Patent ID: 8313969

Claim:
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 representing an element in the −III oxidation state, coated with (ii) a shell in which the outer portion comprises a semiconductor having the formula ZnS 1-x E x , where E represents an element in the −II oxidation state and x is a decimal number such that 0 ≦x<1, the method comprising: heating a mixture of at least one precursor of A, at least one precursor of B, at least one precursor of zinc, at least one precursor of sulphur and, optionally, at least one precursor of E, from a temperature T 1 to a temperature T 2 greater than T 1 in an increasing manner and so as to form, firstly, said core then said shell.