Optical filter, light absorbing composition, method for producing optical filter, sensing device and sensing method

An optical filter comprising:

• a light-absorbing compound;
• and
• a resin,
• wherein the optical filter has a first transmission spectrum at an incident angle of 0° at 25° C. before a heating test in which the optical filter is heated at 125° C. for 200 hours, the first transmission spectrum satisfying the following requirements (i), (ii), (iii), and (iv),
• wherein the optical filter has a second transmission spectrum at an incident angle of 0° at 25° C. after the heating test, and
• wherein an absolute value of a difference between a wavelength λ1-UV25° C. which lies in a wavelength range of 350 nm to 450 nm and at which a transmittance is 50% in the first transmission spectrum and a wavelength λ2-UV25° C. which lies in the wavelength range of 350 nm to 450 nm and at which the transmittance is 50% in the second transmission spectrum is 8 nm or less:
• (i) an average transmittance in a wavelength range of 300 nm to 380 nm is 1% or less;
• (ii) an average transmittance in a wavelength range of 450 nm to 600 nm is 80% or more;
• (iii) an average transmittance in a wavelength range of 700 nm to 725 nm is 10% or less;
• and
• (iv) an average transmittance in a wavelength range of 950 nm to 1150 nm is 5% or less.