Quantum dot and light emitting diode including the same

A light-emitting device comprising:

• a first electrode;
• a second electrode facing the first electrode;
• an emission layer provided between the first electrode and the second electrode,
• wherein the emission layer includes a core including at least one first positive ion precursor and at least one negative ion precursor, a shell including at least one second positive ion precursor and at least one negative ion precursor and wrapping the core, and a ligand formed on a surface of the shell, and wherein the first positive ion precursor is an n-period element and the second positive ion precursor is an (n-1)-period element, where n is an integer of 3 to 6;
• a hole transport layer disposed between the first electrode and the emission layer;
• and
• an electron transport layer disposed between the emission layer and the second electrode,
• wherein the hole transport layer, the electron transport layer and the core of the emission layer include a same inorganic material,
• wherein the hole transport layer includes a p-doped compound of the compound included in the core, the p-doped compound being doped with a metal, a non-metal, or a halogen element, and
• the electron transport layer includes an n-doped compound of the compound included in the core, the n-doped compound being doped with a metal, a non-metal, or a halogen element.