Method for producing a quantum dot nanoparticles, quantum dot nanoparticles prepared by the method, quantum dot nanoparticles having a core-shell structure, and light emitting element

A quantum dot nanoparticle, wherein the quantum dot nanoparticle has 0.70 or less of the Peak-to-Valley (P) value by following Equation 1, wherein the Peak-to-Valley (P) value is calculated by the UV absorption wavelength,

• Peak-to-Valley(P)=A/B [Equation 1]
• Wherein A is the minimum absorbed amount of the valley portion in the UV absorption wavelength of the quantum dot nanoparticle and B is the maximum absorbed amount of the peak portion in the UV absorption wavelength of the quantum dot nanoparticle,
• wherein the quantum dot nanoparticle is prepared by a method comprising the step of reacting one or more cation precursors including one or more of Groups 12 and 13 elements with one or more anion precursors including one or more of Group elements,
• wherein the reaction of the cation precursors and the anion precursors is carried out under the supply of a mixture including a compound represented by following Chemical Formula 1 and a volatile polar solvent having a lower boiling point than the compound represented by Chemical Formula 1:
• X2O [Chemical Formula 1]
• Wherein X is hydrogen or deuterium.