Image-forming material

1. An image-forming material, comprising a perimidine-based squarylium dye represented by the following Formula (I):

wherein, in Formula (I), R represents a hydrogen atom or a methyl group.

2. The image-forming material according to claim 1 , wherein the perimidine-based squarylium dye is a compound represented by Formula (I-a) and has diffraction peaks at least at 8.3°, 14.1°, 17.4°, 19.2°, 20.0°, 22.6° and 23.7° in terms of Bragg angle (2θ±0.2°) in a powder X-ray diffraction spectrum measured by irradiation with X-ray having a wavelength of 1.5405 Å using a Cu target, and is in a form of crystalline particles:

3. The image-forming material of claim 1 , wherein the perimidine-based squarylium dye is a compound represented by Formula (I-b) and has diffraction peaks at least at 7.7°, 11.2°, 15.4°, 16.6°, 18.2°, 19.8° and 25.8° in terms of Bragg angle (2θ±0.2°) in a powder X-ray diffraction spectrum measured by irradiation with X-ray having a wavelength of 1.5405 Å using a Cu target and is in a form of crystalline particles:

4. The image-forming material according to claim 1 , wherein the perimidine-based squarylium dye is in a form of crystalline particles having a median diameter, d50, of from about 10 nm to about 300 nm.

5. The image-forming material according to claim 1 , wherein the content of the perimidine-based squarylium dye is from about 0.05% by weight to about 3% by weight of the total weight of the image-forming material.

6. The image-forming material according to claim 1 , wherein the image-forming material is an electrophotographic toner.

7. The image-forming material according to claim 1 , wherein the image-forming material is an ink for inkjet printers.

8. The image-forming material according to claim 1 , further comprising a compound represented by the following Formula (V);

wherein, in Formula (V), R 1 to R 4 may be the same as or different from each other, and each independently represent a substituted or unsubstituted phenyl group; X 1 to X 4 may be the same as or different from each other, and each independently represent O, S, or Se; and Y represents a transition metal.

9. The image-forming material according to claim 1 , wherein the image-forming material satisfies conditions represented by the following Formulas (II) and (III):

0≦ΔE≦16  (II)

(100 −R )≧45  (III)

wherein, in Formula (II), ΔE represents a color difference according to the CIE 1976 L*a*b* color system and is represented by Formula (IV) shown below:

Δ E =√{square root over (( L 1 −L 2 ) 2 +( a 1 −a 2) 2 +( b 1 −b 2 ) 2 )}{square root over (( L 1 −L 2 ) 2 +( a 1 −a 2) 2 +( b 1 −b 2 ) 2 )}{square root over (( L 1 −L 2 ) 2 +( a 1 −a 2) 2 +( b 1 −b 2 ) 2 )}  (IV)

wherein, in Formula (IV), L 1 , a 1 and b 1 represent values of “L”, “a”, and “b” of a surface of a recording medium before image formation; and L 2 , a 2 and b 2 represent values of “L”, “a” and “b” of an image area when a fixed image formed by the image-forming material with an application amount of 4 g/m 2 is formed on the surface of the recording medium; and

wherein, in Formula (III), R (unit: %) represents infrared reflectance of the image area at a wavelength of 850 nm.