Blue photoresist composition, method of preparing the same, color filter, and display device

A method of preparing a blue photoresist composition capable of emitting infrared light comprising:

• grinding and dispersing an infrared light-emitting material into a solvent to give a nano-dispersion comprising infrared light-emitting material nanoparticles having a mean particle diameter of 1 nm to 200 nm;
• modifying the infrared light-emitting material nanoparticles in the nano-dispersion with a polymeric material, followed by removing the solvent, to give polymeric material-modified infrared light-emitting material nanoparticles;
• mixing the polymeric material modified infrared light-emitting material nanoparticles with a colorant to give a color mixed material, and
• mixing the color mixed material with a solvent, an alkali-soluble resin, a an unsaturated monomer, a photoinitiator, and other additives, to give the blue photoresist composition capable of emitting infrared light.