Organic Light Emitting Diode, Device Comprising the Same as and Compound for Use Therein

Organic light emitting diode comprising a non-transparent substrate, an anode, a cathode, an emission layer, an electron injection layer and an electron transport layer stack;

• wherein
• the electron transport layer stack is arranged between the emission layer and the electron injection layer;
• the electron transport layer stack comprises a first electron transport layer and a second electron transport layer;
• the first electron transport layer is in direct contact with the emission layer;
• the first electron transport layer comprises a compound of formula (I)
• wherein
• A is an unsubstituted or substituted C3 to C21 heteroaryl comprising at least one six-membered ring, wherein the six-membered ring comprises at least one N-atom;
• wherein the substituted C3 to C21 heteroaryl is substituted with one or more substituents independently selected from the group consisting of C1 to C7 alkyl, C1 to C7 alkoxy, partially deuterated C1 to C7 alkyl, perdeuterated C1 to C7 alkyl, partially deuterated C1 to C7 alkoxy, perdeuterated C1 to C7 alkoxy, partially fluorinated C1 to C7 alkyl, perfluorinated C1 to C7 alkyl, partially fluorinated C1 to C7 alkoxy, perfluorinated C1 to C7 alkoxy, D, F and CN;
• R is independently selected from the group consisting of substituted or unsubstituted C10 to C18 aryl and a substituted or unsubstituted group of the following formula (2);
• wherein X is independently selected from the group consisting of CR′2, SiR′2, S and O, wherein R′ is independently selected from the group consisting of C1 to C12 alkyl and C6 to C18 aryl;
• wherein the substituted C10 to C18 aryl is substituted with one or more substituents independently selected from the group consisting of C1 to C7 alkyl, C1 to C7 alkoxy, partially deuterated C1 to C7 alkyl, perdeuterated C1 to C7 alkyl, partially deuterated C1 to C7 alkoxy, perdeuterated C1 to C7 alkoxy, partially fluorinated C1 to C7 alkyl, perfluorinated C1 to C7 alkyl, partially fluorinated C1 to C7 alkoxy, perfluorinated C1 to C7 alkoxy, D, F and CN;
• wherein the substituted group of the following formula (2) is substituted with one or more substituents independently selected from the group consisting of C1 to C7 alkyl, C1 to C7 alkoxy, partially deuterated C1 to C7 alkyl, perdeuterated C1 to C7 alkyl, partially deuterated C1 to C7 alkoxy, perdeuterated C1 to C7 alkoxy, partially fluorinated C1 to C7 alkyl, perfluorinated C1 to C7 alkyl, partially fluorinated C1 to C7 alkoxy, perfluorinated C1 to C7 alkoxy, D, F and CN;
• R comprises two 6-membered aryl rings;
• R is bonded to the ring Z by a first C-atom of one of the two 6-membered aryl rings;
• and the first C-atom is adjacent to a second C-atom, wherein the second C-atom is a sp2-C-atom and the second C-atom is not bonded to H;
• X is a single bond or substituted or unsubstituted C6 to C60 aryl;
• wherein the substituted C6 to C60 aryl is substituted with one or more substituents independently selected from the group consisting of C1 to C7 alkyl, C1 to C7 alkoxy, partially deuterated C1 to C7 alkyl, perdeuterated C1 to C7 alkyl, partially deuterated C1 to C7 alkoxy, perdeuterated C1 to C7 alkoxy, partially fluorinated C1 to C7 alkyl, perfluorinated C1 to C7 alkyl, partially fluorinated C1 to C7 alkoxy, perfluorinated C1 to C7 alkoxy, D, F and CN;
• X is bonded to a C-atom of the six-membered ring comprising at least one N-atom of A;
• and
• the second electron transport layer does not comprise a compound according to formula (I).