Wavelength conversion layer

A wavelength conversion layer containing semiconductor nanoparticles, wherein

• each of the semiconductor nanoparticles contained in the wavelength conversion layer has a core and a shell having one or more layers;
• the wavelength conversion layer can convert light having a wavelength of 450 nm to light having a peak wavelength of 500 nm to 550 nm, or light having a peak wavelength of 600 nm to 660 nm;
• the core contains In and P;
• at least one layer of the shell is ZnXTe (wherein X represents Se or S, or both Se and S);
• and
• amounts of X and Te contained in the shell satisfy Te/(X+Te)=0.01 to 0.60 (wherein X is Se).

A wavelength conversion layer containing semiconductor nanoparticles, wherein

• each of the semiconductor nanoparticles contained in the wavelength conversion layer has a core and a shell having one or more layers;
• the wavelength conversion layer can convert light having a wavelength of 450 nm to light having a peak wavelength of 500 nm to 550 nm, or light having a peak wavelength of 600 nm to 660 nm;
• the core contains In and P;
• at least one layer of the shell is ZnXTe (wherein X represents Se or S, or both Se and S);
• and
• amounts of X and Te contained in the shell satisfy Te/(X+Te)=0.01 to 0.60, wherein X is S.