Semiconductor nanoparticle, method for manufacturing same, and light emitting device

A semiconductor nanoparticle comprising:

• silver (Ag);
• lithium;
• at least one of indium (In) and gallium (Ga);
• and sulfur (S), wherein
• a total content of silver (Ag) and lithium is 10 mol % to 30 mol %, a total content of indium (In) and gallium (Ga) is 15 mol % to 35 mol %, and a content of sulfur (S) is 35 mol % to 55 mol %, wherein
• the semiconductor nanoparticle irradiated with light having a wavelength in a range of 200 nm or more and less than 500 nm emits light having an emission peak wavelength in a range of 500 nm to 650 nm and a half-value width of 250 meV or less in an emission spectrum.