Color conversion film, method for producing same, back-light unit and display apparatus

A color conversion film comprising:

• a resin matrix;
• and
• an organic fluorescent substance dispersed in the resin matrix, and absorbing blue or green light and emitting light having a wavelength different from the absorbing light,
• wherein the organic fluorescent substance has the following Chemical Formula 1:
• wherein in Chemical Formula 1,
• X1 and X2 are a fluorine group or an alkoxy group,
• R1 to R4 are the same as or different from each other, and each independently hydrogen, a halogen group, an alkyl group, an alkoxy group, a carboxyl group-substituted alkyl group, —COOR or a —COOR-substituted alkyl group, and herein, R is an alkyl group,
• R5 and R6 are the same as or different from each other, and are each independently a cyano group, a nitro group, an alkyl group, a carboxyl group-substituted alkyl group, or —SO3Na, R1 and R5 may be linked to each other to form a substituted or unsubstituted hydrocarbon ring or a substituted or unsubstituted heteroring, and R4 and R6 may be linked to each other to form a substituted or unsubstituted hydrocarbon ring or a substituted or unsubstituted heteroring, and
• R7 is an alkyl group;
• or a haloalkyl group,
• wherein the resin matrix includes a thermoplastic resin comprising one or more selected from the group consisting of a polymethyl methacrylate (PMMA) resin a styrene-acrylonitrile (SAN)-based resin, and a polyvinyl alcohol (PVA)-based resin and
• wherein the color conversion film has a light emission peak with a full width at half maximum (FWHM) of 60 nm or less, quantum efficiency of 80% or greater and an absorption coefficient of 30,000 M−1cm−1 or greater at a maximum absorption wavelength when irradiating light having a light emission peak at 450 nm, a FWHM of 40 nm or less and monomodal light emission intensity distribution.