer and comprises a host material in a proportion of 90-99.9% by vol. and a dopant in a proportion of 0.1-10% by vol., and a cathode, wherein the dopant has an HOMO of less than −5.3 eV and wherein the host material for the blue dopant is oligoarylenes, and
the blue dopant is a compound of the following formula (1):where the following applies to the symbols and indices used:
Ar1, Ar2, Ar3 are on each occurrence, identically or differently, an aryl or heteroaryl group having 6 to 22 aromatic ring atoms, which may be substituted by one or more radicals R1; X is on each occurrence, identically or differently, a group selected from BR2, C(R2)2, Si(R2)2, C═O, C═NR2, C═C(R2)2, O, S, S═O, SO2, NR2, PR2, P(═O)R2 or P(═S)R2; R1 and R2 are on each occurrence, identically or differently, H, D, F, Cl, Br, I, C(═O)Ar4, P(═O)(Ar4)2, S(═O)Ar4, S(═O)2Ar4, CR2═CR2Ar4, CHO, CR3═C(R3)2, CN, NO2, Si(R3)3, B(OR3)2, B(R3)2, B(N(R3)2)2, OSO2R3, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 C atoms or a straight-chain alkenyl or alkynyl group having 2 to 40 C atoms or a branched or cyclic alkyl, alkenyl, alkynyl, alkoxy or thioalkoxy group having 3 to 40 C atoms, each of which may be substituted by one or more radicals R3, where in each case one or more non-adjacent CH2 groups may be replaced by R3C═CR3, C≡C, Si(R3)2, Ge(R3)2, Sn(R3)2, C═O, C═S, C═Se, C═NR3, P(═O)R3, SO, SO2, NR3, O, S or CONR3 and where one or more H atoms may be replaced by F, Cl, Br, I, CN or NO2, or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which may in each case be substituted by one or more radicals R3; R3 is on each occurrence, identically or differently, H, D or an aliphatic or aromatic hydrocarbon radical having 1 to 20 C atoms; Ar4 is on each occurrence, identically or differently, an aromatic or heteroaromatic ring system having 5-30 aromatic ring atoms, which may be substituted by one or more non-aromatic radicals R1; two radicals Ar on the same nitrogen or phosphorus atom may also be linked to one another here by a single bond or a bridge X; in and n are 0 or 1, with the proviso that m+n=1; p is 1; Ar1, Ar2 and X together form a five-membered ring or a six-membered ring, and Ar2, Ar3 and X together form a five-membered ring or a six-membered ring; the sum of all π electrons in groups Ar1, Ar2 and Ar3 is at least 28 and the compound of the formula (1) contains no diarylamino group at least one of Ar1 to Ar3 is a fused aromatic system wherein at least one of the aromatic rings is directly fused to at least three other rings. |
