Optical film, composition for forming coating layer, and electronic device

An optical film, comprising:

• a substrate;
• and a coating layer formed on the substrate,
• wherein the coating layer comprises a vinyl cyan compound-aromatic compound copolymer and a dye having a maximum absorption wavelength of 750 nm or more and 1500 nm or less,
• wherein the optical film has an initial average transmittance (T0) of at least 30% in the wavelength range of 800 nm to 1000 nm, and
• wherein an average transmittance change rate 1 calculated by the following Mathematical Formula 1 is 18% or less:
• Average transmittance change rate 1=[(Average transmittance(T1)possessed by the optical film in a wavelength range of 800 nm to 1000 nm after exposure to a wavelength range of 300 nm to 400 nm for 15 to 30 hours−the Initial average transmittance (T0)possessed by the optical film in a wavelength range of 800 nm to 1000 nm)/T0]*100. [Mathematical Formula 1]