Patent ID: 11939502
Assignee: QUSTOMDOT B.V.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  F  B | IPC B  C  F

Claim 9:
10. A process for producing a quantum dot comprising the steps of:
(a) producing a core nanocrystal of a binary, ternary or quaternary III-V material consisting in:
at least one element selected from the group consisting of In, Ga and Al, and
at least one element selected from the group consisting of P and As;

(b) forming a first layer on the core nanocrystal, the first layer being of a binary or ternary II-VI material consisting in:
Zn, and
at least one element selected from the group consisting of S and Se;

(c) forming an external shell on the first layer, the external shell being of a ternary or quaternary II-VI material consisting in:
Zn
Cd, and
at least one element selected from the group consisting of S and Se; and

wherein the external shell is made of an alloy of Zn, Cd and Se and step (c) comprises adding a compound including Cd, a compound including Zn and a compound including Se to a solution produced at step (b); and
wherein step (c) comprises, in this order:
adding a compound including Cd and a compound including Zn to a solution produced at step (b), and
adding a compound including Se, and
wherein the atomic ratio between the added Cd and the added Cd plus the added Zn is between 0.02 and 0.2.