Low-angle-dependence violet zinc-sulfide structural color film and preparing method thereof

Abstract

The invention discloses a violet zinc-sulfide photonic crystal structural color film and a preparing method thereof, and belongs to the technical field of photonic crystal material preparing. The preparing method includes the steps that zinc sulfide microsphere nano-particles with uniform particle sizes are firstly prepared with a chemical homogeneous precipitation method, a short-range order film is prepared and then roasted in protection atmosphere to enable a trace of organic substances to be carbonized, and therefore the violet structural color film with evenly-distributed carbon black is obtained. The preparing method is simple, repeatability is high, the technical problems that chemical organic pigment is prone to fading and is harmful to the human body are solved, and meanwhile the problems that the requirements of opal structure photonic crystals for a substrate are high, and film coating conditions are strict are solved. The operating process is simple and practicable, large-scale industrial production can be achieved, the preparing method is suitable for building optically-variable-free structural color pigment on the surfaces of various materials, and the broad application prospects are achieved. The prepared violet zinc-sulfide photonic crystal structural color film is even in carbon black distribution, free of angle dependence, good in sphericity degree and uniform in particle size.

Description

technical field [0001] The invention belongs to the technical field of preparation of structural color materials, and in particular relates to a low-angle-dependent purple zinc sulfide structural color film and a preparation method thereof. Background technique [0002] Materials with high and low refractive indices are alternately arranged to form a periodic structure, that is, photonic crystals, through which light of a specific wavelength cannot pass through to generate photonic band gaps, thereby producing structural colors. Structural color is a kind of physical coloration, which has the advantages of bright color, never fading, environmental friendliness, and short preparation cycle. In recent years, through the ordered self-assembly method of colloidal microspheres, opal structure photonic crystals can be formed, and finally the light forms on the surface of photonic crystals with periodic structures through dry radiation, diffraction, scattering, etc., resulting in c...

AI Technical Summary

Problems solved by technology

In recent years, through the ordered self-assembly method of colloidal microspheres, opal structure photonic crystals can be formed, and finally the light forms on the surface of photonic crystals with periodic structures through dry radiation, diffraction, scattering, etc., resulting in colorful structural colors. However, because of the iridescent effect, that is, the colors observed in different directions are different, which greatly limits the application of structural color in wide viewing angle displays such as flat panel display, printing media, and optical equipment.

Some researchers have proposed that adding a small amount of black pigment to the short-range ordered structure can also improve the color saturation. Due to the isotropy of the short-range ordered structure, it can effectively reduce the dependence of the structural color on the angle, so that the structural color changes with the viewing angle. Keep the same effect (CN103173039A, 102702791A, 103788770A), but the disadvantage of the above method is that in the preparation of the photonic crystal structure color film, it is necessary to mix the powder with a small amount of carbon black or black pigment to form a film, the process is more complicated, and The opal structure has high requirements on the coating environment, and is greatly disturbed by the external environment. Small environmental fluctuations will have a great impact on the quality of the film, so it is difficult to be widely used

[0003] However, so far, no literature has reported on the preparation of such short-range ordered structure high-saturation institutional color thin films by using materials such as sulfides.

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