Near-infrared absorbing film, optical filter comprising the same and electronic device

Patent metadata

Field	Value
Publication number	US-11073643-B2
Application number	US-201916268662-A
Country	US
Kind code	B2
Filing date	Feb 6, 2019
Priority date	Mar 27, 2018
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

Disclosed are a near-infrared absorbing film including a polymer film, a first near-infrared absorbing layer and a second near-infrared absorbing layer on the polymer film. The first near-infrared absorbing layer may be configured to transmit light in a visible region and to selectively absorb at least one part of light in a near-infrared region. The second near-infrared absorbing layer may be disposed on a surface of the first near-infrared absorbing layer. The first near-infrared absorbing layer may include a dye represented by Chemical Formula 1. The second near-infrared absorbing layer may include a copper complex compound. An optical filter may include the near-infrared absorbing film. An electronic device may include the optical filter.In Chemical Formula 1, R1 to R12 are described in the detailed description.

First claim

What is claimed is:

1. A near-infrared absorbing film, comprising
a polymer film,
a first near-infrared absorbing layer on the polymer film, the first near-infrared absorbing layer configured to transmit light in a visible region and to selectively absorbing at least one part of light in a near-infrared region, and
a second near-infrared absorbing layer on a surface of the first near-infrared absorbing layer,
the first near-infrared absorbing layer including a dye represented by Chemical Formula 1, and
the second near-infrared absorbing layer including a copper complex compound,

wherein, in Chemical Formula 1,
R 1 , R 2 , and R 5 to R 12 are independently one of a hydrogen atom, a substituted or unsubstituted C1 to C20 alkyl group, or a substituted or unsubstituted C6 to C20 aryl group, and
R 3 and R 4 independently include one of a substituted or unsubstituted C6 to C20 aryl group.

2. The near-infrared absorbing film of claim 1 , wherein R 3 and R 4 are independently a C6 to C20 aryl group substituted or unsubstituted with a C1 to C10 alkyl group.

3. The near-infrared absorbing film of claim 1 , wherein the dye represented by Chemical Formula 1 has a maximum absorption wavelength (λ max ) in a wavelength region of about 715 nm to about 725 nm.

4. The near-infrared absorbing film of claim 1 , wherein the copper complex compound includes a copper phosphate salt.

5. The near-infrared absorbing film of claim 4 , wherein the copper phosphate salt includes a structure represented by one of Chemical Formula 2-1 to Chemical Formula 2-3:

wherein, in Chemical Formula 2-1 to Chemical Formula 2-3,
R a to R h are independently one of a hydrogen atom or a substituted or unsubstituted C1 to C20 alkyl group.

6. The near-infrared absorbing film of claim 1 , wherein the near-infrared absorbing film has an average light transmittance of about 50% in a wavelength region of about 630 nm to about 640 nm.

7. The near-infrared absorbing film of claim 1 , wherein the first near-infrared absorbing layer further includes an organic binder.

8. The near-infrared absorbing film of claim 7 , wherein the organic binder includes one of a thermally curable binder, a photo-curable binder, or a combination thereof.

9. The near-infrared absorbing film of claim 8 , wherein the first near-infrared absorbing layer further includes one of a cyanine-based dye, a phthalocyanine-based dye, a dithiolene metal complex dye, a diimmonium-based dye, or a combination thereof.

10. The near-infrared absorbing film of claim 1 , wherein the polymer film includes one of polyethyleneterephthalate, polyethylenenaphthalate, triacetyl cellulose, polycarbonate, cycloolefin polymer, poly(meth)acrylate, polyimide, or a combination thereof.

11. The near-infrared absorbing film of claim 1 , wherein the polymer film is configured to selectively absorb at least one part of light in an ultraviolet (UV) region.

12. The near-infrared absorbing film of claim 1 , wherein the first near-infrared absorbing layer is between the polymer film and the second near-infrared absorbing layer.

13. The near-infrared absorbing film of claim 1 , wherein the second near-infrared absorbing layer is between the polymer film and the first near-infrared absorbing layer.

14. The near-infrared absorbing film of claim 13 , wherein the near-infrared absorbing film has an average light transmittance of less than or equal to about 2.5% in a wavelength region of about 700 nm to about 740 nm.

15. An optical filter comprising
the near-infrared absorbing film of claim 1 ; and
an infrared blocking layer on one surface or both surfaces of the near-infrared absorbing film.

16. The optical filter of claim 15 , wherein
the infrared blocking layer including a first layer and a second layer containing materials having different refractive indexes, and
the infrared blocking layer is a multilayer where the first layer and the second layer are alternately and repeatedly stacked.

17. The optical filter of claim 15 , wherein the infrared blocking layer is configured to limit light in a wavelength region of about 700 nm to about 1200 nm.

18. The optical filter of claim 15 , wherein the near-infrared absorbing film has a thickness of about 50 μm to about 250 μm.

19. An electronic device comprising:
the optical filter of claim 15 .

20. The electronic device of claim 19 , wherein
the electronic device includes a lens and an image sensor, and
the optical filter is between the lens and the image sensor.

21. A near-infrared absorbing film, comprising
a polymer film; and
a near-infrared absorbing layer on the polymer film,
the near-infrared absorbing layer including a dye represented by Chemical Formula 1 and a copper phosphate compound,
the dye represented by Chemical Formula 1 being configured to transmit light in a visible region and to absorb light in a first part of a near-infrared region,
the copper phosphate compound being configured to absorb light in a second part of the near-infrared region,

wherein, in Chemical Formula 1,
R 1 , R 2 , and R 5 to R 12 are independently one of a hydrogen atom, a substituted or unsubstituted C1 to C20 alkyl group, or a substituted or unsubstituted C6 to C20 aryl group, and
R 3 and R 4 are independently one of an unsubstituted C6 to C20 aryl group or a C6 to C20 aryl group substituted with a C1 to C10 alkyl group.

22. The near-infrared absorbing film of claim 21 , wherein
the copper phosphate compound includes a structure represented by one of Chemical Formula 2-1 to Chemical Formula 2-3,

wherein, in Chemical Formula 2-1 to Chemical Formula 2-3,
R a to R h are independently one of a hydrogen atom or a substituted or unsubstituted C1 to C20 alkyl group.

23. The near-infrared absorbing film of claim 21 , wherein
the near-infrared absorbing layer further includes one of a cyanine-based dye, a phthalocyanine-based dye, a dithiolene metal complex dye, a diimmonium-based dye, or a combination thereof.

24. The near-infrared absorbing film of claim 21 , wherein
the near-infrared absorbing layer includes a first near-infrared absorbing layer and a second near-infrared absorbing layer,
the first near-infrared absorbing layer includes the dye represented by Chemical Formula 1,
the second near-infrared absorbing layer includes the copper phosphate compound,
the first near-infrared absorbing layer includes a binder,
the first near-infrared absorbing layer includes the dye represented by Chemical Formula in an amount that is in a range that is greater than 0 parts by weight and less than or equal to about 10 parts by weight based on 100 parts by weight of the binder.

25. An electronic device comprising:
an image sensor; and
the near-infrared absorbing film of claim 21 on the image sensor.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lee Yong Joo
• Kim Hyung Jun
• Won Jong Hoon
• Ko Yoon Seok
• Jung Myungsup

Classifications

• H10K39/32

  Organic image sensors · CPC title

• C08J7/042 Primary

  with two or more layers, where at least one layer of a composition contains a polymer binder · CPC title

• G02B5/223 Primary

  containing organic substances, e.g. dyes, inks or pigments · CPC title

• G02B5/208 Primary

  for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation · CPC title

• G02B5/003

  Light absorbing elements · CPC title