Quantum dot-ligand composite, photosensitive resin composition, optical film, electroluminescent diode, and electronic device

A quantum dot-ligand composite, which comprises quantum dots comprising a semiconductor nanocrystalline core that comprises Group III and V elements and a semiconductor nanocrystalline shell that is disposed on the semiconductor nanocrystalline core and comprises Group II and VI elements;

• and organic ligands coordinated to the quantum dots;
• wherein the quantum dots show a maximum photoluminescence peak in a wavelength region between 500 nm and 650 nm;
• and
• the effective binding ratio (EBR) of the quantum dots and the organic ligands defined by the following [Equation 1] is 0.1 to 0.6:
• EBR
• =
• C
• l
• i
• g
• a
• n
• d
• C
• Q
• D
• =
• m
• l
• i
• g
• a
• n
• d
• M
• l
• i
• g
• a
• n
• d
• ×
• c
• l
• i
• g
• a
• n
• d
• m
• Q
• D
• M
• Q
• D
• ×
• c
• n
• e
• t
• wherein:
• CQD is the total amount of the positive charge of the quantum dot nanocrystals determined by the inorganic elements constituting the quantum dots;
• Cligand is the total amount of the negative charge of the organic ligands bound to the quantum dot surface to electrically stabilize the quantum dots;
• mligand is the mass ratio of the organic ligands to the total amount of the quantum dots and the organic ligands;
• mQD is the mass ratio of the inorganic semiconductor nanoparticles constituting the quantum dots to the total amount of the quantum dots and the organic ligands;
• MQD is the average molar mass of the quantum dots determined by the inorganic elements constituting the quantum dots;
• Mligand is the molecular weight of the organic ligands coordinated to the quantum dots;
• cnet is the net charge per mole of the quantum dots determined by the inorganic elements constituting the quantum dots;
• and
• cligand is the amount of charge possessed by the organic ligands in a coordinated state.