Light emitting element, ink composition and display device including the light emitting element

An ink composition comprising:

• a nanoparticle core comprising a core compound represented by the following Formula 1;
• a preliminary ligand represented by the following Formula 4;
• and
• a solvent in which the nanoparticle core and the preliminary ligand are dispersed:
• in Formula 1,
• A is Zn, or Sn, and
• “x”, and “y” are each independently an integer of 1 to 5,
• in Formula 4,
• M is one among Li, Na, K, Rb, Cs, Be, Ca, Sr, and Ba,
• R3 and R4 are each independently a hydrogen atom, a deuterium atom, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms, and
• “c” and “d” are each independently an integer of 0 to 3.

A display device comprising:

• a base layer;
• a circuit layer on the base layer;
• and
• a display element layer on the circuit layer and comprising a light emitting element,
• wherein:
• the light emitting element comprises a first electrode, a second electrode on the first electrode, and an electron transport region between the first electrode and the second electrode,
• the electron transport region comprises a nanoparticle comprising a nanoparticle core, and a ligand,
• the nanoparticle core comprises a core compound represented by the following Formula 1, and
• the ligand is bonded to the surface of the nanoparticle core and represented by the following Formula 2 or Formula 3:
• in Formula 1,
• A is Zn, or Sn, and
• “x”, and “y” are each independently an integer of 1 to 5, in Formula 2,
• M is one among Li, Na, K, Rb, Cs, Be, Ca, Sr, and Ba,
• R1 is a hydrogen atom, a deuterium atom, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms,
• “a” is an integer of 0 to 3, and
• “”, and
• are each a position connected with the nanoparticle core, and
• in Formula 3,
• R2 is a hydrogen atom, a deuterium atom, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms,
• M is the same as defined with respect to Formula 2,
• “b” is an integer of 0 to 3, and
• “” is a position connected with the nanoparticle core.