Method of preparing luminescent nanocrystals, the nanocrystals obtained and their uses

The present invention includes a method for preparing a nanocrystal having (i) a core comprising a semiconductor comprising A representing a metal or metalloid in the + III oxidation state and B represents an element in the form of -III oxidation, coated with (ii) a shell whose outer part comprises a semiconductor of formula ZnS1-xEx, with E representing an element in the -II oxidation state and x is a decimal number such that 0 < = x <1, said method comprising a step of bringing a mixture of at least one precursor of a, at least one precursor of B, at least one zinc precursor, at least one sulfur precursor and optionally at least one precursor of E, to a temperature T1 to a temperature T2 higher than T1 and increasingly so as to form, first, said core and said shell. The present invention also relates to a nanocrystal obtainable by the method of the invention and its different uses.