Organic electroluminescent device and display apparatus thereof

An organic electroluminescent device, comprising:

• an anode,
• a cathode, and
• an emissive layer disposed between the anode and the cathode, wherein the emissive layer comprises at least a phosphorescence sensitizer and a fluorescent material;
• the fluorescent material comprises at least one B atom;
• the phosphorescence sensitizer is a metal complex, and the metal is Ir;
• the phosphorescence sensitizer comprises a structure represented by a fragment of Formula 1;
• wherein “#” represents a position where the metal Ir is joined, and “*” represents a position where another fragment in the metal complex is joined;
• Y1 and Y2 are each independently selected from C or N;
• Y3 to Y5 are each independently selected from CRy, N, NRy1, O or Se;
• Ry and Ry1 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 Ry and Ry1 can be optionally joined to form a ring;
• and
• the phosphorescence sensitizer comprises at most two fragments of Formula 1.