Method for preparing quantum dot, quantum dot, and display device

A method for preparing a quantum dot, comprising:

• providing a first precursor solution, a second precursor solution, a first selenium precursor solution, and a second selenium precursor solution with a lower reaction activity than the first selenium precursor solution;
• adding the first selenium precursor solution to the second precursor solution to form an intermediate of the quantum dot;
• and
• performing the following operation at least once to form the quantum dot:
• adding the first precursor solution and the second selenium precursor solution to the intermediate of the quantum dot and making them react,
• wherein the first precursor solution is selected from one of a first zinc precursor solution, a first cadmium precursor solution, or a first lead precursor solution, and the second precursor solution is selected from one of a second zinc precursor solution, a second cadmium precursor solution, or a second lead precursor solution.