Nanoparticle and composition, light-emitting diode and display device comprising same

The invention discloses a nanoparticle which comprises a quantum dot and a diphenylphosphine ligand connected to the surface of the quantum dot, Se is arranged on the surface of the quantum dot, the diphenylphosphine ligand and the Se are connected through a coordination bond, and in the nanoparticle, the mass ratio of the diphenylphosphine ligand to the quantum dot ranges from 0.08: 1 to 0.2: 1. Strong chemical bonding can be formed between the diphenylphosphine ligand in the nanoparticle and Se on the surface of the quantum dot to cover Se, so that non-radiative relaxation caused by exposed Se is avoided, the light stability of the nanoparticle is effectively improved, the efficiency of a light-emitting diode comprising the nanoparticle is effectively improved, and the service life of the light-emitting diode is effectively prolonged. In addition, the invention also discloses a composition comprising the nanoparticles, a light-emitting diode comprising the nanoparticles and a display device comprising the l