Composition for color converting member and production method of color conversion substrate using the same

1. A color conversion member composition comprising (A) a color filter material, (B) a photoluminescent inorganic nanocrystal, (C) a medium, and (D) a solvent, the color filter material (A) and the photoluminescent inorganic nanocrystal (B) differing in affinity to the medium (C) and/or the solvent (D).

2. The color conversion member composition according to claim 1 , which contains the color filter material (A) in an amount of 1 to 10 wt %, the photoluminescent inorganic nanocrystal (B) in an amount of 1 to 10 wt %, the medium (C) in an amount of 10 to 50 wt %, and the solvent (D) in an amount of 30 to 80 wt %.

3. The color conversion member composition according to claim 1 , wherein the photoluminescent inorganic nanocrystal (B) is surface-modificated with an organic compound having a coordinating functional group.

4. The color conversion member composition according to claim 3 , wherein the coordinating functional group is at least one group selected from an amino group, a thiol group, a phosphoric ester group, a phosphonic acid group, a carboxyl group, a vinyl group, a phosphine group, a phosphine oxide group, and an epoxy group.

5. The color conversion member composition according to claim 1 , wherein the medium (C) comprises a compound having a polymerizable group.

6. The color conversion member composition according to claim 5 , wherein the medium (C) further comprises a polymerization initiator.

7. The color conversion member composition according to claim 1 , wherein the emission spectrum of the photoluminescent inorganic nanocrystal (B) overlaps the transmission spectrum of the color filter material (A) in an amount of 50% or more in area.

8. The color conversion member composition according to claim 1 , having a viscosity of 1 to 500 mPa·s.

9. A method of producing a color conversion substrate comprising:

applying the composition according to claim 1 to a substrate to form a film; and

causing the color filter material (A) and the photoluminescent inorganic nanocrystal (B) to undergo phase separation in the film to form a color filter layer and a color conversion layer.

10. The method of producing a color conversion substrate according to claim 9 , wherein a patterned film is formed using a photolithographic method or a printing method.

11. The method of producing a color conversion substrate according to claim 10 , wherein the printing method is a screen printing method, an inkjet method, or a nozzle jet method.

12. A color conversion member composition comprising (A) a color filter material, (B) a photoluminescent inorganic nanocrystal, (C) a medium, and (D) two or more solvents, all of the solvents (D) being good solvents for one of the color filter material (A) and the photoluminescent inorganic nanocrystal (B), the solvents (D) including a good solvent and a poor solvent for the other of the color filter material (A) and the photoluminescent inorganic nanocrystal (B), and the good solvent having a vapor pressure higher than that of the poor solvent.

13. The color conversion member composition according to claim 12 , wherein the relative volatility of the good solvent with respect to the poor solvent is 10 to 1000.

14. The color conversion member composition according to claim 12 , which contains the color filter material (A) in an amount of 1 to 10 wt %, the photoluminescent inorganic nanocrystal (B) in an amount of 1 to 10 wt %, the medium (C) in an amount of 10 to 50 wt %, and the solvent (D) in an amount of 30 to 80 wt %.

15. The color conversion member composition according to claim 12 , having a viscosity of 1 to 500 mPa·s.

16. A method of producing a color conversion substrate comprising:

applying the composition according to claim 12 to a substrate to form a film; and

causing the color filter material (A) and the photoluminescent inorganic nanocrystal (B) to undergo phase separation in the film to form a color filter layer and a color conversion layer.

17. A method of producing a color conversion substrate comprising:

applying the color conversion member composition according to claim 12 to a substrate to form a film;

evaporating the good solvent from the film to cause one of the color filter material (A) and the photoluminescent inorganic nanocrystal (B) to be deposited on the top surface of the film to form one of a color filter layer and a color conversion layer; and

evaporating the poor solvent to form the other of the color filter layer and the color conversion layer.

18. The method of producing a color conversion substrate according to claim 17 , wherein, after evaporating the good solvent, the poor solvent is evaporated by increasing the temperature.

19. The method of producing a color conversion substrate according to claim 17 , comprising curing the composition after evaporating the solvents.