Photon up-conversion film and method of producing the film

A method of producing a photon up-conversion film, comprising:

• preparing an oil-in-water emulsion from an aqueous solution of a water-soluble resin, and an oily solvent solution of a sensitizing component and a light-emitting component, or an oily solvent dispersion thereof;
• applying the oil-in-water emulsion to a substrate to form a coating film;
• drying the coating film;
• and
• applying an external force and/or heat to the dried coating film to form a film, which includes a matrix including the water-soluble resin and a pore portion, and in which the sensitizing component and the light-emitting component are present at an interface between the matrix and the pore portion.

A method of producing a photon up-conversion film, comprising:

• preparing a water-in-oil emulsion from an oily solvent solution of an oil-soluble resin, and an aqueous solution of a sensitizing component and a light-emitting component, or an aqueous dispersion thereof;
• applying the water-in-oil emulsion to a substrate to form a coating film;
• drying the coating film;
• and
• forming, through the drying, a film, which includes a matrix including the oil-soluble resin and a pore portion, and in which the sensitizing component and the light-emitting component are present at an interface between the matrix and the pore portion.