Organic electroluminescent material and device

A metal complex, which has a structure represented by Formula 1-15:

• wherein,
• E3 is, at each occurrence identically or differently, selected from C or N;
• R1 and R2 represent, at each occurrence identically or differently, mono-substitution, multiple substitutions, or non-substitution;
• X is selected from the group consisting of:
• O, S, Se, NR″, CR″R″, SiR″R″ and GeR″R″;
• when two R″ exist at the same time, the two R″ are the same or different;
• X2, X4 to X8 are, at each occurrence identically or differently, selected from C, CRx or N;
• X11 is selected from O, S, Se or NR1;
• X31 to X34 are, at each occurrence identically or differently, selected from CR3 or N;
• at least one of X5 to X8 is selected from CRx and the Rx is a cyano group;
• R1, R2, R3, R″ and Rx are, at each occurrence identically or differently, selected from the group consisting of:
• hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclic group having 3 to 20 ring atoms, substituted or unsubstituted arylalkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted alkynyl having 2 to 20 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, substituted or unsubstituted alkylgermanyl having 3 to 20 carbon atoms, substituted or unsubstituted arylgermanyl having 6 to 20 carbon atoms, substituted or unsubstituted amino having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a sulfanyl group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof;
• adjacent substituents R1, R2, R3, R″ and Rx can be optionally joined to form a ring.