Nanocrystal particles and processes for synthesizing the same

A nanocrystal particle comprising at least one semiconductor material and at least one halogen element,

• wherein the nanocrystal particle has a core-shell structure including a core comprising a first semiconductor nanocrystal;
• and
• a shell surrounding the core and comprising a crystalline or amorphous semiconductor material, and
• wherein the at least one halogen element is present as being doped therein or as a metal halide,
• wherein the at least one halogen element comprises fluorine,
• wherein the fluorine is included in an interface between the core and the shell, in the shell, or in the interface between the core and the shell and in the shell,
• wherein the first semiconductor nanocrystal of the core or the crystalline semiconductor material of the shell comprises a Group II-VI compound, a Group III-V compound, or a combination thereof,
• wherein the nanocrystal particle has a quantum yield of greater than or equal to about 50%,
• wherein the crystalline or amorphous semiconductor material of the shell comprises a composition different from that of the first semiconductor nanocrystal of the core, and
• wherein the nanocrystal particle does not include cadmium.