Composition for organic electronic devices

An emitting layer, an electron transport layer, an electron injection layer or a hole blocker layer comprising a composition comprising at least one compound of the formula (1k) and at least one compound of the formula (2e)

• where the symbols and indices used are as follows:
• Y is selected from O and S;
• RB is Ar3;
• Ar1, Ar2 at each instance are each independently are selected from Ar-1 to Ar-12
• Ar3 is an aromatic ring system having 6 to 40 aromatic ring atoms selected from Ar-2 to Ar-7
• R is the same or different at each instance and is selected from the group consisting of D, F, CN and an aryl group having 6 to 10 carbon atoms;
• R1 is the same or different at each instance and is selected from the group consisting of D, F, an alkyl group having 1 to 40 carbon atoms or an aromatic or heteroaromatic ring system which has 5 to 40 aromatic ring atoms;
• R3 is the same or different at each instance and is selected from the group consisting of H or D;
• R4 is D;
• R5 is the same or different at each instance and is D or phenyl;
• and
• Aryl is an aryl group containing 6 to 40 carbon atoms
• n and m at each instance are independently 0, 1, 2 or 3,
• o at each instance is independently 0, 1, 2, 3, 4, 5, 6 or 7;
• q at each instance is independently 0, 1, 2 or 3;
• p at each instance is independently 0, 1, 2, 3 or 4
• r and s are each independently 0, 1, 2, 3 or 4.