Semiconductor nanoparticle, production method thereof, electroluminescent device and display device including the same

A method for making a semiconductor nanoparticle, wherein the semiconductor nanoparticle includes zinc, sulfur, and selenium,

• the semiconductor nanoparticle comprises a first semiconductor nanocrystal, and a semiconductor nanocrystal shell including zinc and sulfur, the semiconductor nanocrystal shell disposed on the first semiconductor nanocrystal,
• the semiconductor nanoparticle does not comprise cadmium,
• the semiconductor nanoparticle includes a plurality of organic ligands, and the plurality of organic ligands comprise:
• a first organic ligand having a carbon number of less than or equal to 13;
• and
• a second organic ligand having a carbon number of greater than or equal to 15, the second organic ligand comprises two or more carbon-carbon double bonds and is different than the first organic ligand,
• wherein the method comprises:
• contacting a zinc precursor and a sulfur precursor in a reaction medium including an organic solvent and optionally an organic ligand, in the presence of a particle including a first semiconductor nanocrystal and optionally a second semiconductor nanocrystal;
• and
• adding a metal halide to the reaction medium,
• wherein the zinc precursor comprises a first zinc precursor including the first organic ligand and a zinc ion and a second zinc precursor including the second organic ligand and a zinc ion.

An electroluminescent device comprising a first electrode and a second electrode that are spaced apart, and an emission layer disposed between the first electrode and the second electrode, wherein the emission layer comprises a semiconductor nanoparticle,

• wherein the semiconductor nanoparticle includes zinc, sulfur, and selenium,
• the semiconductor nanoparticle comprises a first semiconductor nanocrystal, and a semiconductor nanocrystal shell including zinc and sulfur, the semiconductor nanocrystal shell disposed on the first semiconductor nanocrystal,
• the semiconductor nanoparticle does not comprise cadmium,
• the semiconductor nanoparticle includes a plurality of organic ligands, and the plurality of organic ligands comprise:
• a first organic ligand having a carbon number of less than or equal to 13;
• and
• a second organic ligand having a carbon number of greater than or equal to 15, wherein second organic ligand comprises two or more carbon-carbon double bonds and is different than the first organic ligand.