Organic light emitting element

An organic light emitting element, comprising:

• a first electrode;
• a second electrode;
• and
• an organic material layer positioned between the first electrode and the second electrode, wherein
• the organic material layer includes a compound represented by chemical formula 1 below:
• in chemical formula 1,
• either X or Y is N, and the other is S or O, wherein
• R1 and R2 are each independently selected from the group consisting of a C6-C60 aryl group;
• a fluorenyl group;
• and a C2-C60 heterocyclic group including at least one heteroatom of O, N, S, Si, and P,
• b is an integer from 0 to 3,
• R3 is each independently a C1-C20 alkyl group;
• or C6-C60 aryl group,
• a is an integer from 0 to 2,
• L1 is each independently selected from the group consisting of a single bond;
• a fluorenylene group;
• and a C6-C60 arylene group,
• Ar is selected from the group consisting of hydrogen;
• halogen;
• a cyano group;
• a C1-C20 alkyl group;
• a fluorenyl group;
• a C6-C60 aryl group;
• and a C2-C60 heterocyclic group including at least one heteroatom of O, N, S, Si and P, and
• the aryl group, the heterocyclic group, the arylene group, and the alkyl group each are further substituted with one or more substituents selected from the group consisting of a halogen group;
• a C1-C20 alkyl group;
• a C2-C20 alkenyl group;
• a C2-C20 alkynyl group;
• a fluorenyl group;
• a C6-C20 aryl group;
• and a C2-C20 heterocyclic group.