Delayed fluorescence compound, and organic light emitting diode and display device using the same

An organic light emitting diode, comprising:

• a first electrode;
• a second electrode facing the first electrode;
• and
• an organic emitting layer between the first electrode and the second electrode, the organic emitting layer including a delayed fluorescence compound,
• wherein the delayed fluorescence compound includes an electron acceptor moiety of benzo[4,5]thieno[2,3-b]quinoxaline and an electron donor moiety covalently bonded to a benzene ring of benzo[4,5]thieno[2,3-b]quinoxaline, the electron donor moiety selected from the group consisting of carbazole, phenylcarbazole, acridine, substituted acridine, phenylacridine, and substituted phenylacridine.

A display device, comprising:

• a substrate;
• an organic light emitting diode on the substrate and including a first electrode, a second electrode facing the first electrode, and an organic emitting layer between the first electrode and the second electrode, the organic emitting layer including a delayed fluorescence compound;
• an encapsulation film on the organic light emitting diode;
• and
• a cover window on the encapsulation film,
• wherein the delayed fluorescence compound includes an electron acceptor moiety of benzo[4,5]thieno[2,3-b]quinoxaline and an electron donor moiety covalently bonded to a benzene ring of benzo[4,5]thieno[2,3-b]quinoxaline, the electron donor moiety selected from the group consisting of carbazole, phenylcarbazole, acridine, substituted acridine, phenylacridine, and substituted phenylacridine.