Patent ID: 8679647

Claim:
An organic electroluminescent device comprising an anode, a cathode and at least one emitting layer which comprises at least one fluorescent emitter, or at least one emitting layer which comprises at least one phosphorescent emitter and which is employed in combination with a hole-blocking layer, wherein an electron-transport layer which comprises at least one compound of the formula (1) or formula (2): where the following applies to the symbols and indices used: Ar is a group of the following formula (3): where the dashed bond indicates the bond to the spirobifluorene; Ar 1 is a group of the following formula (4): where the dashed bonds indicate the bonds to the spirobifluorene; R 1 and R 2 are on each occurrence, identically or differently, H, D, F, Cl, Br, I, CHO, N(R 3 ) 2 , N(Ar 1 ) 2 , B(Ar 1 ) 2 , C(═O)Ar 1 , P(═O)(Ar 1 ) 2 , S(═O)Ar 1 , S(═O) 2 Ar 1 , CR 3 ═CR 3 Ar 1 , CN, NO 2 , Si(R 3 ) 3 , B(OR 3 ) 2 , B(R 3 ) 2 , B(N(R 3 ) 2 ) 2 , OSO 2 R 3 , a straight-chain alkyl, alkenyl, alkynyl, alkoxy or thioalkoxy group having 1to 40 C atoms or a branched or cyclic alkyl, alkenyl, alkynyl, alkoxy or thioalkoxy group having 3 to 40 C atoms, each of which is optionally substituted by one or more radicals R 3 , where one or more non-adjacent CH 2 groups is optionally replaced by R 3 C═CR 3 , C≡C, Si(R 3 ) 2 , Ge(R 3 ) 2 , Sn(R 3 ) 2 , C═O, C═S, C═Se, C═NR 3 , P(═O)(R 3 ), SO, SO 2 , NR 3 , O, S or CONR 3 and where one or more H atoms is optionally replaced by D, F, Cl, Br, I, CN or NO 2 , 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 R 3 , or an aryloxy or heteroaryloxy group having 5 to 60aromatic ring atoms, which is optionally substituted by one or more radicals R 3 , or a combination of these systems; two or more adjacent substituents R 1 here optionally forms a mono- or polycyclic, aliphatic or aromatic ring system with one another; Ar 1 is on each occurrence, identically or differently, an aromatic or heteroaromatic ring system having 5 to 30 aromatic ring atoms, which is optionally substituted by one or more radicals R 3 ; two radicals Ar 1 here which are bonded to the same nitrogen, phosphorus or boron atom may also be linked to one another by a single bond or a bridge selected from B(R 3 ), C(R 3 ) 2 , Si(R 3 ) 2 , C═O, C═NR 3 , C═C(R 3 ) 2 , O, S, S═O, SO 2 , N(R 3 ), P(R 3 ) and P(═O)R 3 ; R 3 is on each occurrence, identically or differently, H, D or an aliphatic, aromatic and/or heteroaromatic hydrocarbon radical having 1 to 20 C atoms, in which, in addition, H atoms is optionally replaced by D or F; two or more adjacent substituents R 3 here may also form a mono- or polycyclic, aliphatic or aromatic ring system with one another; n is 0 or 1; m is 0, 1, 2 or 3; o is 0, 1, 2, 3 or 4 if n=0 in the same ring and is 0, 1, 2 or 3 if n=1 in the same ring, is introduced between the emitting layer or the hole-blocking layer and the cathode.