CPC G02B 5/208 (2013.01) [C08K 3/08 (2013.01); C08K 5/235 (2013.01); C08K 5/3417 (2013.01); C08K 5/52 (2013.01); C09B 23/08 (2013.01); C09B 53/02 (2013.01); C09B 57/00 (2013.01); C09B 57/007 (2013.01); G02B 1/04 (2013.01); G02B 1/11 (2013.01); G02B 5/223 (2013.01); C08K 2003/085 (2013.01); H10K 30/80 (2023.02); H10K 39/32 (2023.02)] | 27 Claims |
1. An optical filter, comprising
a polymer film having a* of about −5.0 to about +5.0 and b* of about −5.0 to about +5.0, based on a color coordinate expressed by a CIE Lab color space; and
a near infrared absorption layer on the polymer film, the near infrared absorption layer being configured to transmit light in a visible region and to selectively absorb at least one part of light in a near infrared region,
the near infrared absorption layer including a first near infrared absorption material and a second near infrared absorption material,
the first near infrared absorption material including a copper phosphate ester compound represented by Chemical Formula 4:
wherein, in Chemical Formula 4,
R41 and R42 are independently one of a substituted or unsubstituted C1 to C20 alkyl group, a substituted or unsubstituted C2 to C20 alkenyl group, a substituted or unsubstituted C2 to C20 alkynyl group, or a substituted or unsubstituted C6 to C20 aryl group,
n1 is an integer of 0 or 1, and
n2 is an integer of 1 or 2,
the second near infrared absorption material including at least two different organic dyes, and
the second near infrared absorption material having a maximum absorption wavelength (λmax) in a wavelength region of about 650 nm to about 1200 nm.
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