Purification method of nanoparticle, nanoparticle composition, and manufacturing method of nanoparticle composition

A method for manufacturing a nanoparticle composition, comprising:

• a step of preparing a nanoparticle that has a perovskite-type crystal structure as an allotrope and includes multiple crystal structures;
• a step of preparing a ligand solution containing a solvent that has a relative dielectric constant of a prescribed value or less and an associative ligand that includes a main chain having a plurality of carbon atoms and a polar group having a higher polarity than the main chain and self-associates in the solvent;
• and
• a step of preparing a nanoparticle dispersion by bringing the nanoparticle and the ligand solution into contact with each other, wherein
• the step of preparing the nanoparticle dispersion includes a step of selectively increasing a ratio of the content of a prescribed crystal structure in the multiple crystal structures.

A nanoparticle composition comprising:

• a nanoparticle having a perovskite-type crystal structure as an allotrope;
• and
• an associative ligand including a main chain having a plurality of carbon atoms and a polar group having a higher polarity than the main chain, wherein
• at least a portion of the associative ligand coordinates to the nanoparticle via the polar group to change the crystal structure of the nanoparticle.

A nanoparticle composition comprising:

• a solvent having a relative dielectric constant of a prescribed value or less;
• a nanoparticle having a perovskite-type crystal structure as an allotrope;
• multiple ligands each including a main chain having a plurality of carbon atoms and a polar group having a higher polarity than the main chain, wherein the multiple ligands include:
• a first component that constitutes a reverse micelle-like structure in the solvent;
• and
• a second component that coordinates to the surface of the nanoparticle.