Organic electroluminescent material and device thereof

A metal complex having a general formula of M(La)m(Lb)n(Lc)q,

• wherein
• La, Lb and Lc are a first ligand, a second ligand and a third ligand coordinated to the metal M, respectively, and La, Lb and Lc are the same or different;
• wherein La, Lb and Lc can be optionally joined to form a tetradentate ligand or a multidentate ligand;
• the metal M is selected from a metal with a relative atomic mass greater than 40;
• and
• m is selected from 1 or 2, n is selected from 1 or 2, q is selected from 0 or 1, and m+n+q equals an oxidation state of M;
• when m is 2, two La may be identical or different;
• when n is 2, two Lb may be identical or different;
• wherein La has, at each occurrence identically or differently, a structure represented by Formula 1A;
• and Lb has, at each occurrence identically or differently, a structure represented by Formula 1B:
• wherein
• Z is, at each occurrence identically or differently, selected from the group consisting of O, S, Se, NR′, CR′R′ and SiR′R′;
• when two R′ are present at the same time, the two R′ are identical or different;
• Cy is, at each occurrence identically or differently, selected from a substituted or unsubstituted aromatic ring having 6 to 24 ring atoms, a substituted or unsubstituted heteroaromatic ring having 5 to 24 ring atoms or a combination thereof,
• X1 to X8 are, at each occurrence identically or differently, selected from C, CRx or N, and at least one of X1 to X4 is selected from C and joined to Cy;
• at least one of X1 to X8 is selected from CRx, and the Rx is cyano or fluorine;
• X1, X2, X3 or X4 is joined to the metal M by a metal-carbon bond or a metal-nitrogen bond;
• U1 to U4 are, at each occurrence identically or differently, selected from CRu or N;
• and
• W1 to W3 are, at each occurrence identically or differently, selected from CRw or N;
• wherein in Formula 1A, RA has a structure represented by Formula 2, and the total number of carbon atoms in Formula 2 is greater than or equal to 2:
• wherein “*” represents a position where Formula 2 is joined to Formula 1A;
• RA1, RA2, RA3, R′, Rx, Ru and Rw 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, a 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 RA1, RA2, RA3, R′, Rx, Ru, Rw can be optionally joined to form a ring;
• and
• Lc is a monoanionic bidentate ligand.