Quantum dot, method for preparing quantum dot, and light emitting element including quantum dot

A method for preparing a quantum dot, the method comprising:

• supplying a first mixture comprising
• a first precursor material comprising a silver precursor, an indium precursor, and a first gallium precursor, and
• a first solvent comprising oleylamine, trioctylphosphine oxide, and trioctylamine;
• adding a first sulfur precursor to the first mixture to form cores, each of the cores comprising silver, indium, gallium, and sulfur;
• reacting the cores with a second precursor material comprising a second sulfur precursor and a second gallium precursor to form a first shell around each of the cores, wherein the cores comprising the first shells comprise first particles;
• and
• adding a first element precursor and a second element precursor to a second mixture, the second mixture comprising the first particles and a second solvent, to form a second shell around each of the first shells,
• wherein the first element precursor and the second element precursor each independently include at least one of a Group II element, a Group III element, a Group V element, a Group VI element, or a VII element.