Organic electroluminescent material and device

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

• wherein,
• the metal M is, at each occurrence identically or differently, selected from a metal with a relative atomic mass greater than 40;
• ring A1 to ring A3 are, at each occurrence identically or differently, selected from an aromatic ring having 6 to 30 carbon atoms, a heteroaromatic ring having 5 to 30 ring atoms or combinations thereof;
• L1 to L4 are, at each occurrence identically or differently, selected from single bond, BR′, CR′R′, NR′, O, SiR′R′, PR′, S, GeR′R′, Se, substituted or unsubstituted vinylidene, ethynylene, substituted or unsubstituted arylene having 6 to 30 carbon atoms, substituted or unsubstituted heteroarylene having 3 to 30 carbon atoms, and combinations thereof;
• when two R′ exist at the same time, the two R′ are the same or different;
• a1 to a4 are, at each occurrence identically or differently, selected from 0 or 1;
• and at least two of a1 to a4 are selected from 1;
• E1 to E4 are, at each occurrence identically or differently, selected from C or N;
• G1 to G4 are, at each occurrence identically or differently, selected from single bond, O or S;
• R1 to R3 represent, at each occurrence identically or differently, mono-substitution or multiple substitutions, non-substitution;
• ring A4 has a structure represented by Formula 2:
• 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;
• X1 to X8 are, at each occurrence identically or differently, selected from C, CRx or N;
• at least one of X1 to X4 is selected from C and connected with L3 or L4;
• at least one of X1 to X8 is selected from CRx and the Rx is a cyano group or fluorine;
• R1, R2, R3, R′, 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;
• wherein, “*” represents the position where the ring A4 is connected to the ring A1 through L4, “” represents the position where the ring A4 is connected to the metal M through G4, and “#” represents the position where the ring A4 is connected to the ring A3 through L3;
• adjacent substituents R1, R2, R3, R′, R″ and Rx can be optionally joined to form a ring.