Method for manufacturing light-emitting material

A method for manufacturing a light-emitting material, comprising the steps of:

• putting a mixture of a material including sulfur, a material including copper and a material including aluminum in a first reaction container;
• hermetically sealing the first reaction container in a state where a reduced pressure is held in the first reaction container;
• baking the mixture of the material including sulfur, the material including copper and the material including aluminum in the hermetically-sealed first reaction container to obtain CuAlS2;
• preparing a mixture of zinc sulfide and CuAlS2;
• putting the mixture of zinc sulfide and CuAlS2 in a second reaction container;
• hermetically sealing the second reaction container in a state where a reduced pressure is held in the second reaction container;
• and
• baking the mixture of zinc sulfide and CuAlS2 in the hermetically-sealed second reaction container.

A method for manufacturing a light-emitting material, comprising the steps of:

• putting a mixture of copper sulfide and aluminum sulfide in a first reaction container;
• hermetically sealing the first reaction container in a state where a reduced pressure is held in the first reaction container;
• baking the mixture of copper sulfide and aluminum sulfide in the hermetically-sealed first reaction container to obtain CuAlS2;
• preparing a mixture of zinc sulfide and CuAlS2;
• putting the mixture of zinc sulfide and CuAlS2 in a second reaction container;
• hermetically sealing the second reaction container in a state where a reduced pressure is held in the second reaction container;
• and
• baking the mixture of zinc sulfide and CuAlS2 in the hermetically-sealed second reaction container.