Quantum dot, electronic device, and method of preparing quantum dot

A method for preparing a quantum dot, comprising

• preparing a precursor solution of a Group IIIA element comprising a precursor of a Group IIIA element, a first amine compound, and optionally a phosphine compound;
• preparing a precursor solution of a Group VA element comprising a precursor of a Group VA element and a second amine compound;
• while heating the precursor solution of the Group IIIA element, mixing the precursor solution of the Group VA element with the precursor solution of the Group IIIA element to react the precursor of the Group IIIA element and the precursor of the Group VA element;
• after the reacting, obtaining a quantum dot comprising the Group IIIA element and the Group VA element, and comprising the first amine compound, the second amine compound, the optional phosphine compound, or a combination thereof on a surface of the quantum dot;
• and
• replacing the first amine compound, the second amine compound, the phosphine compound, or the combination thereof on the surface of the obtained quantum dot with an aliphatic hydrocarbon compound substituted with a hydroxy group and a thiol group,
• wherein the quantum dot comprises the Group IIIA element and the Group VA element, and has an absorption peak wavelength of greater than or equal to about 1,000 nanometers in a visible-infrared absorption spectrum.