Composition comprising a nanosized light emitting material

1. A composition comprising:

a 1 st organic solvent selected from the group consisting of: alkyl chain compounds having 9-25 carbon atoms; alkenyl chain compounds having 10-25 carbon atoms; glycerin; dimethyl sulfoxide; trimethyl benzenes; docecylbenzene; cyclohexylbenzene; 1,2,3,4-tetramethylbenzene; 1,2,3,5-tetramethylbenzene; 3-isopropylbiphenyl; 3-methylbiphenyl; 4-methylbiphenyl; p-1-methylnaphthalene; and 1,2,3,4-tetrahydronaphthalene;

a 2 nd organic solvent having a boiling point in a range from 150° C. to 330° C. and being different from the 1 st organic solvent;

a matrix material;

and a nanosized light emitting material;

wherein the matrix material comprises a polymer selected from the group consisting of cyclo-olefin copolymers and ethylene vinyl alcohols.

2. The composition according to claim 1 , wherein the composition has an absolute viscosity in the range from 1 mPa·s to 20 mPa·s.

3. The composition according to claim 1 , wherein the composition has a liquid surface tension in a range from 10 mN/m to 60 mN/m.

4. The composition according to claim 1 , wherein the polymer has a molecular weight in a range from 10,000-150,000.

5. The composition according to claim 1 , wherein the polymer is a cyclo-olefin copolymer.

6. The composition according to claim 1 , wherein the 1 st organic solvent is an alkyl chain compound with an alkyl chain having 10 to 25 carbon atoms or an alkenyl chain compound with an alkenyl chain having 11 to 25 carbon atoms.

7. The composition according to claim 1 , wherein the 2 nd organic solvent is selected from the group consisting of hydrocarbons having 5-25 carbon atoms, glycols, acetamides, and dimethyl sulfoxide.

8. Method for preparing of the composition according to claim 1 , wherein the method comprises following step (a),

(a) mixing the 1 st organic solvent, the 2 nd organic solvent, the matrix material, and the nanosized light emitting material.

9. Method for preparing of a light emitting medium, wherein the method comprises at least following steps (A) and (B) in this sequence,

(A) providing the composition according to claim 1 , onto a substrate,

(B) removing the 1 st organic solvent from the composition.

10. The composition according to claim 1 , wherein the polymer is a transparent polymer.

11. The method of claim 9 , wherein the substrate is a transparent substrate including an array of pixels which are filled with the matrix material and the nanosized light emitting material by the method.

12. The method of claim 11 , further comprising preparing a light emitting device from the light emitting medium prepared by the method.